Trifluoroacetic acid → (R)-2,5-dihydro-1H-pyrrole-2-carboxylic acid ethyl ester trifluoroacetate

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Reaction Steps

(1:1) 1.5 g (0.006 mol) (R)-2,5-dihydro-pyrrole-1,2-dicarboxylic acid 1-tert-butyl ester 2-ethyl ester were dissolved at 5° C. in 10 ml trifluoroacetic acid and stirring was continued at room temperature for 3 hours. Evaporation of the solvent in vacuo gave 2.05 g (quant.) of (R)-2,5-dihydro-1H-pyrrole-2-carboxylic acid ethyl ester trifluoroacetate (1:1) as a yellow oil. MS m/e (%): 142 (1), 68 (100), 45 (10), 41 (15). [α]D=+95.4° (c=1% in methanol).

Provenance & Evidence