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1.
Angew Chem Int Ed Engl ; 63(9): e202317636, 2024 Feb 26.
Artigo em Inglês | MEDLINE | ID: mdl-38242844

RESUMO

The first total synthesis of incarnatapeptins A and B, two novel marine natural products, was accomplished from readily available (S)-1-benzyloxycarbonylhexahydropyridazine-3-carboxylic acid. This route, whose longest linear sequence was 12 steps, provided the incarnatapeptins A and B in yields of 26.5 % and 19.7 %, respectively, and enabled the structure and stereochemistry of both natural products to be unambiguously confirmed. Highlights of our synthesis include the photoredox-mediated decarboxylative 1,4-addition reaction and a novel and practical N-acylation paradigm promoted by silver carbonate. The unusual facile atropisomerism of some linear peptidic intermediates was also observed by TLC analysis in the course of this work.

2.
Angew Chem Int Ed Engl ; 59(31): 12832-12836, 2020 07 27.
Artigo em Inglês | MEDLINE | ID: mdl-32329945

RESUMO

A concise and asymmetric total synthesis of five kopsane alkaloids that share a unique heptacyclic caged ring system was accomplished. The key transformation in the sequence involved a remarkable PtCl2 -catalyzed intramolecular [3+2] cycloaddition, which allowed for the rapid assembly of pentacyclic carbon skeletons bearing 2,3-quaternary functionalized indoline. Expeditious construction of diverse indoline scaffolds with excellent control of diastereoselectivity demonstrated the broad scope and versatility of this key transformation.


Assuntos
Alcaloides Indólicos/síntese química , Catálise , Reação de Cicloadição , Compostos de Platina/química , Estereoisomerismo
3.
Org Lett ; 18(15): 3914-7, 2016 08 05.
Artigo em Inglês | MEDLINE | ID: mdl-27463262

RESUMO

2-Cyclopentenone derivatives have been efficiently synthesized from 5-bromo-5-hexen-2-ones via palladium-catalyzed intramolecular carbonyl α-alkenylation followed by double-bond migration under mild reaction conditions.

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