(2-(Dimethylamino)thiazol-4-yl)methanol → N-((2-(N,N-Dimethylamino)-4-thiazolyl)methoxycarbonyl)valine Methyl Ester

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Reaktionsschritte

A solution of 505 mg (3.19 mmol) of 2-(N,N-dimethylamino)-4-(hydroxymethyl)thiazole, 3.19 mmol of α-isocyanato-L-valine methyl ester, and 100 mg of 4-dimethylaminopyridine in 30 ml of dichloromethane was heated at reflux for 3 h. The resulting solution was allowed to cool, diluted with dichloromethane, washed sequentially with 10% citric acid, aqueous Na2CO3, and brine, dried over Na2SO4, and concentrated in vacuo. The residue was purified by silica gel chromatography using 2% methanol in chloroform to provide 0.95 g (95%) of the desired compound, Rf 0.42 (4% methanol in chloroform). 1H NMR (CDCl3), δ0.84 (d, J=7 Hz, 3H), 0.93 (d, J=7 Hz, 3H), 2.12 (m, 1H), 3.11 (s, 6H), 3.73 (s, 3H), 4.24 (dd, J=8, 4 Hz, 1H), 4.99 (s, 2H), 5.26 (br d, 1H), 6.49 (s, 1H). Mass spectrum: (M+H)+ =316.

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