Über eine neue Methode zur positionsselektiven Einführung von Trifluormethyl-Gruppen in Heteroaromaten, Teil<sup>1</sup>. Synthese von trifluormethyl-substituierten 1,3-Azolen (Oxazole, Thiazole, Imidazole)
作者:Klaus Burger、Klaus Geith、Dieter Hübl
DOI:10.1055/s-1988-27509
日期:——
A New Method for Regioselective Introduction of Trifluoromethyl Groups into Heteroarenes; Part 1. Synthesis of Trifluoromethyl-substituted 1,3-Azoles (Oxazoles, Thiazoles, Imidazoles) The reaction of 4,4-bis(trifluoromethyl) -substituted hetero-1,3-dienes [N-(Hexafluoro-2-propylidene)carboxamides, -thiocarboxamides, and -amidines] with tin(II) chloride affords 5-fluoro-4-trifluoromethyl- oxazoles, -thiazoles, and -imidazoles, respectively. The reaction sequence involves heterocyclic tin(IV) compounds as intermediates.
一种新的区域选择性引入三氟甲基的方法;第一部分:三氟甲基取代的1,3-氮杂环(噁唑、噻唑、咪唑)的合成 4,4-双(三氟甲基)取代的杂-1,3-二烯[N-(六氟-2-异丙叉)羧酰胺、硫代羧酰胺和脒]与锡(II)氯化物的反应分别生成5-氟-4-三氟甲基-噁唑、噻唑和咪唑。该反应序列涉及杂环锡(IV)化合物作为中间体。