Enantioselective 1,4-addition of kojic acid derivatives to β-nitroolefins catalyzed by a cinchonine derived sugar thiourea
作者:B. V. Subba Reddy、S. Madhusudana Reddy、Manisha Swain、Srikanth Dudem、Shasi V. Kalivendi、C. Suresh Reddy
DOI:10.1039/c3ra47423b
日期:——
A highly enantioselective Michael addition reaction of kojic acid derivatives to β-nitroolefins has been accomplished using a cinchonine derived sugar thiourea. The reaction provides the corresponding Michael adducts in excellent yields with a high degree of enantioselectivity (up to 99% ee) in short reaction time with low catalyst loading. The Michael adducts are found to exhibit promising cytotoxicity
By employing a chiral bifunctional thiourea–tertiary amine as catalyst, enantioselectiveMichaeladdition of a kojic acid derivative to nitro olefins was realised. The reactions afforded the products with good yields (up to 99%) in good enantioselectivities (up to 97% ee). In addition, the absolute configuration of one product was determined.