Design and 22-step synthesis of highly potent D-ring modified and linker-equipped analogs of spongistatin 1
作者:Linda M. Suen、Makeda A. Tekle-Smith、Kevin S. Williamson、Joshua R. Infantine、Samuel K. Reznik、Paul S. Tanis、Tyler D. Casselman、Dan L. Sackett、James L. Leighton
DOI:10.1038/s41467-018-07259-x
日期:——
render chemical synthesis highly time- and resource-intensive. As a result, the design and synthesis of more acid-stable and linker functional group-equipped analogs that retain the low picomolar potency of the parent natural product requires more efficient and step-economical synthetic access. Using uniquely enabling direct complex fragment coupling crotyl- and alkallylsilylation reactions, we report a
An Aldol Approach to the Synthesis of the EF Fragment of Spongistatin 1
作者:Michael T. Crimmins、Jason D. Katz、Laura C. McAtee、Elie A. Tabet、Steven J. Kirincich
DOI:10.1021/ol015652m
日期:2001.3.1
A synthesis of the C29-C51 fragment of spongistatin 1, containing the E and F rings, has been completed. The approach relies on four diastereoselective aldol additions and an asymmetric glycolate alkylation to establish eight of the eleven stereogenic centers. The intact chlorodiene side chain was appended by a Lewis acid catalyzed addition of an allylstannane to an epoxy enol ether.
Asymmetric Total Synthesis of Spongistatins 1 and 2
作者:Michael T. Crimmins、Jason D. Katz、David G. Washburn、Shawn P. Allwein、Laura F. McAtee
DOI:10.1021/ja0262683
日期:2002.5.1
The total synthesis of spongistatin1 (1) and spongistatin2 (2) has been achieved through an advanced-stage intermediate. The synthesis is highlighted by a highly convergent assembly of the four key fragments (the C1-C15 ABfragment2, the C16-C28 CDfragment 3, the C29-C43 EF fragment 4, and the C44-C51 side chain 5) at a very advanced stage of the synthesis with minimal functional group interconversion
海绵抑素 1 (1) 和海绵抑素 2 (2) 的全合成已通过后期中间体实现。四个关键片段(C1-C15 AB 片段 2、C16-C28 CD 片段 3、C29-C43 EF 片段 4 和 C44-C51 侧链 5)在非常高级的合成阶段,具有最少的官能团相互转化。CD 片段 3 用作连接其他片段的中心构建块。AB 和 CD 螺缩酮片段的合成是通过将金属化 γ-吡喃酮添加到 β-烷氧基醛,然后进行螺缩酮化来完成的。EF 亚基以高非对映选择性组装,依赖于 N-丙酰基恶唑烷硫酮的氯钛烯醇化物和双非对映选择性硼醛醇的不对称醛醇反应,以连接 E 和 F 片段。CD 和 EF 片段的 Wittig 偶联,然后是 CDEF 酮和 AB 醛之间的非对映选择性醛醇反应,为 C44-C51 侧链的连接以及最终的大环内酯化和脱保护奠定了基础。