Transformation of Hydroxycycloalkanones to Oxabicycloalkenes
摘要:
Oxabicycloalkenes, which represent anti-Bredt enol ethers, can be generated by catalytic dehydration of the hemiacetals of hydroxycycloalkanones (Method I). Another option is provided by the transformation of hydroxycycloalkanones to the corresponding 1,2,3-selenadiazoles and their thermal fragmentation on Cu powder (Method II). The intermediate hydroxycycloalkynes show a transannular addition of the OH group to the triple bond. Altogether seven new oxabicycloalk-1-enes were obtained by this methods.
Synthesis by chiral diamine-mediated asymmetric alkylation
申请人:Deng Xiaohu
公开号:US20060069250A1
公开(公告)日:2006-03-30
Chiral synthesis from an achiral starting material by chiral diamine-mediated, such as sparteine-mediated, intermolecular asymmetric alkylation with a strained cyclic ether in the presence of a Lewis acid.