This report describes a new method to prepare opticallyactive β-hydroxyamines starting from primary amines. The method consists of a transformation of N-methoxycarbonylated primary amines to the corresponding enecarbamates utilizing electrochemical oxidation and an asymmetric hydroboration of the enecarbamates to produce opticallyactive β-hydroxyamines.
An efficient modification of the Hofmann rearrangement: synthesis of methyl carbamates
作者:Pranjal Gogoi、Dilip Konwar
DOI:10.1016/j.tetlet.2006.11.134
日期:2007.1
A series of methyl carbamates was synthesized using NaOCl as an oxidant in the presence of KF/Al2O3/MeOH at reflux in excellent yields.
在KF / Al 2 O 3 / MeOH的存在下,使用NaOCl作为氧化剂,以回流法合成了一系列氨基甲酸酯,收率很高。
Preparation of methyl carbamates from primary alkyl- and arylcarboxamides using hypervalent iodine
作者:Robert M. Moriarty、Calvin J. Chany、Rahde K. Vaid、Om Prakash、Sudersan M. Tuladhar
DOI:10.1021/jo00061a022
日期:1993.4
A series of 14 primary alkyl- and arylcarboxamides were treated with PhI(OAc)2 in KOH-CH3OH at 5-10-degrees-C to give the corresponding methyl carbamates in good to excellent yields. These conditions avoid the use of elemental bromine or heavy metal reagents (Pb(OAc)4, AgOAc, Hg(OAC)2), while taking advantage of the commercial availability of PhI(OAc)2. The methyl carbamates are easily purified via column chromatography on silica gel. The isolated yields of the carbamates ranged from 72 % for methyl N-cyclopropylcarbamate to 97 % for methyl N-phenylcarbamate.
Brettle, Roger; Mosedale, Alan J., Journal of the Chemical Society. Perkin transactions I, 1988, p. 2185 - 2196