Triethylamine → N-(thiazol-5-ylmethoxycarbonyl)-N,N-bis[(2S)-2-(thiazol-5-ylmethoxycarbonylamino)-3-phenylpropyl]amine

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Reaction Steps

The product from Example 35 (30 mg, 0.053 mmol) in ethyl acetate (2 mL) was treated with a solution of 4-nitrophenyl 1,3-thiazol-5-ylmethyl carbonate [prepared from 4-nitrophenyl 1,3-thiazol-5-ylmethyl carbonate hydrochloride salt (18 mg, 0.058 mmol) by extraction with aqueous NaHCO3], triethylamine (15 μl, 0.106 mmol), and N,N-dimethylaminopyridine (6 mg, 0.053 mmol) at ambient temperature. After stirring for 18 hours, the mixture was washed with aqueous 10% K2CO3 (5×2 mL), brine (2 mL), dried over sodium sulfate, filtered, and the filtrate was concentrated. The residue was purify on a silica gel cartridge eluting with (chloroform:methanol, 99:1) to provide the title compound (13.4 mg, 36%). 1H NMR (CDCl3) δ 8.80-8.68 (m, 3H), 7.81 (m, 3H), 7.31-6.96 (m, 10H), 5.27-5.05 (m, 6H), 4.04-3.25 (m, 5H), 3.11-2.98 (m, 2H), 2.89-2.56 (m, 5H); MS (ESI+) m/z 707 (M+H)+.

Provenance & Evidence