Triethylamine → (2S,3R)-3-Allyl-4-oxo-1-(1-phenyl-propylcarbamoyl)-azetidine-2-carboxylic acid 4-methoxy-benzyl ester

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Reaction Steps

A mixture of compound 59 (41 mg, 0.15 mmol), triethylamine (83 uL, 0.60 mmol), α-ethyl-benzyl isocyanate (29 mg, 0.18 mmol) in methylene chloride (1.2 mL) was stirred overnight. TLC analysis indicated the completion the reaction. Removal of solvents gave the crude material, which was purified by preparative TLC plate (15% EtOAc in hexanes), yielding 38.2 mg of compound 60 (59%): LC-MS purity: 98.1%; 1HNMR (300 MHz, CDCl3): 0.95 (t, 3H), 1.92 (m, 2H), 2.69 (m, 2H), 3.30 (m, 1H), 3.83 (s, 3H), 4.22 (d, 1H), 4.85 (q, 1H), 5.18 (m, 4H), 5.80 (m, 1H), 6.85 (br, d, 1H), 7.45 (m, 9H). Anal. C25H28N2O5, Mol. Wt.: 436.5. Found: ESI-MS: 437.1 (M+H)+.

Provenance & Evidence