Synthesis of Hydantoins from Enantiomerically Pure α-Amino Amides without Epimerization
作者:Dun Zhang、Xuechao Xing、Gregory D. Cuny
DOI:10.1021/jo052474s
日期:2006.2.1
A method for the preparation of enantiomerically pure hydantoins fromopticallypure α-amino amides utilizing triphosgene is described. We also propose that the racemization observed with 1,1‘-carbonyldiimidazole (CDI) for this type of reaction is due to the imidazole carbamate intermediates.
作者:Christopher F. Cain、Evan H. Howard、Justin A. Goodwin、Juan R. Del Valle
DOI:10.24820/ark.5550190.p010.897
日期:——
Eleganine A is a cytotoxic indole alkaloid recently isolated from the leaves of Tabernaemontana elegans. Its unique structure arises from rearrangement of a canonical corynanthe skeleton, resulting in the presence of a 4-ethylidene-3-alkylproline core. Employing a chiron approach, we describe an efficient and scalable synthesis of the proline subunit of eleganine A, as well as efforts toward its proposed
Eleganine A 是一种细胞毒性吲哚生物碱,最近从 Tabernaemontana elegans 的叶子中分离出来。其独特的结构源于规范的珊瑚藻骨架的重排,导致存在 4-亚乙基-3-烷基脯氨酸核心。我们采用 chiron 方法,描述了 eleganine A 脯氨酸亚基的有效且可扩展的合成,以及对其提议结构的努力。
Site-directed late-stage diversification of macrocyclic nannocystins facilitating anticancer SAR and mode of action studies
A series of side chain analogues accessed via post-macrocyclization diversification of a serine-incorporating nannocystin, facilitating SAR-informed design of a coumarin-based fluorescent probe localized predominantly into endoplasmic reticulum.
一系列侧链类似物是通过丝氨酸结合鞣酸蛋白的大环化后多样化获得的,有助于以 SAR 为基础设计一种主要定位在内质网的香豆素荧光探针。