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 carbonnucleophiles 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。
Synthesis of13C,15N-enriched α-dicarbonyl model adducts to determine the utility of13c and15N NMR for studying mechanism-based inactivation of cytochromes P-450 by substituted dichloroacetamides
作者:Scott J. Weiner、Susan M. Holl、Douglas F. Covey
DOI:10.1002/mrc.1260320212
日期:1994.2
dichloroacetamide‐containing inhibitor. 13C chemical shifts of the carbonyls attached to the nucleophiles easily distinguish the model cysteine adduct (δ 192.3) from the other adducts (δ 159.6–161.8). Although the other adducts cannot be distinguished at this carbon, the carbonyl attached to the 15N two bonds away can distinguish the lysine mimic (δ 161.2 or 161.3) from the serine (threonine) and tyrosine mimics