在pH范围为2-13的水中(μ1.0; 25°)中,已经检查了一系列酮亚胺(9)的水合速率。注意到了三种水合成酰胺的机理(8):(a)在2-7的pH范围内,从H 3 O +进行质子转移,产生一般的酸催化作用(给出k H 3 O + / k D 3 O + 2.65);(b)在pH> 7(其中k H 2 O + / k D 2 O += 4.8)下由H 2 O进行的一般酸催化作用;(c)确定HO –攻击的速率。最后一种机制仅显示为N-芳基酮亚胺,例如(9e);其他N-烷基酮亚胺继续通过速率决定质子从水的反应进行反应,即使在pH 13时也是如此。当(9a)在酸性或碱性D 2 O中反应时,仅掺入一个氘,而氘代的酮亚胺(9f )仅掺入一个氘就证实了这一结果。)不会在水中反应时使标签松动。对于涉及从H 3 O +或H 2转移H +的反应,取代基的作用是平行的O; 在改变碳(质子化位点)上的取代基方面
在pH范围为2-13的水中(μ1.0; 25°)中,已经检查了一系列酮亚胺(9)的水合速率。注意到了三种水合成酰胺的机理(8):(a)在2-7的pH范围内,从H 3 O +进行质子转移,产生一般的酸催化作用(给出k H 3 O + / k D 3 O + 2.65);(b)在pH> 7(其中k H 2 O + / k D 2 O += 4.8)下由H 2 O进行的一般酸催化作用;(c)确定HO –攻击的速率。最后一种机制仅显示为N-芳基酮亚胺,例如(9e);其他N-烷基酮亚胺继续通过速率决定质子从水的反应进行反应,即使在pH 13时也是如此。当(9a)在酸性或碱性D 2 O中反应时,仅掺入一个氘,而氘代的酮亚胺(9f )仅掺入一个氘就证实了这一结果。)不会在水中反应时使标签松动。对于涉及从H 3 O +或H 2转移H +的反应,取代基的作用是平行的O; 在改变碳(质子化位点)上的取代基方面
Branch-Selective Synthesis of Oxindole and Indene Scaffolds: Transition Metal-Controlled Intramolecular Aryl Amidation Leading to C3 Reverse-Prenylated Oxindoles
作者:Vasily A. Ignatenko、Nihal Deligonul、Rajesh Viswanathan
DOI:10.1021/ol1012372
日期:2010.8.20
a concise branch-selective synthesis of C3 tertiary oxindoles by Cu(I)-catalyzed aryl amidation and 2,2-dimethyl indene by Pd(0)-catalyzed Heck cyclization has been accomplished from acyclic reverse-prenylated intermediates. Oxindole C3-enolate generationusing NaH followed by alkylation in the presence of appropriate electrophiles provides a novel route to quaternary C3 reverse-prenylated oxindoles
Facile Synthesis of Bicyclic Amidines and Imidazolines from 1,2-Diamines
作者:Qiang Zhu、Yixin Lu
DOI:10.1021/ol101747n
日期:2010.9.17
A facile synthesis of chiral bicyclic amidines and imidazolines from readily available 1,2-diamines has been developed. The reported synthetic strategy relies on an intramolecular cyclization which involves a carboxylic amide derived imidoyl chloride as a key intermediate and aniline serving as a leaving group.
A Diels-Alder reaction between cyclopentadiene and a variety of ketenimines is reported. A copper(I)-bis(phosphine complex catalyzes the cycloaddition across the C=N bond of the ketenimine in a [4 + 2] reaction to give an enamine intermediate that is hydrolyzed upon purification to generate aminoketones.