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Access to Enantiopure Triarylmethanes and 1,1-Diarylalkanes by NHC-Catalyzed Acylative Desymmetrization
被引:36
|作者:
Lu, Shenci
[1
]
Song, Xiaoxiao
[1
]
Poh, Si Bei
[1
]
Yang, Hui
[1
]
Wong, Ming Wah
[1
]
Zhao, Yu
[1
]
机构:
[1] Natl Univ Singapore, Dept Chem, 3 Sci Dr 3, Singapore 117543, Singapore
基金:
新加坡国家研究基金会;
关键词:
1,1-diarylalkanes;
acylation;
carbenes;
desymmetrization;
N-heterocycles;
CROSS-COUPLING REACTIONS;
DYNAMIC KINETIC RESOLUTION;
N-HETEROCYCLIC CARBENES;
BARRIER HYDROGEN-BONDS;
ASYMMETRIC-SYNTHESIS;
ESTERS;
ALCOHOLS;
DIARYLMETHYLAMINES;
CONSTRUCTION;
SELECTIVITY;
D O I:
10.1002/chem.201605445
中图分类号:
O6 [化学];
学科分类号:
0703 ;
摘要:
We present herein an unprecedented, efficient and enantioselective synthesis of triarylmethanes and 1,1-diarylalkanes through N-heterocyclic carbene-catalyzed acylative desymmetrization of bisphenols. This method utilizes readily available substrates, reagents and a simple procedure to deliver the valuable products in excellent enantiopurity. DFT calculations reveal that the selectivity is governed by the C-C bond cleavage step of the tetrahedral intermediate leading to the ester product. A transition state model featuring a combination of intramolecular hydrogen bond and steric effect is developed to explain the enantioselectivity.
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页码:2275 / 2281
页数:7
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