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Enantioselective chlorinative aldol reaction of α-substituted acroleins catalyzed by chiral phosphine oxides
被引:5
|作者:
Kotani, Shunsuke
[1
,2
]
Hanamure, Takuya
[1
]
Nozaki, Hirono
[1
]
Sugiura, Masaharu
[1
]
Nakajima, Makoto
[1
]
机构:
[1] Kumamoto Univ, Grad Sch Pharmaceut Sci, Chuo Ku, 5-1 Oe Honmachi, Kumamoto 8620973, Japan
[2] Kumamoto Univ, Prior Org Innovat & Excellence, Chuo Ku, 5-1 Oe Honmachi, Kumamoto 8620973, Japan
关键词:
TANDEM CONJUGATE ADDITION;
ALPHA;
BETA-ACETYLENIC KETONES;
1,4-ADDITION-ALDOL REACTION;
TRICHLOROSILYL TRIFLATE;
TERTIARY AMINE;
ALLENIC ESTERS;
HYDRIDE DONOR;
LEWIS-BASES;
ALDEHYDES;
COMPLEXES;
D O I:
10.1016/j.tetasy.2017.01.006
中图分类号:
O61 [无机化学];
学科分类号:
070301 ;
081704 ;
摘要:
The enantioselective chlorinative aldol reaction of a-substituted acroleins with aldehydes catalyzed by chiral phosphine oxides is described. A hypervalent silicon complex-derived chloride adds to the alpha-substituted acroleins to form the corresponding silyl enol ethers in situ, which subsequently reacts with aldehydes to produce the alpha-chloromethyl aldol adducts bearing a quaternary stereogenic center in good yields and stereoselectivities. When activated by a phosphine oxide catalyst, trichlorosilyl triflate acts as an effective promoter for the chlorinative aldol reaction as well as the chloride source; this discovery enabled the enantioselective chlorinative aldol reaction of alpha-substituted acroleins. (C) 2017 Elsevier Ltd. All rights reserved.
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页码:282 / 287
页数:6
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