Hypervalent iodine in organic synthesis. A new route to α-functionalized carboxylate esters.
作者:Robert M. Moriarty、Henry Hu
DOI:10.1016/s0040-4039(01)90541-6
日期:1981.1
Aryl and alkylcarboxylate esters are converted into the corresponding α-hydroxy acids or α-alkoxyesters upon treatment with C6H5I(OAc)2 and base in the appropriate solvent.
在合适的溶剂中用C 6 H 5 I(OAc)2和碱处理后,芳基和烷基羧酸酯转化为相应的α-羟基酸或α-烷氧基酯。
Compounds of formula (I) are inhibitors of LMP7 and can be employed, inter alia, for the treatment of an autoimmue disorder abnomality or hematological malignancies.
A Facile One-Pot Synthesis of α-Hydroxy Acids and Their Derivatives
作者:Claudie Florac、Philippe Le Grel、Michèle Baudy-Floc'h、Albert Robert
DOI:10.1055/s-1991-26562
日期:——
2-Substituted oxirane-1,1-dicarbonitriles react with water, alcohols or phenol to give 2-substituted 2-hydroxyacetic acids, alkyl 2-alkoxyacetates and phenyl 2-phenoxyacetates, respectively. Reaction of 2-substituted oxirane-1,1-dicarbonitrile with thiophenol and a nucleophile, typically water ethanol or urea, gave 2-(phenylthio)acetic acids, ethyl 2-(phenylthio)acetates and N-aminocarbonyl-2-(phenylthio)acetamides.
the structure of the isocyanide. The use of an electron-deficient aryl isocyanide, such as 2c and 2d, is required to selectively obtain the monoinsertion product. When aryl isocyanides containing alkyl substituents, such as 2a and 2b, are employed, two molecules of the isocyanide are incorporated, and the double-insertion product is obtained. The reaction of tert-octyl isocyanide also induces a double
描述了布朗斯台德酸催化异氰化物正式插入缩醛的 CO 键。各种非环状和环状缩醛可以应用于催化插入以形成 α-烷氧基亚胺酸酯。官能团,例如硝基、氰基、卤素、酯和烷氧基,可以耐受所采用的反应条件。反应过程高度依赖于异氰化物的结构。需要使用缺电子的芳基异氰化物,例如 2c 和 2d,以选择性地获得单插入产物。当使用含有烷基取代基的芳基异氰化物,例如2a和2b时,引入两个分子的异氰化物,得到双插入产物。叔辛基异氰化物的反应也诱导了双重掺入,但随后的酸介导的断裂会导致 2-烷氧基亚胺酰氰化物。单插入产物 α-烷氧基亚胺酸酯可以很容易地水解为 α-烷氧基酯,从而实现缩醛的正式羰基化。
Gold(<scp>i</scp>) “click” 1,2,3-triazolylidenes: synthesis, self-assembly and catalysis
作者:Kelly J. Kilpin、Ursula S. D. Paul、Ai-Lan Lee、James D. Crowley
DOI:10.1039/c0cc02185g
日期:——
Novel gold(I) âclickâ carbene(1,2,3-triazolylidene) complexes have been synthesised, characterised and exploited for the self-assembly of a metallomacrocycle and as precatalysts for gold(I)-catalysed reactions.