butyl cyclopentanecarboxylate

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Compound 103f was prepared, likewise the procedure described for 103b, starting from butyl cyclopentanecarboxylate (40.2 g, 0.236 mol), 1,5-dibromopentane (64 mL, 0.45 mol) and LDA (2 M in THF/heptane/ethylbenzene, 200 mL, 0.40 mol) to give, after purification by fractional distillation under reduced pressure, 3f (49.1 g, 93% pure by GC, 61%) as a bright yellow liquid. bp: T=123° C. (p=0.001 Torr). 1H NMR: δ 4.06 (t, J=6.6 Hz, 2H), 3.38 (t, J=6.9 Hz, 2H), 2.15-2.07 (m, 2H), 1.89-1.79 (quintet, J=7.1 Hz, 2H), 1.69-1.56 (m, 8H), 1.49-1.32 (m, 6H), 1.28-1.17 (m, 2H), 0.94 (t, J=7.4 Hz, 3H). 13C NMR: δ 177.7, 64.0, 54.0, 39.0, 36.0 (2×), 33.6, 32.5, 30.7, 28.5, 25.1, 24.8 (2×), 19.1, 13.6. HRMS calcd for C15H27BrO2 (M+): 318.1195, found: 318.1192. to give after purification by fractional distillation under reduced pressure, 3f (49.1 g, 93% pure by GC, 61%) as a bright yellow liquid T=123° C. (p=0.001 Torr)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Compound 103c was prepared, likewise the procedure described for 103b, starting from butyl cyclopentanecarboxylate (Payne, G. B. et al. J. Org. Chem., 1957, 22, 1680-1682) (80.0 g, 0.42 mol), 1,4-dibromobutane (183.3 g, 0.84 mol) and LDA (2 M in THF/heptane/ethylbenzene, 250 mL, 0.50 mol) to give, after purification by fractional distillation under reduced pressure, 103c (62.8 g, 49%) as a light yellow liquid. bp: T=116-117° C. (p=0.040-0.051 Torr). 1H NMR: δ 4.07 (t, J=6.6 Hz, 2H), 3.38 (t, J=6.8 Hz, 2H), 2.16-2.10 (m, 2H), 1.83 (quintet, J=7.1 Hz, 2H), 1.65-1.59 (m, 8H), 1.50-1.31 (m, 6H), 0.94 (t, J=7.2 Hz, 3H). 13C NMR: δ 177.6, 64.1, 53.9, 38.2, 36.0 (2×), 33.3, 33.0, 30.6, 24.8 (2×), 24.6, 19.1, 13.6. HRMS calcd for C14H25BrO2 (M+): 304.1038, found: 304.1042. to give after purification by fractional distillation under reduced pressure, 103c (62.8 g, 49%) as a light yellow liquid T=116-117° C. (p=0.040-0.051 Torr)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Compound 103f was prepared, likewise the procedure described for 103b, starting from butyl cyclopentanecarboxylate (40.2 g, 0.236 mol), 1,5-dibromopentane (64 mL, 0.45 mol) and LDA (2 M in THF/heptane/ethylbenzene, 200 mL, 0.40 mol) to give, after purification by fractional distillation under reduced pressure, 3f (49.1 g, 93% pure by GC, 61%) as a bright yellow liquid. bp: T=123° C. (p=0.001 Torr). 1H NMR: δ 4.06 (t, J=6.6 Hz, 2H), 3.38 (t, J=6.9 Hz, 2H), 2.15-2.07 (m, 2H), 1.89-1.79 (quintet, J=7.1 Hz, 2H), 1.69-1.56 (m, 8H), 1.49-1.32 (m, 6H), 1.28-1.17 (m, 2H), 0.94 (t, J=7.4 Hz, 3H). 13C NMR: δ 177.7, 64.0, 54.0, 39.0, 36.0 (2×), 33.6, 32.5, 30.7, 28.5, 25.1, 24.8 (2×), 19.1, 13.6. HRMS calcd for C15H27BrO2 (M+): 318.1195, found: 318.1192. to give after purification by fractional distillation under reduced pressure, 3f (49.1 g, 93% pure by GC, 61%) as a bright yellow liquid T=123° C. (p=0.001 Torr)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Compound 103c was prepared, likewise the procedure described for 103b, starting from butyl cyclopentanecarboxylate (Payne, G. B. et al. J. Org. Chem., 1957, 22, 1680-1682) (80.0 g, 0.42 mol), 1,4-dibromobutane (183.3 g, 0.84 mol) and LDA (2 M in THF/heptane/ethylbenzene, 250 mL, 0.50 mol) to give, after purification by fractional distillation under reduced pressure, 103c (62.8 g, 49%) as a light yellow liquid. bp: T=116-117° C. (p=0.040-0.051 Torr). 1H NMR: δ 4.07 (t, J=6.6 Hz, 2H), 3.38 (t, J=6.8 Hz, 2H), 2.16-2.10 (m, 2H), 1.83 (quintet, J=7.1 Hz, 2H), 1.65-1.59 (m, 8H), 1.50-1.31 (m, 6H), 0.94 (t, J=7.2 Hz, 3H). 13C NMR: δ 177.6, 64.1, 53.9, 38.2, 36.0 (2×), 33.3, 33.0, 30.6, 24.8 (2×), 24.6, 19.1, 13.6. HRMS calcd for C14H25BrO2 (M+): 304.1038, found: 304.1042. to give after purification by fractional distillation under reduced pressure, 103c (62.8 g, 49%) as a light yellow liquid T=116-117° C. (p=0.040-0.051 Torr)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Compound 103c was prepared, likewise the procedure described for 103b, starting from butyl cyclopentanecarboxylate (Payne, G. B. et al. J. Org. Chem., 1957, 22, 1680-1682) (80.0 g, 0.42 mol), 1,4-dibromobutane (183.3 g, 0.84 mol) and LDA (2 M in THF/heptane/ethylbenzene, 250 mL, 0.50 mol) to give, after purification by fractional distillation under reduced pressure, 103c (62.8 g, 49%) as a light yellow liquid. bp: T=116-117° C. (p=0.040-0.051 Torr). 1H NMR: δ 4.07 (t, J=6.6 Hz, 2H), 3.38 (t, J=6.8 Hz, 2H), 2.16-2.10 (m, 2H), 1.83 (quintet, J=7.1 Hz, 2H), 1.65-1.59 (m, 8H), 1.50-1.31 (m, 6H), 0.94 (t, J=7.2 Hz, 3H). 13C NMR: δ 177.6, 64.1, 53.9, 38.2, 36.0 (2×), 33.3, 33.0, 30.6, 24.8 (2×), 24.6, 19.1, 13.6. HRMS calcd for C14H25BrO2 (M+): 304.1038, found: 304.1042. to give after purification by fractional distillation under reduced pressure, 103c (62.8 g, 49%) as a light yellow liquid T=116-117° C. (p=0.040-0.051 Torr)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Compound 103f was prepared, likewise the procedure described for 103b, starting from butyl cyclopentanecarboxylate (40.2 g, 0.236 mol), 1,5-dibromopentane (64 mL, 0.45 mol) and LDA (2 M in THF/heptane/ethylbenzene, 200 mL, 0.40 mol) to give, after purification by fractional distillation under reduced pressure, 3f (49.1 g, 93% pure by GC, 61%) as a bright yellow liquid. bp: T=123° C. (p=0.001 Torr). 1H NMR: δ 4.06 (t, J=6.6 Hz, 2H), 3.38 (t, J=6.9 Hz, 2H), 2.15-2.07 (m, 2H), 1.89-1.79 (quintet, J=7.1 Hz, 2H), 1.69-1.56 (m, 8H), 1.49-1.32 (m, 6H), 1.28-1.17 (m, 2H), 0.94 (t, J=7.4 Hz, 3H). 13C NMR: δ 177.7, 64.0, 54.0, 39.0, 36.0 (2×), 33.6, 32.5, 30.7, 28.5, 25.1, 24.8 (2×), 19.1, 13.6. HRMS calcd for C15H27BrO2 (M+): 318.1195, found: 318.1192. to give after purification by fractional distillation under reduced pressure, 3f (49.1 g, 93% pure by GC, 61%) as a bright yellow liquid T=123° C. (p=0.001 Torr)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Compound 103c was prepared, likewise the procedure described for 103b, starting from butyl cyclopentanecarboxylate (Payne, G. B. et al. J. Org. Chem., 1957, 22, 1680-1682) (80.0 g, 0.42 mol), 1,4-dibromobutane (183.3 g, 0.84 mol) and LDA (2 M in THF/heptane/ethylbenzene, 250 mL, 0.50 mol) to give, after purification by fractional distillation under reduced pressure, 103c (62.8 g, 49%) as a light yellow liquid. bp: T=116-117° C. (p=0.040-0.051 Torr). 1H NMR: δ 4.07 (t, J=6.6 Hz, 2H), 3.38 (t, J=6.8 Hz, 2H), 2.16-2.10 (m, 2H), 1.83 (quintet, J=7.1 Hz, 2H), 1.65-1.59 (m, 8H), 1.50-1.31 (m, 6H), 0.94 (t, J=7.2 Hz, 3H). 13C NMR: δ 177.6, 64.1, 53.9, 38.2, 36.0 (2×), 33.3, 33.0, 30.6, 24.8 (2×), 24.6, 19.1, 13.6. HRMS calcd for C14H25BrO2 (M+): 304.1038, found: 304.1042. to give after purification by fractional distillation under reduced pressure, 103c (62.8 g, 49%) as a light yellow liquid T=116-117° C. (p=0.040-0.051 Torr)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Compound 103c was prepared, likewise the procedure described for 103b, starting from butyl cyclopentanecarboxylate (Payne, G. B. et al. J. Org. Chem., 1957, 22, 1680-1682) (80.0 g, 0.42 mol), 1,4-dibromobutane (183.3 g, 0.84 mol) and LDA (2 M in THF/heptane/ethylbenzene, 250 mL, 0.50 mol) to give, after purification by fractional distillation under reduced pressure, 103c (62.8 g, 49%) as a light yellow liquid. bp: T=116-117° C. (p=0.040-0.051 Torr). 1H NMR: δ 4.07 (t, J=6.6 Hz, 2H), 3.38 (t, J=6.8 Hz, 2H), 2.16-2.10 (m, 2H), 1.83 (quintet, J=7.1 Hz, 2H), 1.65-1.59 (m, 8H), 1.50-1.31 (m, 6H), 0.94 (t, J=7.2 Hz, 3H). 13C NMR: δ 177.6, 64.1, 53.9, 38.2, 36.0 (2×), 33.3, 33.0, 30.6, 24.8 (2×), 24.6, 19.1, 13.6. HRMS calcd for C14H25BrO2 (M+): 304.1038, found: 304.1042. to give after purification by fractional distillation under reduced pressure, 103c (62.8 g, 49%) as a light yellow liquid T=116-117° C. (p=0.040-0.051 Torr)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Under a N2 atmosphere at −60° C., a solution of butyl cyclopentanecarboxylate (prepared according to Payne, G. B.; Smith, C. W., J. Org. Chem., 1957, 22, 1680-1682, 40.2 g, 0.236 mol) and 1,5-dibromopentane (64 mL, 0.45 mol) in dry THF (400 mL) was added drop wise to a solution of LDA (2M in THF/heptane/ethylbenzene, 200 mL, 0.40 mol) in 30 min. After 3 h, the reaction mixture was allowed to reach rt in 30 min. Then the reaction mixture was poured out into ice-cold saturated aqueous NH4Cl (1 L). The organic layer was decanted and concentrated in vacuo to a smaller volume. The aqueous layer was extracted with Et2O (3×150 mL). The combined organic layers were washed with saturated aqueous NH4Cl (3×150 mL), brine (150 mL), dried (Na2SO4) and evaporated in vacuo. The remaining residue was purified by fractional distillation to give butyl 1-(5-bromo-pentyl)-cyclopentanecarboxylate (49.1 g, >90% pure by GC, 59%) as a bright yellow liquid. bp: T=123° C. (p=0.001 Torr). 1H NMR (CDCl3): δ=4.06 (t, J=6.6 Hz, 2H), 3.38 (t, J=6.9 Hz, 2H), 2.15-2.07 (m, 2H), 1.89-1.79 (quintet, J=7.1 Hz, 2H), 1.69-1.56 (m, 8H), 1.49-1.32 (m, 6H), 1.28-1.17 (m, 2H), 0.94 (t, J=7.4 Hz, 3H). 13C NMR (CDCl3): δ=177.7, 64.0, 54.0, 39.0, 36.0 (2×), 33.6, 32.5, 30.7, 28.5, 25.1, 24.8 (2×), 19.1, 13.6. HRMS calcd for C15H27BrO2 (M+): 318.1195, found: 318.1192. to reach rt in 30 min The organic layer was decanted concentrated in vacuo to a smaller volume The aqueous layer was extracted with Et2O (3×150 mL) The combined organic layers were washed with saturated aqueous NH4Cl (3×150 mL), brine (150 mL) dried (Na2SO4) evaporated in vacuo The remaining residue was purified by fractional distillation

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Under a N2 atmosphere at −60° C., a solution of butyl cyclopentanecarboxylate (prepared according to Payne, G. B.; Smith, C. W., J. Org. Chem., 1957, 22, 1680-1682, 80.0 g, 0.42 mol) and 1,4-dibromobutane (183.3 g, 0.84 mol) in dry THF (700 mL) was added drop wise to a mixture of LDA (2M in THF/heptane/ethylbenzene, 250 mL, 0.50 mol) and dry THF (250 mL) in 1.5 h. After that, the reaction mixture was allowed to slowly reach rt during 3.5 h. Then, the reaction mixture was poured into ice-cold saturated aqueous NH4Cl (1 L). The organic layer was decanted and concentrated in vacuo to a smaller volume. The aqueous layer was extracted with Et2O (3×250 mL). The combined organic layers were washed with saturated aqueous NH4Cl (250 mL) and brine (2×250 mL), dried (Na2SO4) and evaporated in vacuo. The remaining residue was purified by fractional distillation to give butyl 1-(4-bromo-butyl)-cyclopentanecarboxylate (62.8 g, 49%) as a light yellow liquid. bp: T=116-117° C. (p=0.040-0.051 Torr). 1H NMR (CDCl3): δ=4.07 (t, J=6.6 Hz, 2H), 3.38 (t, J=6.8 Hz, 2H), 2.16-2.10 (m, 2H), 1.83 (quintet, J=7.1 Hz, 2H), 1.65-1.59 (m, 8H), 1.50-1.31 (m, 6H), 0.94 (t, J=7.2 Hz, 3H). 13C NMR (CDCl3): δ=177.6, 64.1, 53.9, 38.2, 36.0 (2×), 33.3, 33.0, 30.6, 24.8 (2×), 24.6, 19.1, 13.6. HRMS calcd for C14H25BrO2 (M+): 304.1038, found: 304.1042. The organic layer was decanted concentrated in vacuo to a smaller volume The aqueous layer was extracted with Et2O (3×250 mL) The combined organic layers were washed with saturated aqueous NH4Cl (250 mL) and brine (2×250 mL) dried (Na2SO4) evaporated in vacuo The remaining residue was purified by fractional distillation

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Under a N2 atmosphere at −60° C., a solution of butyl cyclopentanecarboxylate (prepared according to Payne, G. B.; Smith, C. W., J. Org. Chem., 1957, 22, 1680-1682, 80.0 g, 0.42 mol) and 1,4-dibromobutane (183.3 g, 0.84 mol) in dry THF (700 mL) was added drop wise to a mixture of LDA (2M in THF/heptane/ethylbenzene, 250 mL, 0.50 mol) and dry THF (250 mL) in 1.5 h. After that, the reaction mixture was allowed to slowly reach rt during 3.5 h. Then, the reaction mixture was poured into ice-cold saturated aqueous NH4Cl (1 L). The organic layer was decanted and concentrated in vacuo to a smaller volume. The aqueous layer was extracted with Et2O (3×250 mL). The combined organic layers were washed with saturated aqueous NH4Cl (250 mL) and brine (2×250 mL), dried (Na2SO4) and evaporated in vacuo. The remaining residue was purified by fractional distillation to give butyl 1-(4-bromo-butyl)-cyclopentanecarboxylate (62.8 g, 49%) as a light yellow liquid. bp: T=116-117° C. (p=0.040-0.051 Torr). 1H NMR (CDCl3): δ=4.07 (t, J=6.6 Hz, 2H), 3.38 (t, J=6.8 Hz, 2H), 2.16-2.10 (m, 2H), 1.83 (quintet, J=7.1 Hz, 2H), 1.65-1.59 (m, 8H), 1.50-1.31 (m, 6H), 0.94 (t, J=7.2 Hz, 3H). 13C NMR (CDCl3): δ=177.6, 64.1, 53.9, 38.2, 36.0 (2×), 33.3, 33.0, 30.6, 24.8 (2×), 24.6, 19.1, 13.6. HRMS calcd for C14H25BrO2 (M+): 304.1038, found: 304.1042. The organic layer was decanted concentrated in vacuo to a smaller volume The aqueous layer was extracted with Et2O (3×250 mL) The combined organic layers were washed with saturated aqueous NH4Cl (250 mL) and brine (2×250 mL) dried (Na2SO4) evaporated in vacuo The remaining residue was purified by fractional distillation