Journal
ORGANIC LETTERS
Volume 23, Issue 19, Pages 7656-7660Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.orglett.1c02916
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Funding
- NIH [5R01GM12592004]
- NSF MRI [1920234]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1920234] Funding Source: National Science Foundation
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This method utilizes a cascade cocatalysis strategy to achieve the easy construction of chiral gamma, gamma-disubstituted butenolides, showing good generality and effectiveness.
Herein we report a cascade cocatalysis strategy for the facile construction of chiral gamma,gamma-disubstituted butenolides. The synthetic manifold employs simple alkynoic acids instead of the preformed silyloxy furans or 5-substituted furan-2(3H)-ones. In situ formed 5-substituted furan-2(3H)-ones by AgNO3 or Ph3PAuCl/AgOTf catalyzed cyclization of alkynoic acids can smoothly engage in the subsequent chiral diphenylprolinol TMS-ether catalyzed Michael and Michael-aldol reactions. The cascade process serves as a general approach to chiral quaternary gamma,gamma-disubstituted butenolides.
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