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Efficient Enantioselective Michael Addition of Nitroalkenes Catalyzed by a Surfactant-Type Bifunctional Thiourea Organocatalyst in the Presence of Water
被引:8
|作者:
Li, Jian
[2
]
Liu, Yang
[3
]
Liu, Li
[1
]
机构:
[1] Chang Zhou Univ, Analyt Ctr, Changzhou 213164, Peoples R China
[2] Chang Zhou Univ, Sch Pharmaceut Engn & Life Sci, Changzhou 213164, Peoples R China
[3] Kaifeng Univ, Res Ctr Funct Mat, Kaifeng 475004, Peoples R China
关键词:
Bifunctional thiourea;
enantioselective michael addition;
organocatalysts;
surfactant-type;
water;
DIRECT ALDOL REACTIONS;
ALPHA;
BETA-UNSATURATED IMIDES;
ALDEHYDES;
NITROSTYRENES;
ACTIVATION;
KETONES;
D O I:
10.2174/157017812799304024
中图分类号:
O62 [有机化学];
学科分类号:
070303 ;
081704 ;
摘要:
New surfactant-type bifunctional thiourea organocatalysts 3 were synthesized. It was found that in the presence of 10 mol% PhCOOH, bifunctional thiourea bearing a long chain 3b in 10 mol% loading could smoothly catalyze the asymmetric Michael reaction of nitroalkenes 4 with cyclohexanone at room temperature in the presence of water, giving the desired adducts 5a-i in good yields (80 - 93%) with high diastereoselectivities (syn/anti = 95/5 - > 99/1) and enantioselectivities (up to 92% ee).
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页码:51 / 55
页数:5
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