Synthesis of Two Stereoisomers of a Natural Cyclotetrapeptide and Four Stereoisomeric Diheteropeptins Through Late-Stage Scaffold Diversification

IF 2.7 4区 化学 Q1 CHEMISTRY, ORGANIC
Rajat Ghosh, Manisha Kundu, Prof. Dr. Shital K. Chattopadhyay
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Abstract

A concise synthetic route has been developed to access two stereoisomers 5a-b of a biologically enticing naturally occurring cyclic tetrapeptide through late-stage diversification of the cyclopeptidic scaffold 8. A cross-metathesis reaction of this template with the olefins 9a-b, preparaed from enantiomeric methyl lactates 10, produced the α,β-unsaturated ketones 7a-b which on subsequent hydrogenation produced the desired targets 5a-b in good overall yields.These two stereo-isomers, 5a-b, were then used for the preparation of four stereoisomers of the closely related and biologically relevant cyclic tetrapeptide diheteropeptin 1. A syn-selective reduction of the hydroxyketones 5a-b with lithium tri-tert-butoxyaluminium hydride produced the syn-isomers 1a and 1c, whereas an anti-selective reduction with lithium triethylborohydride produced the pseudo-enantiomeric targets 1b and 1d with similar yield and selectivity. Thus, an ensemble of six cyclic tetrapeptides with stereochemical diversity was generated from the common template 8 in two-three steps.

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一种天然环四肽的两种立体异构体和四种二异肽的后期支架分化合成
通过环肽支架的后期多样化,已经开发出一种简洁的合成途径,可以获得具有生物学吸引力的天然环四肽的两个立体异构体5a-b。该模板与对映体乳酸甲酯10制备的烯烃9a-b发生交叉复合反应,生成α,β-不饱和酮7a-b,随后加氢生成所需目标5a-b,总体产率较高。这两个立体异构体,5a-b,然后用于制备密切相关的和生物相关的环四肽二异肽1的四个立体异构体。用三叔丁基氢化铝锂对羟基酮5a-b进行同步选择性还原得到了同分异构体1a和1c,而用三乙基硼氢化锂进行反选择性还原得到了伪对映体1b和1d,产率和选择性相似。因此,从共同模板8中通过两三个步骤生成了具有立体化学多样性的六个环四肽的集合。
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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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