desulfonylation sequence. Our convergent strategy allowed the total synthesis of amphidinolide F and enabled a new unifying route toward the synthesis of amphidinolides C, C2, and C3 using a late-stage divergent approach. Although there were unsatisfying yields at some critical steps, our work culminated into the first total synthesis of amphidinolide C2.
Amphidinolides F、C、C2 和 C3 是从甲藻Amphidinium物种中分离出来的海洋天然产物。它们共享相同的大环内酯核心,它们之间的区别在于侧链水平。这些ampphidinolides的一个主要特征是在大环内酯核心内存在两个反式-THF环,这被认为是通过用N-乙酰基恶唑啉硫酮的烯醇钛进行C-糖基化而构建的。因此,它们全合成的最初策略是基于对应于 C 1 –C 9、C 10 –C 19和 C 20 –C 29或 C 20的三个主要片段的组装-C 34断开连接。尽管所有片段的合成都是成功的,但 C 19和 C 20之间的 C-糖基化反应被证明是一个问题。因此,设计了第二条路线。C 17和 C 18之间的新断开是基于砜加成和脱磺酰基序列。我们的收敛策略允许全合成氨苯环内酯 F,并为使用后期发散方法合成氨苯环内酯 C、C2 和 C3 开辟了一条新的统一路线。尽管在一些关键步骤的
PROCESS FOR PRODUCING 4-SUBSTITUTED AZETIDINONE DERIVATIVE
申请人:NIPPON SODA CO., LTD.
公开号:EP0573667B1
公开(公告)日:2001-06-13
US5731431A
申请人:——
公开号:US5731431A
公开(公告)日:1998-03-24
Synthesis and Use of Achiral Oxazolidine-2-thiones in Selective Preparation of<i>trans</i>2,5-Disubstituted Tetrahydrofurans
Efficient Synthesis of the C(1)−C(9) Fragment of Amphidinolides C, C2, and F
作者:Laurent Ferrié、Bruno Figadère
DOI:10.1021/ol1021228
日期:2010.11.5
The synthesis of the C(1)−C(9) fragment of amphidinolides C, C2, and F was achieved by using a vinyloguous Mukaiyama aldol reaction on a chiral aldehyde with a silyloxyfuran and by using a C-glycosylation of a lactol derivative with an acetyl oxazolidinethione. From the available chiral acetonide−glyceraldehyde, all the stereogenic centers were perfectly induced along the synthesis. The C(1)−C(9) fragment