Asymmetric organocatalytic mannich reaction of 1-aryl-2,2,2-trifluoroethylidenecarbamic acid derivatives with acetone
摘要:
Mannich reactions of ethyl 1-aryl-2,2,2-trifluoroethylidenecarbamates and ureas with acetone in the presence of L-proline gave 1-aryl-3-oxo-1-(trifluoromethyl)butylcarbamates and ureas with an enantiomeric excess of 24-54%.