A Highly Efficient and Selective Route to Isomeric Cyclic Diazadienes
摘要:
A highly selective Lewis acid-catalyzed ring expansion of methylenecyclopropyl hydrazones to isomeric cyclic diazadienes is reported. In general, good to excellent yields and selectivities were obtained for a broad range of hydrazone derivatives.
A Highly Efficient and Selective Route to Isomeric Cyclic Diazadienes
摘要:
A highly selective Lewis acid-catalyzed ring expansion of methylenecyclopropyl hydrazones to isomeric cyclic diazadienes is reported. In general, good to excellent yields and selectivities were obtained for a broad range of hydrazone derivatives.
Computational and <sup>13</sup>C Investigations of the Diazadienes and Oxazadienes Formed via the Rearrangement of Methylenecyclopropyl Hydrazones and Oximes
作者:Bo Chen、Mark E. Scott、Bruce A. Adams、David A. Hrovat、Weston Thatcher Borden、Mark Lautens
DOI:10.1021/ol501710m
日期:2014.8.1
Computational and further experimental investigations of the previously reported diazadienes, obtained via the rearrangement of methylenecyclopropyl hydrazone 1 are reported. Calculations at the CCSD(T)/cc-pVTZ//B3LYP/6-31G(d) level of theory indicate that the initially reported product 3 would, if formed, undergo rapid electrocyclic ring opening and, hence, would be unstable under the reaction conditions
报道了通过亚甲基环丙基1的重排获得的先前报道的二氮杂二烯的计算和进一步的实验研究。在CCSD(T)/ cc-pVTZ // B3LYP / 6-31G(d)的理论水平上进行的计算表明,最初报告的产品3如果形成,则会经历快速的电环开环,因此在低于反应条件。基于此计算预测,对先前归因于3的13 C NMR光谱的进一步分析导致结构3对其N-甲苯磺酰基氨基吡咯结构异构体11的修订。同样,结构8,在肟6的重排中形成,被修改为N-羟基吡咯12。
A Highly Efficient and Selective Route to Isomeric Cyclic Diazadienes
作者:Mark E. Scott、Yann Bethuel、Mark Lautens
DOI:10.1021/ja067304r
日期:2007.2.1
A highly selective Lewis acid-catalyzed ring expansion of methylenecyclopropyl hydrazones to isomeric cyclic diazadienes is reported. In general, good to excellent yields and selectivities were obtained for a broad range of hydrazone derivatives.