HIGHLY ENANTIOSELECTIVE MICHAEL ADDITION OF THIOLS TO 2-CYCLOHEXENONE BY USING (2S,4S)-2-(ANILINOMETHYL)-1-ETHYL-4-HYDROXYPYRRQLIPINE AS A CHIRAL CATALYST
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چکیده
منابع مشابه
Highly enantioselective Michael addition reactions of 2-substituted benzofuran-3(2H)-ones to nitroolefins.
A highly enantioselective Michael addition reaction of 2-substituted benzofuran-3(2H)-ones to nitroolefins was promoted by a bifunctional squaramide catalyst. As a result, a number of chiral 2,2'-substituted benzofuran-3-one derivatives, bearing adjacent quaternary-tertiary stereocenters, were efficiently synthesized with excellent enantioselectivities.
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An efficient highly diastereo- and enantioselective direct Michael addition of nitroalkanes to nitroalkenes catalyzed by chiral squaramide catalyst has been developed. This organocatalytic reaction with a low catalyst loading (2 mol%) proceeded well to afford synthetically useful 1,3-dinitro compounds in high yields with high diastereoselectivities (up to 95 : 5 dr) and excellent enantioselecti...
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The diastereo- and enantioselective direct vinylogous Michael addition reaction of γ-substituted butenolides to 2-enoylpyridines has been achieved. A range of γ,γ-disubstituted butenolide derivatives, bearing two consecutive tri- and tetrasubstituted stereogenic centers, were readily obtained in good yields with excellent stereoselectivities (up to >99 : 1 dr and >99% ee).
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ژورنال
عنوان ژورنال: Chemistry Letters
سال: 1981
ISSN: 0366-7022,1348-0715
DOI: 10.1246/cl.1981.165