(4-Isopropylthiazol-2-yl)methanol → N-((4-Isopropyl-2-thiazolyl)methoxycarbonyl)valine Methyl Ester

Participants

Reaction Steps

A solution of 1.4 mmol of α-isocyanato-valine methyl ester and 0.22 g (1.4 mmol) of 2-(hydroxymethyl)-4-isopropylthiazole in 10 ml of chloroform was heated at reflux for 3 h. After being allowed to cool, the solvent was removed in vacuo, and the residue was purified by silica gel chromatography using 2% methanol in chloroform to provide 0.23 g (52%) of the desired compound (Rf 0.54, 5% methanol in dichloromethane). NMR 1H NMR (DMSO-d6) δ 0.87 (d, J=7 Hz, 3 H), 0.88 (d, J=7 Hz, 3 H), 1.23 (d, J=7 Hz, 6 H), 2.04 (octet, J=7 Hz, 1 H), 3.01 (heptet, J=7 Hz, 1 H), 3.73 (s, 3 H), 3.94 (dd, J=8, 6 Hz, 1 H), 5.26 (AA', 2 H), 7.28 (s, 1 H), 7.92 (d, J=8 Hz, 1 H). Mass spectrum: (M+H)+ =31 5.

Provenance & Evidence