Thermodynamic equilibration in Pd(0)-catalyzed interconversion of highly constrained [2.1.2] bicyclic lactones: its mechanistic investigation
作者:Young Taek Han、Seung-Mann Paek、Sujin Lee、Jong-Wha Jung、Jae-Kyung Jung、Seung-Yong Seo、Jeeyeon Lee、Young-Ger Suh
DOI:10.1016/j.tetlet.2010.03.016
日期:2010.5
Mechanistic study on the stereoselective construction of [2.1.2] bicyclic lactone skeleton via Pd(0)-catalyzed intramolecular allylic alkylation was described. The observed excellent stereoselectivity is likely due to Pd(0)-catalyzed equilibration of highly strained [2.1.2] bicyclic lactone framework via π-σ-π isomerization of π-allylpalladium complex. An efficient synthetic route to allylic carbonate as a requisite
描述了通过Pd(0)催化的分子内烯丙基烷基化[2.1.2]双环内酯骨架的立体选择性构建的机理研究。观察到的优异的立体选择性可能是由于Pd(0)催化的高张力[2.1.2]双环内酯骨架通过π-烯丙基铝络合物的π-σ-π异构化而达到的平衡。通过采用一系列闭环复分解,然后环氧化/脱甲硅烷基化所得的取代的奥沙比林中间体,也已经开发了一种有效的合成路线,以将碳酸烯丙酯作为必需的环化前体。