A Direct and Efficient Stereocontrolled Synthetic Route to the Pseudopterosins, Potent Marine Antiinflammatory Agents
作者:E. J. Corey、Scott E. Lazerwith
DOI:10.1021/ja983041s
日期:1998.12.1
Described herein is a newsyntheticroute to pseudopterosin aglycone (3), a key intermediate for the synthesis of a group of antiinflammatory natural products including pseudopterosin A (1) and E (2). The pathway of synthesis starts with the abundant and inexpensive (S)-(−)-limonene and its long-known cyclic hydroboration product (4) and leads to the chiral hydroxy ketone 6. Conversion of 6 to 10 followed
本文描述了拟珊瑚素苷元 (3) 的新合成路线,拟珊瑚素苷元是合成包括拟珊瑚素 A (1) 和 E (2) 在内的一组抗炎天然产物的关键中间体。合成途径始于丰富且廉价的 (S)-(-)-柠檬烯及其久负盛名的环状硼氢化产物 (4),并生成手性羟基酮 6。6 转化为 10,然后进行新的芳香环化产生了 15,其经历了高度非对映选择性环化,以提供受保护的拟珊瑚素苷元 16。天然存在的拟珊瑚素如 1 和 2 很容易从这个关键中间体中获得。
Enantioselective Total Synthesis of Pseudopteroxazole and Ileabethoxazole
作者:Xuan Zhang、Xianhe Fang、Miao Xu、Yibo Lei、Zibo Wu、Xiangdong Hu
DOI:10.1002/anie.201901651
日期:2019.6.3
Enantioselectivetotal syntheses of pseudopteroxazole (1) and ileabethoxazole (2) are presented. The two original stereocenters were constructed in excellent enantioselectivity and good diastereoselectivity through Carreira's asymmetric dual catalytic allylation, which shows potential for accessing diastereoisomers at C2 and C3 of 1 and 2. Cationic cyclizations of 13 and 24 demonstrated an effective
Enantiospecific Synthesis of the Proposed Structure of the Antitubercular Marine Diterpenoid Pseudopteroxazole: Revision of Stereochemistry
作者:Ted W. Johnson、E. J. Corey
DOI:10.1021/ja010221k
日期:2001.5.1
An enantiospecific synthesis of structure 1, previously assigned to the antitubercular marine natural product pseudopteroxazole, has been accomplished as outlined in Scheme 1. Coupling of diene acid 3 and amino phenol 4 produced the amide 5, which was subjected to a novel oxidative intramolecular Diels-Alder reaction to generate the tricyclic lactam 6a stereoselectively. This product was transformed
Ylide rearrangements: a [3,2]-sigmatropic process in a phosphorus ylide
作者:J. E. Baldwin、Major C. H. Armstrong
DOI:10.1039/c2970000631b
日期:——
3-methylbut-2-enyl-diphenyl-(3-methylbut-2-enyl)phosphorane has been examined: unlike the carbon, nitrogen, oxygen, and sulphur analogues of this molecule only a small fraction of the rearrangement proceeds through the [3,2]-sigmatropic shift, the major pathway being a radical dissociation–recombination.