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朝向拉春库林的立体十五元片段的不对称合成。

Asymmetric synthesis of a stereopentade fragment toward latrunculins.

作者信息

Joyeux Benjamin, Gamet Antoine, Casaretto Nicolas, Nay Bastien

机构信息

Laboratoire de Synthèse Organique, Ecole Polytechnique, CNRS, ENSTA, Institut Polytechnique de Paris, 91128 Palaiseau, France.

Laboratoire de Chimie Moléculaire, Ecole Polytechnique, CNRS, Institut Polytechnique de Paris, 91128 Palaiseau, France.

出版信息

Beilstein J Org Chem. 2023 Apr 3;19:428-433. doi: 10.3762/bjoc.19.32. eCollection 2023.

Abstract

Latrunculins are marine toxins used in cell biology to block actin polymerization. The development of new synthetic strategies and methods for their synthesis is thus important in order to improve, modulate or control this biological value. The total syntheses found in the literature all target similar disconnections, especially an aldol strategy involving a recurrent 4-acetyl-1,3-thiazolidin-2-one ketone partner. Herein, we describe an alternative disconnection and subsequent stereoselective transformations to construct a stereopentade amenable to latrunculin and analogue synthesis, starting from (+)-β-citronellene. Key stereoselective transformations involve an asymmetric Krische allylation, an aldol reaction under 1,5- stereocontrol, and a Tishchenko-Evans reduction accompanied by a peculiar ester transposition, allowing to install key stereogenic centers of the natural products.

摘要

拉春库林是用于细胞生物学中阻断肌动蛋白聚合的海洋毒素。因此,开发新的合成策略和方法来合成它们对于提高、调节或控制这种生物学价值很重要。文献中报道的全合成均针对类似的断键方式,尤其是涉及一个重复使用的4-乙酰基-1,3-噻唑烷-2-酮酮类化合物的羟醛策略。在此,我们描述了一种从(+)-β-香茅烯出发,通过一种替代的断键方式及后续立体选择性转化来构建适合拉春库林及其类似物合成的立体十五元环的方法。关键的立体选择性转化包括不对称的克里施烯丙基化反应、1,5-立体控制下的羟醛反应以及伴有特殊酯转位的蒂申科-埃文斯还原反应,从而能够构建天然产物的关键立体中心。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bf1d/10113517/0f5a6f674b20/Beilstein_J_Org_Chem-19-428-g002.jpg

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