(S,R)-1-(2-tert-butoxycarbonylamino-2-phenylacetyl)-pyrrolidine-2-carboxylic acid → (S,R)-{2-[2-(2-bromo-imidazo[2,1-b]thiazol-6-ylcarbamoyl)-pyrrolidin-1-yl]-2-oxo-1-phenylethyl}-carbamic acid ethyl ester

Participants

Reaction Steps

Compound 44 was synthesized from compounds 43 (0.377 mmol) and 11 (0.565 mmol), following the procedure as described for compound 12a, at room temperature overnight, to give compound 44 as a yellow oil in 66% yield. 1H NMR (DMSO-d6, 400 MHz) δ (ppm) 1.10 (t, 3H), 1.80 (m, 2H), 1.95 (m, 2H), 3.10 (m, 1H), 3.81 (m, 1H), 3.99 (m, 2H), 4.40 (m, 1H), 5.42 (m, 1H), 7.31 (m, 5H), 7.50 (d, 1H), 7.81 (s, 1H), 8.16 (s, 1H), 10.61 (s, 1H); MS (ESI, EI+) m/z=520-522 (MH+).

Provenance & Evidence