期刊
ACS CATALYSIS
卷 11, 期 14, 页码 8527-8537出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.1c01483
关键词
fluoroalkyl N-triftosylhydrazones; asymmetric [2+1] cycloaddition; cyclopropene; cyclopropane; low temperature
资金
- NSFC [21871043, 21961130376]
- Department of Science and Technology of Jilin Province [20180101185JC, 20190701012GH]
- Fundamental Research Funds for the Central Universities [2412019ZD001]
The development of asymmetric [2+1] cycloadditions using fluoroalkyl-aryl ketone N-triftosylhydrazones as diazo surrogates provides high yields and enantioselectivity, with broad functional group tolerance. The products obtained feature a unique fluoroalkyl chiral quaternary carbon center. The origin of enantioselectivity was rationalized by density functional theory calculations.
The development of asymmetric carbene transfer reactions using N-sulfonylhydrazones as the diazo surrogate is a long-term issue in organic synthesis since N-sulfonylhydrazones commonly require high temperatures for their decomposition to release reactive diazo compounds. We report on the use of fluoroalkyl-aryl ketone N-triftosylhydrazones as a class of N-sulfonylhydrazone capable of decomposing below 0 degrees C (to -40 degrees C). Their application in asymmetric [2 + 1] cycloadditions with alkynes and alkenes catalyzed by a chiral rhodium catalyst is described. This protocol affords a wide variety of fluoroalkylated cyclopropenes and cyclopropanes in high yields and high enantioselectivity and demonstrates broad functional group tolerance. It is noteworthy that these small-ring products feature a fluoroalkyl chiral quaternary carbon center. The origin of enantioselectivity for the cyclopropenation reaction of N-triftosylhydrazones with alkynes was rationalized by density functional theory calculations.
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