A highly efficient strategy for the kinetic resolution of Michael adducts was realized using a chiral N‐heterocyclic carbene catalyst. The kinetic resolution provides a new convenient route to single diastereomers of cyclohexenes and Michael adducts in good yields with high enantiomeric excesses (up to 99 % ee with a selectivity factor of up to 458). This “two flies with one swat” concept allows the
Michael Addition of Active Methylene Compounds to α,β-Unsaturated Carbonyl Compounds under the Influence of Molecular Sieves in Dimethyl Sulfoxide
作者:Tomoko Kakinuma、Ryoichi Chiba、Takeshi Oriyama
DOI:10.1246/cl.2008.1204
日期:2008.12.5
The Michael addition of active methylene compounds to α,β-unsaturated carbonyl compounds in the presence of MS 4A in dimethyl sulfoxide proceeds smoothly to afford the corresponding 1,4-addition pr...
One‐Pot Sequential Synthesis of Fused Isoquinolines via Intramolecular Cyclization/Annulation and their Photophysical Investigation
作者:Amitava Rakshit、Prasenjit Sau、Subhendu Ghosh、Bhisma K. Patel
DOI:10.1002/adsc.201900543
日期:2019.8.21
1‐a]isoquinoline‐3‐carbonitrile. This one‐pot process is associated with the formation of one C−C, two C−N, two C=C and a C=O bonds. The final synthesis is a four‐step process consisting of selective hydrolysis of a cyano group to an amide, dehydrative cyclization of the amide to a cyclic amide, aromatization of the cyclic amide (2‐oxo‐1,2,3,4‐tetrahydropyridine moiety) to a 2‐oxo‐1,2‐dihydropyridine and finally
An efficient and convenient highly enantioselective Michaeladdition of malononitrile to enones has been developed by using quinine as the organocatalyst. The adducts were isolated in excellent yield and high asymmetric induction (up to 95% ee). An easy route to difficultly accessible ester derivatives has been also disclosed.
Highly enantioselective Michael addition of malononitrile to α,β-unsaturated ketones
作者:Xuefeng Li、Lingfeng Cun、Chunxia Lian、Ling Zhong、Yingchun Chen、Jian Liao、Jin Zhu、Jingen Deng
DOI:10.1039/b713129a
日期:——
The highly enantioselective Michael addition of malononitrile to acyclic and cyclic alpha,beta-unsaturated ketones has been developed. The Michaelreaction catalyzed by a primary amine derived from quinidine proceeded smoothly and provided the desired adducts with excellent enantioselectivities (83-97% ee).