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Enantioselective Synthesis of Chromans with a Quaternary Stereogenic Centre through Catalytic Asymmetric Cascade Reactions
被引:13
作者:
Hua, Qiu-Lin
[1
]
Li, Chao
[1
]
Wang, Xu-Fan
[1
]
Lu, Liang-Qiu
[1
]
Chen, Jia-Rong
[1
]
Xiao, Wen-Jing
[1
]
机构:
[1] Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticide & Chem Biol, Wuhan 430079, Hubei, Peoples R China
来源:
ACS CATALYSIS
|
2011年
/
1卷
/
03期
基金:
美国国家科学基金会;
关键词:
organocatalysis;
cascade reaction;
Michael addition;
heterocycle;
chromans;
DOUBLE-MICHAEL ADDITION;
N-HETEROCYCLES;
CONJUGATE ADDITION;
SULFUR YLIDES;
ALPHA;
BETA-UNSATURATED KETONES;
COUMARIN DERIVATIVES;
NATURAL-PRODUCTS;
CHIRAL CHROMANS;
VITAMIN-E;
THIOUREA;
D O I:
10.1021/cs100161k
中图分类号:
O64 [物理化学(理论化学)、化学物理学];
学科分类号:
070304 ;
081704 ;
摘要:
A highly enantioselective cascade reaction of benzotriazoles with nitroolefin-cotaining enonates catalyzed by a base/acid bifunctional organocatalyst has been developed. This cascade sequence affords efficient access to densely functionalized chiral chromans with a quaternary stereogenic center in high yield (up to 91%) with excellent enantioselectivity (up to 96% ee) and diastereoselectivity (up to 96:4 dr). The reaction itself features simple experimental procedures under benign conditions and is completely atom economic in character.
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页码:221 / 226
页数:6
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