New Addition Reactions of Organometal Compounds with 4,4-Dimethyl-1,3-thiazole-5(4H)-thiones
作者:Junxing Shi、Heinz Heimgartner
DOI:10.1002/hlca.19960790206
日期:1996.3.20
Addition reactions of organometallic reagents with 4,4-disubstituted 1,3-thiazole-5(4H)-thiones were studied. Whereas the reactions with alkyllithium and alkyl Grignard reagents occurred in the thiophilic manner, the carbophilic addition was observed with allyllithium and allyl Grignard reagents. A radical reaction mechanism is proposed for rationalizing these observations (Scheme 5). A radical cyclization
研究了有机金属试剂与4,4-二取代的1,3-噻唑-5(4 H)-硫酮的加成反应。与烷基锂和烷基格利雅试剂的反应是以亲硫方式发生的,而烯丙基锂和烯丙基格利雅试剂则观察到了嗜热加成。为了使这些观察合理化,提出了一种自由基反应机理(方案5)。所制备的5-烯丙基-4,5-二氢-1,3-噻唑-5-硫醇衍生物的自由基环化产生1,6-二硫代-3-氮杂螺并[4.4]非-2-烯(表4)。