474417-78-2Relevant articles and documents
Practical synthesis of Boc-protected cis-4-trifluoromethyl and cis-4-difluoromethyl-L- prolines
Qiu, Xiao-long,Qing, Feng-ling
, p. 7162 - 7164 (2007/10/03)
A short, efficient, and diastereomerically pure synthesis of N-Boc-cis-4-trifluoromethyl-L-proline (7) and N-Boc-cis-4-difluoromethyl-L-proline (9) from N-Boc-4-oxo- L-proline (4) is described. The reaction of 4 with Me3SiCF3 and the conversion of the carbonyl group of 4 into the difluoromethylene group are the key steps for the synthesis of 7 and 9, respectively.