Synthesis and [4+2] cycloaddition reactions of 4-(N-allyl-N-aryl)amino-1,3-diaza-1,3-butadienes with vinyl-, isopropenyl- and chloroketenes: Entry to novel pyrimidinone/fused pyrimidinone derivatives
作者:Arun K Sharma、Mohinder P Mahajan
DOI:10.1016/s0040-4020(97)00873-9
日期:1997.10
allyl bromide, underwent [4+2] cycloadditions with vinyl/isopropenyl- and accompanied by rearrangements in case of chloroketenes, to yield 5-vinyl/isopropenyl pyrimidinones 5 and 5-methylthio pyrimidinones 19, respectively. The pyrimidinones 5 on refluxing in xylene gave pyrimidoazepines 6, underwent annelation reaction, in refluxing benzene in presence of AlCl3, to yield pyrimidoquinolines 7 and on
4-(N-烯丙基-N-芳基)氨基-1,3-二氮杂-1,3-丁二烯2,通过用烯丙基溴处理N-芳基氨基-1,3-二氮杂-1,3-丁二烯1制备,用乙烯基/异丙烯基-进行[4 + 2]环加成,并在氯乙烯酮的情况下伴随重排,分别得到5-乙烯基/异丙烯基嘧啶酮5和5-甲硫基嘧啶酮19。所述嘧啶酮5上在二甲苯回流,得到pyrimidoazepines 6,后行成环反应,在氯化铝存在下回流的苯3,得到pyrimidoquinolines 7并在回流的甲苯中用DMAD处理,进行了[4 + 2]环加成,并伴随有N-烯丙基芳基胺官能团的消除,从而生成喹唑啉酮9。此外,5与PhSH在AIBN存在下在回流的苯中的反应遵循了涉及N-芳基的异常自由基环化反应,从而导致嘧啶并喹啉10。嘧啶酮19的碘环化反应产生了嘧啶并嗪20。