A novel and efficient route to the construction of the 4-oxa-tricyclo[4.3.1.0]decan-2-one scaffold
作者:Nian-Guang Li、Jin-Xin Wang、Xiao-Rong Liu、Chang-Jun Lin、Qi-Dong You、Qing-Long Guo
DOI:10.1016/j.tetlet.2007.07.005
日期:2007.9
A short and efficient route to the synthesis of 4-oxa-tricyclo[4.3.1.0]decan-2-one scaffold 12 in good yield is reported. Essential to the synthesis was the implementation of selective protection of the catechol system in xanthone 2 with Ph2CCl2 and MOM groups. Subsequently, a biomimetic tandem Claisen/Diels–Alder reaction occurred to produce the desired tricyclic scaffold 11a as a single isomer. A
据报道,一种短而有效的途径以高收率合成了4-氧杂-三环[4.3.1.0]癸烷-2-酮骨架12。合成必不可少的是在具有Ph 2 CCl 2和MOM基团的蒽酮2中实现邻苯二酚系统的选择性保护。随后,发生了仿生串联的Claisen / Diels-Alder反应,生成了所需的三环骨架11a,为单一异构体。还提出了该转换的优良区域的合理化和立体选择性的建议。