A general one-pot synthesis of vinyl-thiiranes and conjugated dienes
摘要:
The first general synthesis of vinyl-thiiranes 5 and an efficient preparation of conjugated dienes 6 and 7 based on thio- and selenophosphates is described. (C) 1999 Published by Elsevier Science Ltd. All rights reserved.
α-Arylcarboxylic acid amides were synthesized by reacting silyl enol ethers of aryl ketones and 2-azido-1,3-dimethylimidazolinium hexafluorophosphate (ADMP, 1). Silyl enol ethers react with ADMP 1 to give N-(α-arylacyl)guanidines via the migration of aryl groups in enol ethers. The products were transformed to the corresponding α-aryl acetamides by treating with LiAlH4.
Divergent Iron-Catalyzed Coupling of<i>O</i>-Acyloximes with Silyl Enol Ethers
作者:Hai-Bin Yang、Nicklas Selander
DOI:10.1002/chem.201605636
日期:2017.2.3
An iron‐catalyzedcoupling reaction of O‐acyloximes and O‐benzoyl amidoximes with silyl enol ethers is reported. The protocol provides access to functionalized pyrroles, 1,6‐ketonitriles, pyrrolines and imidazolines via carbon‐centered radicals generated from an initially formed iminyl radical. The intramolecular cyclization and ring‐opening processes of the iminyl radical take place preferentially
afford silyl‐substituted bicyclo[5.3.0]decanes, which were highly useful as synthetic intermediates. Stereochemical studies concerning the silylenolether moiety suggested that two types of reaction pathway for the formation of seven‐membered rings were present. The reaction of (Z)‐enolsilylethers proceeded through Cope rearrangement of cis‐divinylcyclopropane intermediates, and that of (E)‐enol silyl
Abstract Reactions of trifluoromethane- and tridecafluorohexanesulfonyl chlorides with silyl enol ethers have been investigated in the presence of a ruthenium(II) phosphine complex. Perfluoroalkylation and chlorination occurred depending on the substituent of silyl enol ether; i.e. perfluoroalkylated compound was selectively obtained in the reactions with silyl enol ether possessing an electron-withdrawing
摘要 在钌 (II) 膦配合物存在下,研究了三氟甲烷和十三氟己烷磺酰氯与甲硅烷基烯醇醚的反应。全氟烷基化和氯化反应的发生取决于甲硅烷基烯醇醚的取代基;即与具有吸电子基团的甲硅烷基烯醇醚反应选择性地得到全氟烷基化化合物,而与具有给电子基团的甲硅烷基烯醇醚反应选择性地生成氯化物。
Difluorohomologation of Ketones
作者:Mikhail D. Kosobokov、Vitalij V. Levin、Marina I. Struchkova、Alexander D. Dilman
DOI:10.1021/acs.orglett.5b00097
日期:2015.2.6
CF2 fragment is described. The reaction involves silylation, room-temperature difluorocyclopropanation of silyl enol ethers, and selective ringopening of cyclopropanes under acidic conditions. The whole three-step sequence is conveniently performed in a one-pot mode.