期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 144, 期 3, 页码 1099-1105出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.1c11497
关键词
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资金
- JSPS KAKENHI [JP21H04682]
- MEXT, Japan [JP18H04649, JP20H04828]
- JSPS Research Fellowship for Young Scientists [JP20J10287]
This study demonstrates that acylsilanes can serve as a source of electron-rich carbenes under palladium catalysis, enabling the cyclopropanation of alkenes. This new reactivity profile provides a valuable method for accessing elaborate beta-functionalized ketones.
Currently, catalytically transferable carbenes are limited to electron-deficient and neutral derivatives, and electron-rich carbenes bearing an alkoxy group (i.e., Fischer-type carbenes) cannot be used in catalytic cyclopropanation because of the lack of appropriate carbene precursors. We report herein that acylsilanes can serve as a source of electron-rich carbenes under palladium catalysis, enabling cyclopropanation of a range of alkenes. This reactivity profile is in sharp contrast to that of metal-free siloxycarbenes, which are unreactive toward normal alkenes. The resulting siloxycyclopropanes serve as valuable homoenolate equivalents, allowing rapid access to elaborate beta-functionalized ketones.
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