通过将催化胺,N-甲基咪唑和N,N,N',N'-四甲基乙二胺(TMEDA)结合在一起,已开发出一种有效的方法,用于在水中作为溶剂在酰氯和醇之间进行酯化。通过使用pH调节剂将pH值保持在11.5左右,可以防止酸氯和/或酯类的分解并促进缩合,从而完成当前的Schotten-Baumann型反应。催化剂的选择(0.1当量)至关重要:N-甲基咪唑和TMEDA的组合使用具有显着的协同作用。催化胺具有两个不同的作用:(i)N-甲基咪唑与酰氯形成高反应性的铵中间体,并且(ii)TMEDA充当有效的HCl粘合剂。仔细的1 H NMR监测研究合理地支持了这些中间体的生产。在酰氯和伯胺或仲胺之间也实现了相关的酰胺形成,伯胺或仲胺包括较少的亲核或水溶性胺,例如2-(或4-)氯苯胺,Weinreb N-甲氧基胺和2,2-二甲氧基乙胺。
Diazo-Transfer Reaction with Diphenyl Phosphorazidate
作者:Jos� M. Villalgordo、Adelheid Enderli、Anthony Linden、Heinz Heimgartner
DOI:10.1002/hlca.19950780807
日期:1995.12.13
Diphenyl phosphorazidate (DPPA) was used as the azide source in a one-pot synthesis of 2,2-disubstituted3-amino-2H-azirines 1 (Scheme 1). The reaction with lithium enolates of amides of type 2, bearing two substituents at C(2), proceeded smoothly in THF at 0°; keteniminium azides C and azidoenamines D are likely intermediates. Under analogous reaction conditions, DPPA and amides of type 3 with only
Inhibitors of VEGF receptor and HGF receptor signaling
申请人:Saavedra Mario Oscar
公开号:US20070004675A1
公开(公告)日:2007-01-04
The invention relates to the inhibition of VEGF receptor signaling and HGF receptor signaling. The invention provides compounds and methods for inhibiting VEGF receptor signaling and HGF receptor signaling. The invention also provides compositions and methods for treating cell proliferative diseases and conditions
An unprecedented N-demethylation of N-methyl amides has been developed by use of N-fluorobenzenesulfonimide as an oxidant with the aid of a copper catalyst. The conversion of amides to carbinolamines involves successive single-electron transfer, hydrogen-atom transfer, and hydrolysis, and is accompanied by formation of N-(phenylsulfonyl)benzenesulfonamide. Carbinolamines spontaneously decompose to
INHIBITORS OF VEGF RECEPTOR AND HGF RECEPTOR SIGNALING
申请人:Saavedra Oscar Mario
公开号:US20120083482A1
公开(公告)日:2012-04-05
The invention relates to the inhibition of VEGF receptor signaling and HGF receptor signaling. The invention provides compounds of general formula (A)
wherein A
1
is sulfur, A
3
is CH, A
2
is CH, D is heterocycle, Z is oxygen, SO
0-2
or NR, Ar is phenyl and G is not a ring, and methods for inhibiting VEGF receptor signaling and HGF receptor signaling. The invention also provides compositions and methods for treating cell proliferative diseases and conditions.