The steric course of some electrophilic additions to the tetrahydropyridazine ring moiety of benzo[<i>g</i>]pyridazino[1,2-<i>b</i>]-phthalazine-6, 13-dione derivatives. II.
作者:María Del Carmen Cano、Fernando Gómez-Contreras、Ana María Sanz、María Josefa Rodriguez Yunta
DOI:10.1139/v97-040
日期:1997.3.1
3-dimethyl derivatives 2a and 2b were selected as the substrates and made to react with bromine azide, iodine azide, and NBS–EtOH in order to evaluate the influence of the C-1 substituent on the product distributions. Electrophilic attack at the C-2/C-3 double bond occurs mainly in the less hindered anti fashion. The nucleophilic step governs the stereochemistry of the reaction products. Conformational factors
已经研究了在蒽环酮的二氮杂四环类似物的环 A 部分亲电加成所涉及的立体化学特征。选择 1-甲基和 1,3-二甲基衍生物 2a 和 2b 作为底物,使其与溴叠氮化物、叠氮化碘和 NBS-EtOH 反应,以评估 C-1 取代基对产物分布的影响. C-2/C-3 双键的亲电攻击主要以受阻较小的反方式发生。亲核步骤控制反应产物的立体化学。构象因素在由环 A 取代基产生的空间和电子效应中占主导地位,因为亲核试剂对中间表卤鎓离子的轴向反平行攻击显然优于赤道方法。关键词:二氮杂四环,
BALLESTEROS, M. A.;CANO, M. C.;GOMEZ, CONTRERAS F.;SANZ, A. M., REV. REAL. ACAD. CIENC. EXACT., FIS. Y NATUR. MADRID, 82,(1988) N, C. 333+
作者:BALLESTEROS, M. A.、CANO, M. C.、GOMEZ, CONTRERAS F.、SANZ, A. M.