期刊
JOURNAL OF ORGANIC CHEMISTRY
卷 87, 期 1, 页码 429-452出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.joc.1c02455
关键词
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资金
- National Natural Science Foundation of China General Fund [21672179]
- HKU Seed Funding for Basic Research
- Laboratory for Synthetic Chemistry and Chemical Biology under the Health@InnoHK Program
- University of Hong Kong
- State Key Laboratory of Synthetic Chemistry
The copper-catalyzed reductive Ireland-Claisen rearrangement led to the synthesis of diastereomeric products with divergent selectivity, utilizing silanes or pinacolborane as reducing agents and triethylphosphite as a ligand. The mechanism studies showed that silyl and boron enolates underwent a stereospecific rearrangement via a chairlike transition state to afford the Claisen rearrangement products.
The copper-catalyzed reductive Ireland-Claisen rearrangement of propargylic acrylates led to 3,4-allenoic acids. The use of silanes or pinacolborane as stoichiometric reducing agents and triethylphosphite as a ligand facilitated the divergent and complementary selectivity for the synthesis of diastereomeric anti- and syn-rearranged products, respectively. Copper-catalyzed reductive Ireland-Claisen rearrangement of allylic 2,3-allenoates proceeded effectively only when pinacolborane was used as a reductant to generate various 1,5-dienes in excellent yields and with good diastereoselectivities in some cases. Mechanistic studies showed that the silyl and boron enolates, rather than the copper enolate, underwent a stereospecific rearrangement via a chairlike transition state to afford the corresponding Claisen rearrangement products.
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