Photoactive C16-C21 fragmentation of catharanthine
作者:Richard J. Sundberg、Patrice Desos、Kumar G. Gadamasetti、Michal Sabat
DOI:10.1016/0040-4039(91)80680-5
日期:1991.6
Photolysis of catharanthine in the presence of several potential electron acceptors and cyanide ion leads to either addition of cyanide at C3 and C5 or to C16-C21 fragmentation and addition of cyanide at C21. The product composition depends on the acceptor and the presence or absence of oxygen
Oxidative fragmentation of catharanthine by dichlorodicyanoquinone
作者:Richard J. Sundberg、Phyllis J. Hunt、Patrice Desos、Kumar G. Gadamasetti
DOI:10.1021/jo00005a007
日期:1991.3
Oxidation of catharanthine by DDQ leads to formation of products resulting from fragmentation of the C16-C21 bond as well as C3 and C5 dehydrogenation. Among the products are compounds containing a cyclopropane ring formed by bonding between C14 and C16. Cyclopropane ring formation can be also be observed from the intermediate generated by Potier-Polonovski fragmentation of catharanthine N-oxide.