1-isothiocyanato-2-methylpropane

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

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

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

Procedure: The title compound was synthesized according to the method described by Graybill et al. Tetrahedron lett. 2002 43, 5305-5309 from furan-2-carboxylic acid hydrazide (55.2 mg, 0.44 mmol), 1-isothiocyanato-2-methyl-propane (47 ml, 0.38 mmol) and 3-chloromethyl-5-(3-chloro-phenyl)-[1,2,4]oxadiazole (45.0 mg, 0.20 mmol) with P-BEMP (136 mg, 0.30 mmol) as base. Purification by flash chromatography (33-66% EtOAc in heptane) gave the product as an oil (12.7 mg, 15.6%). 1H NMR (CDCl3) d (ppm): 8.08 (s, 1H), 7.97 (d, 1H), 7.55 (d, 2H), 7.45 (t, 1H), 7.10 (d, 1H), 6.56 (d, 1H), 4.62 (s, 2H), 4.01 (d, 2H), 2.03 (m, 1H), 0.86 (d, 6H). Purification by flash chromatography (33-66% EtOAc in heptane)

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

Procedure: The title compound was synthesized according to the method described by Graybill et al. Tetrahedron lett. 2002 43, 5305-5309 from furan-2-carboxylic acid hydrazide (55.2 mg, 0.44 mmol), 1-isothiocyanato-2-methyl-propane (47 ml, 0.38 mmol) and 3-chloromethyl-5-(3-chloro-phenyl)-[1,2,4]oxadiazole (45.0 mg, 0.20 mmol) with P-BEMP (136 mg, 0.30 mmol) as base. Purification by flash chromatography (33-66% EtOAc in heptane) gave the product as an oil (12.7 mg, 15.6%). 1H NMR (CDCl3) d (ppm): 8.08 (s, 1H), 7.97 (d, 1H), 7.55 (d, 2H), 7.45 (t, 1H), 7.10 (d, 1H), 6.56 (d, 1H), 4.62 (s, 2H), 4.01 (d, 2H), 2.03 (m, 1H), 0.86 (d, 6H). Purification by flash chromatography (33-66% EtOAc in heptane)

Conditions: temp:150.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 2-amino-4-chlorobenzenesulfonamide (5.0 g, 24.18 mmol) and isobutyl isothiocyanate (10 ml, 83.6 mmol) was heated at 150° C. for 3 h. The mixture was allowed to cool and then stirred with 50 ml of ethyl acetate for 30 min. The precipitate was isolated by filtration and recrystallised from ethanol to give 2.9 g (42%) of the pure title compound; m.p. 298-301° C.; 1H-NMR (DMSO-d6): δ 0.91 (d, 6H, CH(CH3)2), 1.83 (m, 1H, CH(CH3)2), 3.05 (t, 2H, CH2), 7.2-7.4 (m, 3H, ArH+NH), 7.67 (d, 1H, ArH), 10.5 (br.s, 1H, NH); MS: m/e 287/289 (M+); (C11H14N3Cl1O2S1) calc. C, 45.91; H, 4.90; N, 14.60; found C, 45.90; H, 5.04; N, 14.66. to cool The precipitate was isolated by filtration recrystallised from ethanol

Conditions: temp:150.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 2-amino-4-chlorobenzenesulfonamide (5.0 g, 24.18 mmol) and isobutyl isothiocyanate (10 ml, 83.6 mmol) was heated at 150° C. for 3 h. The mixture was allowed to cool and then stirred with 50 ml of ethyl acetate for 30 min. The precipitate was isolated by filtration and recrystallised from ethanol to give 2.9 g (42%) of the pure title compound; m.p. 298-301° C.; 1H-NMR (DMSO-d6): δ 0.91 (d, 6H, CH(CH3)2), 1.83 (m, 1H, CH(CH3)2), 3.05 (t, 2H, CH2), 7.2-7.4 (m, 3H, ArH+NH), 7.67 (d, 1H, ArH), 10.5 (br.s, 1H, NH); MS: m/e 287/289 (M+); (C11H14N3Cl1O2S1) calc. C, 45.91; H, 4.90; N, 14.60; found C, 45.90; H, 5.04; N, 14.66. to cool The precipitate was isolated by filtration recrystallised from ethanol

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

Procedure: Methylamine (2M in methanol, 20.0 mL, 40.2 mmol) was added dropwise to isobutylisothiocyanate (2.00 mL, 16.5 mmol) during 15 minutes at room temperature. The reaction mixture was heated to reflux for 3.5 h and the solvent was evaporated off to give the title compound (2.37 g, 98%) as a colourless oil. The reaction mixture was heated to reflux for 3.5 h the solvent was evaporated off

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

Procedure: The title compound was prepared by the procedure described in Example 19 using 9.2 g of N-ethyl glycine, 5.7 g of isobutyl-isothiocyanate, 10.1 g of triethylamine, and 150 mL of methylene chloride. Purification was achieved by flash chromatography on silica gel (methylene chloride). Title compound (2.3 g) was obtained as an oil. Anal. Calcd. for. C9H16N2O S: C, 53.97; H, 8.05; N, 13.99. Found: C, 54.01; H, 8.21; N, 14.00) Mass spectrum (El, M.+) m/z 200. The title compound was prepared by the procedure Purification

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

Procedure: The title compound was prepared by the procedure described in Example 19 using 9.2 g of N-ethyl glycine, 5.7 g of isobutyl-isothiocyanate, 10.1 g of triethylamine, and 150 mL of methylene chloride. Purification was achieved by flash chromatography on silica gel (methylene chloride). Title compound (2.3 g) was obtained as an oil. Anal. Calcd. for. C9H16N2O S: C, 53.97; H, 8.05; N, 13.99. Found: C, 54.01; H, 8.21; N, 14.00) Mass spectrum (El, M.+) m/z 200. The title compound was prepared by the procedure Purification

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

Procedure: The title compound was synthesized according to the method described by Graybill et al. Tetrahedron lett. 2002 43, 5305-5309 from furan-2-carboxylic acid hydrazide (55.2 mg, 0.44 mmol), 1-isothiocyanato-2-methyl-propane (47 ml, 0.38 mmol) and 3-chloromethyl-5-(3-chloro-phenyl)-[1,2,4]oxadiazole (45.0 mg, 0.20 mmol) with P-BEMP (136 mg, 0.30 mmol) as base. Purification by flash chromatography (33-66% EtOAc in heptane) gave the product as an oil (12.7 mg, 15.6%). 1H NMR (CDCl3) d (ppm): 8.08 (s, 1 H), 7.97 (d, 1H), 7.55 (d, 2H), 7.45 (t, 1H), 7.10 (d, 1H), 6.56 (d, 1H), 4.62 (s, 2H), 4.01 (d, 2H), 2.03 (m, 1H), 0.86 (d, 6H). Purification by flash chromatography (33-66% EtOAc in heptane)

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

Procedure: The title compound was synthesized according to the method described by Graybill et al. Tetrahedron lett. 2002 43, 5305-5309 from furan-2-carboxylic acid hydrazide (55.2 mg, 0.44 mmol), 1-isothiocyanato-2-methyl-propane (47 ml, 0.38 mmol) and 3-chloromethyl-5-(3-chloro-phenyl)-[1,2,4]oxadiazole (45.0 mg, 0.20 mmol) with P-BEMP (136 mg, 0.30 mmol) as base. Purification by flash chromatography (33-66% EtOAc in heptane) gave the product as an oil (12.7 mg, 15.6%). 1H NMR (CDCl3) d (ppm): 8.08 (s, 1 H), 7.97 (d, 1H), 7.55 (d, 2H), 7.45 (t, 1H), 7.10 (d, 1H), 6.56 (d, 1H), 4.62 (s, 2H), 4.01 (d, 2H), 2.03 (m, 1H), 0.86 (d, 6H). Purification by flash chromatography (33-66% EtOAc in heptane)

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

Procedure: A mixture of 22 parts of 2-(4-methoxyphenyl)-1,3-dioxolane-2-methanamine hydrochloride, 11.5 parts of 1-isothiocyanato-2-methylpropane, 20.7 parts of potassium carbonate and 200 parts of 2-propanol is stirred and refluxed for 3 hours. The reaction mixture is filtered while hot and the filtrate is evaporated. The solid residue is crystallized from a mixture of benzene and petroleumether. The product is filtered off and dried, yielding 26 parts (89.65%) of N-[2-(4-methoxyphenyl)-1,3-dioxolan-2-ylmethyl]-N'-(2-methylpropyl)thiourea; mp. 96° C. refluxed for 3 hours The reaction mixture is filtered while hot and the filtrate is evaporated The solid residue is crystallized from a mixture of benzene and petroleumether The product is filtered off dried