Switch of Addition and Ring-Opening Reactions of Oxabicyclic Alkenes with Terminal Alkynes by sp<sup>2</sup>-C,P- and sp<sup>3</sup>-C,P-Palladacycle Catalysis
Palladacycles were found to be efficient catalysts for the reaction of oxabicyclic alkenes with terminalalkynes. A switch of reaction selectivity was realized using a palladacycle with an sp2 or sp3 C–Pd bond. Addition products were afforded predominantly using a palladacycle with an sp3 C–Pd bond, while ring-opening compounds were the major products when palladacycles having an sp2 C–Pd bond were
ASYMETRIC SYNTHESIS OF NORCANTHARIDIN ANALOUGUS BY ALKYNYLATION OF OXABENZONORBORNADIENES AND THEIR ANTICANCER ACTIVITIES
申请人:HONG KONG BAPTIST UNIVERSITY
公开号:US20140187801A1
公开(公告)日:2014-07-03
The present invention relates to a type of norcantharidin analogues and a method to synthesis such norcantharidin analogues by transition metal-catalyzed alkynylation of 7-oxabenzonorbornadienes. The present invention also relates to the use of such norcantharidin analogues in manufacture of a medicament for the treatment of cancer tumors.
US8835658B2
申请人:——
公开号:US8835658B2
公开(公告)日:2014-09-16
Iridium-catalyzed asymmetric hydroalkynylation reactions of oxabenzonorbornadienes
作者:Jun Hu、Qingjing Yang、Jianbin Xu、Chao Huang、Baomin Fan、Jun Wang、Chengyuan Lin、Zhaoxiang Bian、Albert S. C. Chan
DOI:10.1039/c2ob26775f
日期:——
Oxabenzonorbornadienes were found to be suitable substrates for asymmetric hydroalkynylation reactions. Catalyzed by the complex of [Ir(COD)Cl]2 and (R)-SYNPHOS, oxabenzonorbornadienes and terminalalkynes could react smoothly to give the alkynylated products in moderate to good yields (up to 93% yield) and enantioselectivities (up to 85% ee).