(S,E)-tert-butyl 3-(3-(2-(tert-butoxycarbonylamino)butanamido)prop-1-enyl)-1H-indole-1-carboxylate → 3-[3-(2-(S)-tert-butoxycarbonylamino-butyrylamino)-propyl]-indole-1-carboxylic acid tert-butyl ester

Participants

Reaction Steps

A 250 mL Parr hydrogenation vessel was charged with (S,E)-tert-butyl 3-(3-(2-(tert-butoxycarbonylamino)butanamido)prop-1-enyl)-1H-indole-1-carboxylate (280 mg, 0.42 mmol), 10% palladium on carbon (34 mg), and ethanol (6.0 mL). The vessel was evacuated and filled with hydrogen. This was repeated two more times. The vessel was then filled with 50 psi hydrogen. After 24 h, the resulting solution was filtered through CELITE and the filtrate concentrated in vacuo to yield 3-[3-(2-(S)-tert-butoxycarbonylamino-butyrylamino)-propyl]indole-1-carboxylic acid tert-butyl ester. 1H NMR (300 MHz, CDCl3) δ 7.21-7.24 (m, 1H), 7.07-7.12 (m, 1H), 6.64-6.71 (m, 1H), 6.42-6.46 (m, 1H), 4.38-4.45 (m, 1H), 3.39-3.53 (m, 2H), 2.53 (t, J=6.8 Hz, 2H), 1.67-1.96 (m, 4H), and 0.88-0.93 (m, 3H).

Provenance & Evidence