4.6 Article

Diastereospecific arylation and cascade deconstructive amidation/thioesterification of readily available lactam-fused bromolactones

期刊

RSC ADVANCES
卷 13, 期 37, 页码 25691-25698

出版社

ROYAL SOC CHEMISTRY
DOI: 10.1039/d3ra04690g

关键词

-

向作者/读者索取更多资源

An intrinsic goal in synthetic methodology design is to find approaches that can convert readily accessible precursors into various products to tap into new 3D chemical space. In this study, readily available bicyclic lactam-bromolactones were analyzed in several fragment growth protocols, utilizing the halogen and lactone motifs as versatile linchpins for strategic bond construction.
An intrinsic goal when designing synthetic methodology is to identify approaches whereby readily accessible precursors are converted into an array of products, which efficiently tap into new 3D-chemical space. In these studies, readily available bicyclic lactam-bromolactones have been interrogated in several fragment growth protocols by utilizing the halogen and lactone motifs as versatile linchpins for strategic construction of C-C, C-N, C-O, and C-S bonds. Diastereospecific C(sp3)-C(sp2) Kumada coupling of sterically imposing [5,5]-bicyclic lactam-bromolactones with several aryl Grignard reagents, under palladium catalysis, furnishes diarylmethane-tethered lactam-lactones in synthetically attractive yields, stereoinvertive fashion, and with a tolerance for many functional groups. When [5,6]-bicyclic lactam-bromolactones, which are prone to & beta;-hydride elimination are employed, efficient arylation is observed only under Co(acac)3-catalyzed conditions. Importantly, these [5,6]-bicyclic lactam-bromolactones undergo retentive arylation, independent of the transition metal catalyst. A base-mediated cascade deconstructive amidation of the [5,6]-bicyclic lactam-bromolactones with primary aliphatic amines proceeds efficiently to afford epoxide-tethered lactam carboxamides, which bear four contiguous stereocenters. Furthermore, an unusual route to homoallylic thioesters has been uncovered through deconstructive contra-thermodynamic thioesterification of the lactam-fused bromolactone precursors. Readily available lactam-bromolactones have been interrogated in several fragment growth protocols including diastereospecific Kumada cross-coupling with Grignard reagents, cascade deconstructive amidation, and contra-thermodynamic thioesterification.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.6
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据