Mixed carboxylic–sulfonic anhydride in reaction with imines: a straightforward route to water-soluble β-lactams <i>via</i> a Staudinger-type reaction
作者:Olga Bakulina、Dmitry Dar'in、Mikhail Krasavin
DOI:10.1039/c8ob00768c
日期:——
carboxylic–sulfonic anhydride in reaction with imines is reported. Unlike its well-studied isostere homophthalic anhydride, benzo[c][1,2]oxathiin-3(4H)-one 1,1-dioxide gave no product of a formal [4 + 2] cycloaddition and only followed an alternative reaction pathway toward β-lactams, presumably, via a formal [2 + 2] cycloaddition (a Staudinger-type reaction). Optimized reaction conditions involve the use
据报道,第一个使用混合的羧酸-磺酸酐与亚胺反应的例子。与苯丙[ c ] [1,2]恶臭素-3(4 H)-1,1,1-二氧化物不同,它的研究方法广为人知,它没有形成正式的[4 + 2]环加成反应的产物,并且仅在可替代的反应后进行可能通过正式的[2 + 2]环加成反应(Staudinger型反应)通向β-内酰胺的途径。优化的反应条件包括使用三乙胺作为碱助催化剂,这还允许通过常规柱色谱法分离相应的三乙铵盐形式的产物β-内酰胺苯磺酸。反应显示出对反式有一些偏爱-异构体形成;在某些情况下,可以分离出纯的非对映异构体。
Remarkable ketene substituent dependent effect of photo irradiation on the diastereoselectivity in the Staudinger reaction
作者:Zhanhui Yang、Jiaxi Xu
DOI:10.1016/j.tetlet.2011.12.003
日期:2012.2
Controlling diastereoselectivity is a challenging issue in the Staudinger reaction. The influence of ultraviolet irradiation on the stereoselectivity in the Staudinger reaction has been investigated. The results indicate that ultraviolet irradiation is one of the most important means to regulate the diastereoselectivity of the products in the Staudinger reaction, whatever ketenes were generated from
A fundamentally newreagent space has been discovered for the Castagnoli-Cushman reaction. Cyclic anhydride has been successfully replaced with CDI-activated monoesters of homophthalic acid allowing direct preparation of tetrahydroisoquinolonic esters. Mechanistic studies suggested a new reaction pathway not involving any previously described alkoxyisocoumarines.
Synthesis of new azepino[3,4,5-<i>cd</i>]indole derivatives
作者:J. F. Hayes、J. D. Hayler、T. C. Walsgrove、C. Wicks
DOI:10.1002/jhet.5570330136
日期:1996.1
New 2-oxoazepino[3,4,5-cd]indolederivatives were formed by the reaction of the tosylate SK&F 98339 with N-alkyl and N-arylidenepropylamines in moderate yield.
通过甲苯磺酸酯SK&F 98339与N-烷基和N-亚芳基丙胺的反应以中等收率反应生成新的2-氧杂氮杂环庚烷[3,4,5- cd ]吲哚衍生物。
Ortho-Nitro Effect on the Diastereoselective Control in Sulfa-Staudinger and Staudinger Cycloadditions
The ortho-nitro effect was discovered in sulfa-Staudinger cycloadditions of ethoxycarbonylsulfene with linear imines. When an ortho-nitro group is present at the C-aryl substituents of linear imines, the sulfa-Staudinger cycloadditions deliver cis-β-sultams in considerable amounts, together with the predominant trans-β-sultams. In other cases, the above sulfa-Staudinger cycloadditions give rise to trans-β-sultams