反应详情

A stirred solution of 4-(4-nitro-phenyl)-pyrrolidine-3-carboxylic acid ethyl ester (7.5 g, Reference Example 4) in methylene chloride (100 ml), at 23° C., was treated dropwise with triethylamine (5.8 ml). After stirring for 15 minutes the mixture was treated dropwise with a solution of benzoyl chloride [prepared in a separate vessel by treating a stirred solution of benzoic acid (5 g) in methylene chloride (15 ml), at 23° C., with oxalyl chloride (5 ml) and after stirring for 2 hours evaporating the reaction mixture] in methylene chloride (3.5 ml). The resulting dark brown mixture was stirred for 1.5 hours at 23° C. then filtered. The filtrate was successively washed with water (100 ml), then twice with hydrochloric acid (100 ml, 1N), then with brine (100 ml), then water (100 ml), then dried over magnesium sulphate and then evaporated (40° C. and 2.7 kPa) affording the title compound (10 g) as a viscous oil. 1H-NMR [400 MHz, (CD3)2SO at 383° K.] δ 1.13 (t, J=7 Hz, 3H); 3.49 (m, 1H); 3.65 (m, 1H); 3.75 to 3.90 (m, 2H); 3.90 to 4.20 (m, 2H); 4.09 (m, 2H);7.40 to 7.65 (m, 5H); 7.66 (d, J=8.5 Hz, 2H); 8.19 (d, J=8.5 Hz, 2H). MS [DCI (reactant gas, ammonia)]: 369[M+H]+, 386[M+NH4]+.

1. customprepared in a separate vessel
2. customevaporating the reaction mixture] in methylene chloride (3.5 ml)
3. stirringThe resulting dark brown mixture was stirred for 1.5 hours at 23° C.
4. filtrationthen filtered
5. washThe filtrate was successively washed with water (100 ml)
6. dry with materialtwice with hydrochloric acid (100 ml, 1N), then with brine (100 ml), then water (100 ml), then dried over magnesium sulphate
7. customevaporated (40° C. and 2.7 kPa)