Me<sub>3</sub>Al-mediated domino nucleophilic addition/intramolecular cyclisation of 2-(2-oxo-2-phenylethyl)benzonitriles with amines; a convenient approach for the synthesis of substituted 1-aminoisoquinolines
作者:Krishna M S Adusumalli、Lakshmi N S Konidena、Hima B Gandham、Krishnaiah Kumari、Krishna R Valluru、Satya K R Nidasanametla、Venkateswara R Battula、Hari K Namballa
DOI:10.3762/bjoc.17.186
日期:——
amines in the presence of Me3Al. The reaction proceeds via a domino nucleophilic addition with subsequent intramolecular cyclisation. This method provides a wide variety of substituted 1-aminoisoquinolines with good functional group tolerance. Furthermore, the synthetic utility of this protocol was demonstrated in the successful synthesis of the antitumor agent CWJ-a-5 in gram scale.
通过在 Me 3 Al存在下用胺处理 2-(2-oxo-2-苯乙基) 苄腈,实现了一种用于构建 1-氨基异喹啉的简单有效的方案。该反应通过多米诺亲核加成和随后的分子内环化进行。该方法提供了多种具有良好官能团耐受性的取代 1-氨基异喹啉。此外,该协议的合成效用在克级抗肿瘤剂 CWJ-a-5 的成功合成中得到了证明。
CONJUGATED HETEROCUMULENES. SYNTHESIS OF C=C-CONJUGATED CARBODIIMIDES BY A WITTIG-TYPE REACTION OF IMINOPHOSPHORANES WITH ISOCYANATES AND THEIR CYCLOADDITIONS
A Wittig-type reaction of N-(1,2-diarylethenyl)iminophosphoranes with isocyanates gave C=C-conjugatedcarbodiimides, which were utilized in the synthesis of heterocycles.
Thermal or Lewis acid-promoted electrocyclisation and hetero Diels–Alder cycloaddition of α,β-unsaturated (conjugated) carbodiimides: a facile synthesis of nitrogen-containing heterocycles
β-styrylcarbodiimide was entirely unreactive toward either the electrocyclisation or the Diels–Alderreaction even under severe reaction conditions. 4-Coumarylcarbodiimide underwent an inverse electron-demand Diels–Alderreaction with an enamine either thermally or in the presence of a Lewis acid catalyst to afford chromenopyridines. Thus experimentally observed reactivity differences of the substituted