Enantioselective Pd-Catalyzed Decarboxylative Allylic
Alkylation of Thiopyranones. Access to Acyclic, Stereogenic α‑Quaternary
Ketones
Version 2 2017-09-14, 12:48
Version 1 2017-09-13, 13:51
Posted on 2017-09-14 - 12:48
A catalytic, enantioselective
decarboxylative allylic alkylation
of 4-thiopyranones is reported. The α-quaternary 4-thiopyranones
produced are challenging to access by standard enolate alkylation
owing to facile ring-opening β-sulfur elimination. In addition,
reduction of the carbon–sulfur bonds provides access to elusive
acyclic α-quaternary ketones. The alkylated products are obtained
in up to 92% yield and 94% enantiomeric excess.
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Alexy, Eric J.; Virgil, Scott C.; Bartberger, Michael D.; Stoltz, Brian M. (2017). Enantioselective Pd-Catalyzed Decarboxylative Allylic
Alkylation of Thiopyranones. Access to Acyclic, Stereogenic α‑Quaternary
Ketones. ACS Publications. Collection. https://doi.org/10.1021/acs.orglett.7b02354
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AUTHORS (4)
EA
Eric J. Alexy
SV
Scott C. Virgil
MB
Michael D. Bartberger
BS
Brian M. Stoltz
KEYWORDS
alkylated productsAccessenantioselective decarboxylative allylic alkylation4- thiopyranonesaccessThiopyranoneenantiomericacyclic α- quaternary ketonesα- quaternary 4- thiopyranonesKetonering-opening β- sulfur eliminationQuaternaryAcyclicEnantioselective Pd-Catalyzed Decarboxylative Allylic AlkylationStereogenicenolate alkylationbond