C2-ketonylation of carbohydrates via excited-state palladium-catalyzed 1,2-spin-center shift.
Chem Sci
; 13(21): 6276-6282, 2022 Jun 01.
Article
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| MEDLINE
| ID: mdl-35733909
ABSTRACT
C2-ketonyl-2-deoxysugars, sugars with the C2-hydroxyl group replaced by a ketone side chain, are important carbohydrate mimetics in glycobiology and drug discovery studies; however, their preparation remains a vital challenge in organic synthesis. Here we report the first direct strategy to synthesize this class of glycomimetics from readily available 1-bromosugars and silyl enol ethers via an excited-state palladium-catalyzed 1,2-spin-center shift (SCS) process. This step-economic reaction features broad substrate scope, has a high functional group tolerance, and can be used in late-stage functionalization of natural product- and drug-glycoconjugates. Preliminary experimental and computational mechanistic studies suggested a non-chain radical mechanism involving photoexcited palladium species, a 1,2-SCS process, and a radical Mizoroki-Heck reaction.
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01-internacional
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MEDLINE
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En
Revista:
Chem Sci
Año:
2022
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Article