Stereoselective Synthesis of the C1–C9 and C11–C25 Fragments of Amphidinolides C, C2, C3, and F
作者:Daniel C. Akwaboah、Dimao Wu、Craig J. Forsyth
DOI:10.1021/acs.orglett.7b00217
日期:2017.3.3
An efficient synthesis of the C1–C9 and the C11–C25 fragments of amphidinolides C, C2, C3, and F from a common intermediate is reported. The construction of the C1–C9 fragment involves an intramolecular hetero-Michael cyclization to form the 3,5-disubstituted trans-tetrahydrofuran moiety. The approach to prepare the C11–C25 fragment utilizes a highly stereoselective aerobic cobalt-catalyzed alkenol
A convergent synthesis of bafilomycinA1 (see structure) is presented, and relies on the Zn(OTf)2‐mediated diastereoselective addition of alkynes to aldehydes. The coupling of a complex enyne with a sensitive aldehyde in the key step, in combination with a novel strategy for a chemoselective trans‐reduction of the enyne, establishes an alternative to standard palladium‐catalyzed cross‐coupling strategies
提出了聚合反应的bafilomycin A 1(见结构),并依赖于炔烃向醛类的Zn(OTf)2介导的非对映选择性加成。在关键步骤中,将复杂的烯炔与敏感的醛偶联,再结合用于烯炔的化学选择性反式还原的新策略,为形成1,3的标准钯催化交叉偶联策略提供了另一种选择-二烯。