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通过电化学环化全合成龙霉素A - C

Total Synthesis of Dragocins A-C through Electrochemical Cyclization.

作者信息

Smith Brendyn P, Truax Nathanyal J, Pollatos Alexandros S, Meanwell Michael, Bedekar Pranali, Garrido-Castro Alberto F, Baran Phil S

机构信息

Department of Chemistry, Scripps Research, 10550 N. Torrey Pines Road, La Jolla, California 92037, United States.

Department of Chemistry, University of Alberta, 11227 Saskatchewan Dr NW, Edmonton, AB T6G 2N4, Canada.

出版信息

Angew Chem Int Ed Engl. 2024 May 6;63(19):e202401107. doi: 10.1002/anie.202401107. Epub 2024 Mar 28.

DOI:10.1002/anie.202401107
PMID:38358802
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11619770/
Abstract

The first total synthesis of dragocins A-C, remarkable natural products containing an unusual C4' oxidized ribose architecture bridged by a polyhydroxylated pyrrolidine, is presented through a route featuring a number of uncommon maneuvers. Several generations towards the target molecules are presented, including the spectacular failure of a key C-H oxidation on a late-stage intermediate. The final route features rapid, stereocontrolled access to a densely functionalized pyrrolidine and an unprecedented diastereoselective oxidative electrochemical cyclization to forge the hallmark 9-membered ring. Preliminary studies suggest this electrochemical oxidation protocol is generally useful.

摘要

本文报道了dragoicins A-C的首次全合成,这是一类引人注目的天然产物,含有由多羟基化吡咯烷桥连的不寻常的C4'氧化核糖结构,合成路线采用了一系列不同寻常的操作。展示了向目标分子合成的几个阶段,包括后期中间体上关键的C-H氧化反应的惊人失败。最终路线的特点是能够快速、立体控制地合成一个高度官能化的吡咯烷,并通过前所未有的非对映选择性氧化电化学环化反应形成标志性的九元环。初步研究表明,这种电化学氧化方法具有普遍适用性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d214/11619770/9272118e2220/nihms-2037972-f0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d214/11619770/c951f5171147/nihms-2037972-f0001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d214/11619770/335d0dab00be/nihms-2037972-f0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d214/11619770/9272118e2220/nihms-2037972-f0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d214/11619770/c951f5171147/nihms-2037972-f0001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d214/11619770/335d0dab00be/nihms-2037972-f0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d214/11619770/9272118e2220/nihms-2037972-f0003.jpg

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