A new route to functionalized 3-aminopyridazines by ANRORC type ring transformation of 1,2,4-triazines with carbon nucleophiles
作者:Andrzej Rykowski、Ewa Wolinska、Henk C. Van Der Plas
DOI:10.1002/jhet.5570370434
日期:2000.7
3-chloro-6-phenyl-1,2,4-triazine 1a with carbon nucleophiles 2ad bearing a cyano substituent at a carbanionic center has been studied. In all reactions the formation of the corresponding 3-aminopyridazines 3ad takes place via ANRORC mechanism involving addition of the nucleophile at position 5 in compound 1a, ring opening with breaking of the N4C5 bond and intramolecular ring closure of the resulting open-chain
3-氯-6-苯基-1,2,4-三嗪的反应1A与碳亲核试剂2A d轴承在负碳离子中心氰基取代基进行了研究。在所有反应中,相应的3-氨基哒嗪3a d的形成均通过ANRORC机制进行,该机制涉及在化合物1a的5位添加亲核试剂,开环并破坏N 4 C 5键,以及分子内闭环,从而形成链中间体。甲15 Ñ研究用标记的苯基乙腈2A *已经表明,环外氨基的3-氨基-4,6-二苯基的氮原子3a中 最初存在于苯乙腈中。