Enantioselective synthesis of the C14–C25 portion of the cytotoxic natural product, amphidinolide B1
摘要:
The C14-C25 portion of the cytotoxic natural product, amphidinolide B1 (1), was synthesized enantioselectively using Myers asymmetric alkylation protocol, epoxide opening with higher order cuprate, Sharpless asymmetric epoxidation of allylic alcohol 17, and Sharpless asymmetric dihydroxylation of 24 as key steps. (C) 2000 Elsevier Science Ltd. All rights reserved.
Enantioselective synthesis of the C14–C25 portion of the cytotoxic natural product, amphidinolide B1
摘要:
The C14-C25 portion of the cytotoxic natural product, amphidinolide B1 (1), was synthesized enantioselectively using Myers asymmetric alkylation protocol, epoxide opening with higher order cuprate, Sharpless asymmetric epoxidation of allylic alcohol 17, and Sharpless asymmetric dihydroxylation of 24 as key steps. (C) 2000 Elsevier Science Ltd. All rights reserved.
Electrophile-Directed Diastereoselective Alkylation of Prochiral Enediolates
作者:Stephen P. Marsden、Rebecca Newton
DOI:10.1021/ja073624e
日期:2007.10.1
Prochiral substituted enediolates undergo diastereoselective alkylation with β-chiral primary iodohydrin derivatives, with selectivities up to 97:3. The most selective reactions occur with dienediolates, but reasonable selectivities can also be obtained with alkyl- and aryl-substituted enediolates. The presence of the lithioalkoxy substituent on the enolate is crucial for selectivity, as is the presence