Synthesis and reactions of chloroazodienes. A new and general synthesis of pyridazines
作者:Michael S. South、Terri L. Jakuboski
DOI:10.1016/0040-4039(95)01128-5
日期:1995.8
base gives 4-chloroazodienes, which were found to combine with a variety of electron rich olefins to yield chloro-substituted tetrahydropyridazines. These chloroazodiene cyclizations are best characterized as inverse electron demand, 4+2 hetero Diels-Alder reactions that maintain a high degree of regio- and stereochemical control. The chloro-substituted tetrahydropyridazines that are formed give high yields
二氯hydr酮与Hünig碱的反应生成了4-氯偶氮二烯,发现它与多种电子富集的烯烃结合,生成氯取代的四氢哒嗪。这些氯偶氮二烯环化的最佳特征是反电子需求,4 + 2杂Diels-Alder反应,可维持高度的区域和立体化学控制。形成的氯取代的四氢哒嗪在用碱处理后可得到高产率的取代的哒嗪。氯偶氮二烯环化成四氢哒嗪并随后进行芳构化的顺序构成了取代的哒嗪的新的通用合成方法。