The stereochemical outcome of allyl magnesium and indium additions to 5-substituted norbornen-7-ones and its application to cis fused carbocycle formation via ring rearrangement metathesis
作者:Patricia E. Standen、Dharati Dodia、Mark R. J. Elsegood、Simon J. Teat、Marc C. Kimber
DOI:10.1039/c2ob26784e
日期:——
The addition of allyl magnesium and allyl indium reagents to a key TBS protected norbornenyl building block, synthesised in 6-steps from commercially available 1,1-dimethoxy-2,3,4,5-tetrachlorocyclopentadiene, has been achieved providing the syn addition products with high diastereoselectivity. The subsequent exposure of the addition products to metathesis conditions, in the presence of ethene, then provided cis fused[3.0.3]-carbocycles with very high regioselectivity, via a Ring Rearrangement Metathesis (RRM) transformation.
向一个关键的TBS保护的诺尔戊烯基构建块中添加醇镁和醇铟试剂,这个构建块是通过6步从商业可得的1,1-二甲氧基-2,3,4,5-四氯环戊二烯合成的,已成功实现,提供了具有高二氟烯选择性的顺式加成产物。随后,在乙烯存在下将加成产物暴露于交换条件下,通过环重排交叉 (RRM) 转化,获得了具有极高区域选择性的顺式融合[3.0.3]-碳环。