Modular Synthesis of the C9−C27 Degradation Product of Aflastatin A via Alkyne−Epoxide Cross-Couplings
作者:Omar Robles、Frank E. McDonald
DOI:10.1021/ol800659z
日期:2008.5.1
A modular approach to the synthesis of complex polyketide natural products is demonstrated for the synthesis of the C9-C27 degradationproduct from aflastatin A. The product of the cross-coupling of C23-C27 terminal alkyne with C17-C22 epoxide underwent functionalization of the resulting internal alkyne, which was then coupled similarly with C9-C16 epoxide. This synthesis concluded with regio- and
Catalytic Enantioselective Allylation of Acetylenic Aldehydes by Chiral Phosphoric Acid/Transition Metal Cooperative Catalysis: Formal Synthesis of Fostriecin
作者:Shigenobu Umemiya、Masahiro Terada
DOI:10.1021/acs.orglett.1c01166
日期:2021.5.7
An enantioselectiveallylation of silyl-substituted acetylenic aldehydes by chiralphosphoricacid (CPA)/transition metal cooperative catalysis was developed. Enantioenriched homoallylic propargyl alcohols were obtained in good yields with excellent enantioselectivities (>99% ee) under mild conditions. Moreover, the shortest formal synthesis of fostriecin was achieved by the present enantioselective