人人用三甲基乙烷:中村-山古1,3偶极试剂的便捷制备及烯酮缩醛的有效氧化转化

IF 2.7 4区 化学 Q1 CHEMISTRY, ORGANIC
Delio Santalucia, Andrea Francesco Landucci, Nicolò Rossi, Alessandro Mandoli
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引用次数: 0

摘要

报道了一种将中村-山古亚甲基环丙烷(MCP)前体1转化为氧稳定单线态三甲基乙烷(TMM)的简便方法,避免了原制备工艺的障碍。本文还介绍了一种将敏感的烯酮缩醛(KAs)从1,3-偶极环加成1 -贫电子烯烃转化为相应的α-羟基酯的有效氧化方法。该方法基于在丙酮中使用二甲基二氧环(DMDO),对具有酮、酯或亚胺官能团以及附加的C─C双键的许多ka具有相当好的产率(23-81%)。Rokach-Galano-Durand双环内酯rac-18的非对映选择性制备进一步证明了该方案的实用性,rac-18是合成异前列腺素衍生物的最通用的构建块之一。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Trimethylenemethane for Everyone: Convenient Preparation of the Nakamura-Yamago 1,3-Dipolar Reagent and an Effective Oxidative Transformation of Ketene Acetals

Trimethylenemethane for Everyone: Convenient Preparation of the Nakamura-Yamago 1,3-Dipolar Reagent and an Effective Oxidative Transformation of Ketene Acetals

Trimethylenemethane for Everyone: Convenient Preparation of the Nakamura-Yamago 1,3-Dipolar Reagent and an Effective Oxidative Transformation of Ketene Acetals

Trimethylenemethane for Everyone: Convenient Preparation of the Nakamura-Yamago 1,3-Dipolar Reagent and an Effective Oxidative Transformation of Ketene Acetals

A convenient route to the Nakamura-Yamago methylenecyclopropane (MCP) precursor 1 to oxygen-stabilized, singlet trimethylenemethane (TMM) is reported, which avoids the hurdles of the original preparation procedure. An effective oxidation protocol is also introduced for converting the sensitive ketene acetals (KAs) from 1,3-dipolar cycloaddition of 1 to electron-poor olefins, into the corresponding α-hydroxyesters. The method, based on the use of dimethyldioxirane (DMDO) in acetone, affords fair to good yields (23–81%) for a number of KAs endowed with ketone, ester, or imide functional groups, as well as additional C─C double bonds. The utility of the protocol is further exemplified by the diastereoselective preparation of the Rokach-Galano-Durand bicyclic lactone rac-18, one of the most versatile building-blocks for the synthesis of isoprostanoidic derivatives.

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来源期刊
CiteScore
4.70
自引率
3.70%
发文量
372
期刊介绍: Organic chemistry is the fundamental science that stands at the heart of chemistry, biology, and materials science. Research in these areas is vigorous and truly international, with three major regions making almost equal contributions: America, Europe and Asia. Asia now has its own top international organic chemistry journal—the Asian Journal of Organic Chemistry (AsianJOC) The AsianJOC is designed to be a top-ranked international research journal and publishes primary research as well as critical secondary information from authors across the world. The journal covers organic chemistry in its entirety. Authors and readers come from academia, the chemical industry, and government laboratories.
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