2,2-DIMETHYL-4(R)-4-IODOMETHYL-1,3-DIOXALANE

Conditions: temp:90.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of (2,2-dimethyl-1,3-dioxolan-4-yl)methanol (10 g, 75.67 mmol) in dry toluene (200 mL) was added triphenylphospine (23.82 g, 90.81 mmol), imidazole (15.45 g, 227 mmol), and iodine (24.97 g, 98.36 mmol). The mixture was stirred at 90° C. for 3 h. The solvent was then removed in vacuo and the residue was dissolved in DCM (200 mL) and washed with saturated Na2S2O3 solution water and brine. The organic layer was dried over MgSO4, filtered and concentrated in vacuo. The crude compound was purified on column of silica gel (DCM) to give the subject compound (15.79 g, yield 86%). Intermediate 12 was characterized by the following spectroscopic data: 1H NMR (CDCl3-d1, 300 MHz) δ (ppm) 4.33 (m, 1H), 4.19 (m, 1H), 3.82 (m, 1H), 3.32 (m, 1H), 3.27 (m, 1H), 1.49 (s, 3H), 1.38 (s, 3H). The solvent was then removed in vacuo the residue was dissolved in DCM (200 mL) washed with saturated Na2S2O3 solution water and brine The organic layer was dried over MgSO4 filtered concentrated in vacuo The crude compound was purified on column of silica gel (DCM)

Conditions: temp:90.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of (2,2-dimethyl-1,3-dioxolan-4-yl)methanol (10 g, 75.67 mmol) in dry toluene (200 mL) was added triphenylphospine (23.82 g, 90.81 mmol), imidazole (15.45 g, 227 mmol), and iodine (24.97 g, 98.36 mmol). The mixture was stirred at 90° C. for 3 h. The solvent was then removed in vacuo and the residue was dissolved in DCM (200 mL) and washed with saturated Na2S2O3 solution water and brine. The organic layer was dried over MgSO4, filtered and concentrated in vacuo. The crude compound was purified on column of silica gel (DCM) to give the subject compound (15.79 g, yield 86%). Intermediate 12 was characterized by the following spectroscopic data: 1H NMR (CDCl3-d1, 300 MHz) δ (ppm) 4.33 (m, 1H), 4.19 (m, 1H), 3.82 (m, 1H), 3.32 (m, 1H), 3.27 (m, 1H), 1.49 (s, 3H), 1.38 (s, 3H). The solvent was then removed in vacuo the residue was dissolved in DCM (200 mL) washed with saturated Na2S2O3 solution water and brine The organic layer was dried over MgSO4 filtered concentrated in vacuo The crude compound was purified on column of silica gel (DCM)