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
The Michael Addition of Active Methylene Compounds to Chalcone Derivatives using a Catalytic Amount of Iodine and K<sub>2</sub>CO<sub>3</sub> at Room Temperature
作者:Yi-Ming Ren、Chun Cai
DOI:10.3184/174751911x12984726527461
日期:2011.3
A convenient method for the Michael addition of activemethylenecompounds to chalcone derivatives has been developed using the inexpensive and environmentally friendly reagent I2/K2CO3 at room temperature. The method is mild and proceeds with good to high yields.
Natural Phosphate Modified with Lithium Nitrate: A New Efficient Catalyst for the Construction of Carbon–Carbon, Carbon–Sulfur, and Carbon–Nitrogen Bonds
of small amounts of lithium nitrate to natural phosphate followed by calcination gives a new catalyst Li/NP (weight ratio LiNO3/NP = 1/15). This material showed catalytic activity in the Michael addition of amines, mercaptans, and activemethylenecompounds to chalcone derivatives with high yields under mild reaction conditions. Li/NP is used as the catalyst for a facile synthesis of β-amino acids,