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2005
Carbamic acid derivatives
Q 0630
One-Pot Synthesis of N-Substituted (3-Oxobutanyl)carbamates from Primary
Using Modified Zeolite Hβ at Room Temperature. — Tin(IV)-modified
20- 084 Amines
zeolite is described as an efficient catalyst for the carbamoylation of primary amines
with ethyl chloroformate and Michael addition of the resulting carbamates (III) to
methyl vinyl ketone. Interestingly, the synthesis of the title compounds (V) can be
achieved in one-pot with excellent product selectivity and similar overall yield. —
(RAJE, V. P.; BHAT, R. P.; SAMANT*, S. D.; Tetrahedron Lett. 46 (2005) 5, 835-837;
Org. Chem. Res. Lab., Univ. Inst. Chem. Technol., Matunga, Bombay 400 019, India;
Eng.) — Mais
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