Efficient preparations of novel ynamides and allenamides
作者:Lin-Li Wei、Jason A. Mulder、Hui Xiong、Craig A. Zificsak、Christopher J. Douglas、Richard P. Hsung
DOI:10.1016/s0040-4020(00)01014-0
日期:2001.1
achiral allenamides, ynamides are prepared from enamides via bromination followed by base-induced elimination of the Z-bromoenamides. These ynamides and allenamides possess improved thermal stability compared to ynamines and allenamines. They can be isolated, purified, and handled with ease, and thus, should be synthetically more useful than traditional ynamines and allenamines.
A simple one-pot preparation of N-allenyl amides, ureas, carbamates and sulfonamides using a DMSO/tBuOK protocol
作者:Thomas W. Bousfield、Marc C. Kimber
DOI:10.1016/j.tetlet.2014.11.093
日期:2015.1
A one-pot transformation of amides, ureas, carbamates and sulfonamides into synthetically useful N-allenyl analogues using a (BuOK)-Bu-t/DMSO protocol is reported. The procedure is experimentally simple and robust, and provides N-allenyl analogues, commonly used within the literature, in yields comparable to the benchmark two-step approach. (C) 2014 Elsevier Ltd. All rights reserved.
Inverse demand [4+2] cycloaddition reactions of allenamides: Reactivity scopes of an electron deficient variant of allenamines
作者:Lin-Li Wei、Hui Xiong、Christopher J. Douglas、Richard P. Hsung
DOI:10.1016/s0040-4039(99)01354-4
日期:1999.9
The synthesis and reactivity of a series of new allenamides are described. These electron deficient variants of allenamines are more stable than allenamines but possess comparable reactivity. Particularly, oxazolidinone and imidazolidinone substituted allenamides undergo efficient inversedemand [4+2] cycloaddition reactions with heterodienes, leading to unique pyranyl heterocycles. The reactivity