Regioselective N-Addition/Substitution Reaction of α-Alkylidene Pyrazolinones with Propargyl Sulfonium Salts to Construct Allylthio-Containing Pyrazolones
The regioselective N-addition/substitutionreaction between α-alkylidene pyrazolinones and propargyl sulfonium salts has been developed to construct functionalized allylthio-containing pyrazolones with moderate to excellent yields. α-Alkylidene pyrazolinones act as N-nucleophilic agents which are distinguished from reported C-nucleophilic reactions. Excellent regioselectivity, readily available starting
A novel divergent domino annulation reaction of prop-2-ynylsulfonium salts with sulfonyl-protected β-amino ketones has been developed, affording various epoxide-fused 2-methylenepyrrolidines and S-containing pyrroles in moderate to excellent yields. Prop-2-ynylsulfonium salts act as C2 synthons in the reactions providing a promising epoxide-fused skeleton in a single operation with readily accessible
Elimination–addition. Part XXI. Addition–dealkylation reactions of acetylenic sulphonium salts with oxygen, sulphur, and nitrogen nucleophiles
作者:J. W. Batty、P. D. Howes、C. J. M. Stirling
DOI:10.1039/p19730000059
日期:——
Reactions of nucleophiles with dimethylprop-2-ynylsulphonium and S-prop-2-ynyltetrahydrothiophenium bromides have been investigated. These salts readily isomerise to the allenic isomers ([graphic omitted]·C:C:C), which are susceptible to nucleophilic addition. The initially formed adducts, according to their structure, undergo several types of subsequent reaction. Most commonly, isomerisation of the
An unprecedented [3 + 2]-annulation of prop-2-ynylsulfonium salts and p-quinamines was developed, affording a series of hydroindol-5-ones with a methylthio group in moderate to good yields under mild conditions. In this reaction, the prop-2-ynylsulfonium salt acts as a novel C2 synthon and sulfide does not serve as a leaving group, which provides facile access to organosulfur compouds.
Sequential [1 + 4]- and [2 + 3]-Annulation of Prop-2-ynylsulfonium Salts: Access to Hexahydropyrrolo[3,2-<i>b</i>]indoles
作者:Penghao Jia、Qinglong Zhang、Qima Ou、You Huang
DOI:10.1021/acs.orglett.7b02298
日期:2017.9.1
A powerful sequential [1 + 4]- and [2 + 3]-annulation has been developed using prop-2-ynylsulfonium salts and sulfonyl-protected o-amino aromatic aldimines, affording a series of hexahydropyrrolo[3,2-b]indoles in high yields. Prop-2-ynylsulfonium salts act as C2 synthons in the reaction, and fused rings containing two five-membered azaheterocycles can be constructed in a single operation with readily
使用丙-2-炔基salts盐和磺酰基保护的邻氨基芳族亚胺开发了有力的顺序[1 + 4]-和[2 + 3]环化反应,提供了一系列的六氢吡咯并[3,2- b ]吲哚高产。丙-2-炔基salts盐在反应中充当C 2合成子,并且可以在一次操作中使用易于获得的起始原料构建包含两个五元氮杂杂环的稠合环。