Studies on Development of Sufficiently Chemoselective N-Acylation Reagents: N-Acyl-N-(2,3,4,5,6-pentafluorophenyl)methanesulfonamides
摘要:
A variety of storable N-acyl-N-(2,3,4,5,6-pentafluorophenyl)met (4a-e) prepared from N-2,3,4,5,6-pentafluorophenylmethanesulfonamide (3), have been developed after systematic research on the structure-reactivity relationship and were found to serve as N-acylation reagents exhibiting sufficiently good chemoselectivity. (C) 2000 Elsevier Science Ltd. All rights reserved.
Parallel Synthesis of Ureas and Carbamates from Amines and CO<sub>2</sub> under Mild Conditions
作者:Scott L. Peterson、Sabrina M. Stucka、Christopher J. Dinsmore
DOI:10.1021/ol100259j
日期:2010.3.19
A mild and efficient library synthesis technique has been developed for the synthesis of ureas and carbamatesfrom carbamic acids derived from the DBU-catalyzed reaction of amines and gaseous carbondioxide. Carbamic acids derived from primary amines reacted with Mitsunobu reagents to generate isocyanates in situ which were condensed with primary and secondaryamines to afford the desired ureas. Similarly
Palladium-catalyzed reactions in aqueous media. An efficient removal of allyloxycarbonyl protecting group from oxygen and nitrogen
作者:Jean Pierre Genêt、Errol Blart、Monique Savignac、Stéphane Lemeune、Jean-Marc Paris
DOI:10.1016/s0040-4039(00)60524-5
日期:1993.6
The Allyloxycarbonyl (Alloc) moiety can be removed smoothly and selectively in good yield (70–99%) from allylicesters, carbamates and carbonates by aqueous Pd (0) catalyzed allyl transfer to diethylamine as the accepting nucleophile. The method has been successfully used for deprotection of a wide range of secondary amines.
Practical palladium-mediated deprotective method of Allyloxycarbonyl in aqueous media
作者:Jean Pierre Geneˆt、Errol Blart、Monique Savignac、Stéphane Lemeune、Sandrine Lemaire-Audoire、Jean-Marc Paris、Jean-Marie Bernard
DOI:10.1016/s0040-4020(01)80771-7
日期:1994.1
esters, carbamates and carbonates by aqueous Pd (O) catalysed allyl transfer to diethylamine in aqueous media employing a water soluble phosphine. The allyl scavenger as well as by product allyl diethylamine are volatile and easily removed in vacuo. In a two phase system an increased selectivity is seen. The method has been successfully used for deprotection of a wide range of secondary amines or base