1,2-Pyrrolidinedicarboxylic acid, 1-(1,1-dimethylethyl) ester, (2S)- → HCID 57311781, compound

Participants

Reaction Steps

Using the procedure of Step A of Example 7, a solution of 16.14 ml of BOC-L-proline in 150 ml of methylene chloride, 20.6 ml of N-methyl-morpholine, 19.5 ml of isobutyl chloroformate in 75 ml of methylene chloride and 15.4 g of 2-amino-3-trifluoromethylbenzoic acid in 150 ml of methylene chloride and 8.3 ml of N-methyl-morpholine were reacted for 20 hours. The mixture was extracted with methylene chloride and the residue was chromatographed on silica gel and was eluted with methylene chloride to obtain 16.4 g of 1,1-dimethylethyl (2S) 2-[4-oxo-8-(trifluoromethyl)-4H-3,1-benzoxazin-2-yl]-1-pyrrolidine carboxylate having a specific rotation of [α]D =-75°±2.5° (c=0.6% in CH3COOH).

Provenance & Evidence