Enantioselective synthesis of (+)-anatoxin-a via enyne metathesis
作者:Jehrod B. Brenneman、Rainer Machauer、Stephen F. Martin
DOI:10.1016/j.tet.2004.06.021
日期:2004.8
A concise synthesis of the potent nAChR agonist (+)-anatoxin-a (1) has been completed by a series of nine chemical operations and in 27% overall yield from commercially available d-methyl pyroglutamate (12). The strategy featured the application of a new protocol for the diastereoselective synthesis of cis-2,5-disubstituted pyrrolidines bearing unsaturated sidechains and an intramolecular enyne metathesis
The invention relates to water soluble antitumor analogs of paclitaxel of formula (I) wherein R1=C(O)CH2CH(OH)COOX, R2=H, C(O)CH2CH(OH)COOX, X=H, Li, Na or any other pharmaceutically acceptable counterion, as well as to a pharmaceutical composition comprising an antineoplastically effective amount of such analogs as an active ingredient.