Allenic Compounds and Isothiocyanates as Key Building Units in the Synthesis of Heterocycles
作者:Lambert Brandsma、Nina A. Nedolya
DOI:10.1055/s-2004-816005
日期:——
attack of the thiolate moiety on the allenic system and subsequent addition of methyl iodide or protonation. 1 Introduction 2 Generation of Allenic Lithium Compounds 3 Formation of 2,3-Dihydropyridines or Mixtures of 2,3-Dihydropyridines and Pyrroles 4 Directed Synthesis of Pyrroles 5 Synthesis of Quinolines 6 Synthesis of Cyclobutanopyrrolines 7 Synthesis of Thiophene and Dihydrothiophene Derivatives
锂化的丙二烯化合物和异硫氰酸酯之间的反应,R'N=C=S,在大多数情况下只产生具有丙二烯结构的硫代亚胺酸盐,C=C=CC(SLi)=NR 1 。这些中间体已用于制备 2,3-二氢吡啶、吡咯、喹啉、环丁吡咯啉和噻吩或二氢噻吩衍生物的新方法。产生环中具有氮原子的杂环的过程包括 5-烷基化,然后简单加热或用卤化铜 (I) 处理。2-氨基噻吩和 2-亚氨基-2,5-二氢噻吩是通过硫醇部分对丙二烯体系的分子内亲核攻击和随后添加甲基碘或质子化形成的。1 引言 2 艾伦锂化合物的生成 3 2,3-二氢吡啶或 2 的混合物的形成,