描述了通过分子内腈氧化物-烯烃环加成 (INOC) 合成 macrosphelide B 的研究。特别是,就面部选择性而言,使用相转移催化剂的不对称 INOC 方法似乎是构建巨球体 B 的大环内酯骨架的潜在有效且通用的方法。我们的初步和前所未有的立体选择性程序有望通过进一步研究来有效地应用于合成大球体家族。
描述了通过分子内腈氧化物-烯烃环加成 (INOC) 合成 macrosphelide B 的研究。特别是,就面部选择性而言,使用相转移催化剂的不对称 INOC 方法似乎是构建巨球体 B 的大环内酯骨架的潜在有效且通用的方法。我们的初步和前所未有的立体选择性程序有望通过进一步研究来有效地应用于合成大球体家族。
Highly concise syntheses of (+)-macrosphelides A and B were accomplished in this study. The key feature of our synthetic route involved the direct three-carbon homologation of the readily available Weinreb amide 6 by the addition of a trans-vinylogous ester anion equivalent and facile construction of the 16-membered macrolide skeleton of macrosphelides via an intramolecular nitrile oxide−olefin cycloaddition
[reaction: see text]. Unified and highly convergent total syntheses of (+)-macrosphelides A and B are described. Key features of the syntheses include (1) concise synthesis of the optically active delta-hydroxy-gamma-keto alpha,beta-unsaturated acid fragment via the direct addition of a trans-vinylogous ester anion equivalent to the readily available Weinreb amide and (2) facile construction of the
Synthetic Studies on Bioactive Natural Polyketides: Intramolecular Nitrile Oxide-Olefin Cycloaddition Approach for Construction of a Macrolactone Skeleton of Macrosphelide B
作者:Seung-Mann Paek、Young-Ger Suh
DOI:10.3390/molecules16064850
日期:——
of macrosphelide B via an intramolecular nitrile oxide-olefin cycloaddition (INOC) is described. In particular, an asymmetric INOC approach using phase transfer catalysts seems to be a potentially efficient and versatile procedure for the construction of the macrolactone skeleton of macrosphelide B in terms of facial selectivity. Our preliminary and unprecedented stereoselective procedure is anticipated
描述了通过分子内腈氧化物-烯烃环加成 (INOC) 合成 macrosphelide B 的研究。特别是,就面部选择性而言,使用相转移催化剂的不对称 INOC 方法似乎是构建巨球体 B 的大环内酯骨架的潜在有效且通用的方法。我们的初步和前所未有的立体选择性程序有望通过进一步研究来有效地应用于合成大球体家族。