Synthesis and regioselective [4+2] cycloaddition/nucleophilic reactions of N-arylamino-1:3-diaza-1:3-butadienes with ketenes and accompanying rearrangements
作者:Paramita D. Dey、Arun K. Sharma、Sachchida N. Rai、Mohinder P. Mahajan
DOI:10.1016/0040-4020(95)00372-f
日期:1995.7
-butadienes 4 are shown to undergo regioselective reactions with phenyl- and chloroketenes resulting in high yields of 3-aryl-2-methylthio6-phenyl-4(3H)-pyrimidinones 7. Similar reactions with bromo- and iodoketenes, resulted, via aziridinium intermediates 12, in good yields of 3-aryl-S-(N-arylamino)-2-methylthio-6-phenyl4(3H)-pyrimidinones 13, The mechanistic aspects of cycloadditions and semi-empirical
N-Arylamino-1:3-diaza-1:3-butadienes 4与苯基和氯乙烯酮发生区域选择性反应,导致3-芳基-2-甲基硫代6-苯基-4(3H)-嘧啶酮7的高收率。经由叠氮鎓中间体12与溴和碘酮的类似反应,以高收率产生了3-芳基-S-(N-芳基氨基)-2-甲硫基-6-苯基4(3H)-嘧啶酮13,环加成反应的机理还报道了这些二氮杂丁二烯的半经验AM1计算结果。