The manuscript describes a novel and efficient oxidative bromination of olefins, alkynes, and ketones with HBr as the brominating reagent and DMSO as the mild oxidant. This chemistry provides an...
I<sub>2</sub>-catalyzed synthesis of substituted imidazoles from vinyl azides and benzylamines
作者:Likui Xiang、Yanning Niu、Xiaobo Pang、Xiaodong Yang、Rulong Yan
DOI:10.1039/c5cc01155h
日期:——
A novel and efficient I2-catalyzed oxidative tandem cyclization of simple vinyl azides and benzylamines has been developed for the synthesis of substituted imidazoles.
一种新颖高效的I2催化的氧化串联环化反应已经开发出来,用于合成取代咪唑。
Electrochemical bromination of cyclic and acyclic enes using biphasic electrolysis
simple method of electrochemical bromination of a series of cyclic and acyclic enes (styrene and substituted styrenes, stilbene, indene, and cyclooctene) in a biphasic water–chloroform mixture mediated by bromide/bromine redox system is reported. Aqueous 25% NaBr/H2SO4 is used as the electrolyte. Regio- and stereoselective dibromination of enes is achieved. Moderate to excellent yields of the product (83–98%)
The intramolecular reaction of acetophenone <i>N</i>-tosylhydrazone and vinyl: Brønsted acid-promoted cationic cyclization toward polysubstituted indenes
TsNHNH2, a Brønsted acid-promoted intramolecular cyclization of o-(1-arylvinyl) acetophenone derivatives was developed, leading to polysubstituted indenes with complexity and diversity in moderate to excellent yields. In sharp contrast with either the radical or carbene involved cyclization of aldehydic N-tosylhydrazone with vinyl, a cationiccyclization pathway was involved, where N-tosylhydrazone served
Ketene S,S-acetal derivative, a process for manufacturing thereof and a
申请人:Nihon Nohyaku Co., Ltd.
公开号:US04636519A1
公开(公告)日:1987-01-13
A novel ketene S,S-acetal derivative which is useful as an antimycotic agent and an agricultural chemical of fungicidal, plant growth regulating or insecticidal properties represented by the general formula (I): ##STR1## wherein R represents a hydrogen atom; an alkyl group having 1 to 8 carbon atoms; a cycloalkyl group having 3 to 6 carbon atoms; a methylene group; a lower alkenyl group; a lower alkyl group substituted by a halogen atom, a cyano group, a lower alkoxy group, a lower alkylthio group; a carbamoyl group, an acyl group, or an alkenoyloxy group; a phenyl group represented by ##STR2## (in which R.sub.1 represents a hydrogen atom, a halogen atom, a straight or branched chain lower alkyl group, a lower alkoxyl group which may be substituted by one or more halogen atoms, a phenoxy group or a methylenedioxy group, and m represents an integer of 1 to 3); a benzyl group; a methylenedioxybenzyl group; a phenoxyalkyl group; a phenoxyalkyl group substituted by a halogen atom; a naphthyl group; or a substituted or unsubstituted pyridyl group.