2,2,2-Trifluoroethylhydrazine → (2S,4R)-4-Cyclopropylmethanesulfonyl-1-[5-methyl-2-(2,2,2-trifluoro-ethyl)-2H-pyrazol-3-yl]-pyrrolidine-2-carboxylic Acid Methyl Ester

Participants

Reaction Steps

In analogy to the procedure described in example 192 h, (2S,4R)-4-cyclopropylmethanesulfonyl-1-(3-oxo-thiobutyryl)-pyrrolidine-2-carboxylic acid methyl ester (example 445c) was reacted with 2,2,2-trifluoroethylhydrazine (CAS Reg. No. 5042-30-8) to give the title compound as brown solid. MS (ESI): m/z=409.9 [M+H]+.

Provenance & Evidence