Primary Amine/(+)-CSA Salt-Promoted Organocatalytic Conjugate Addition of Nitro Esters to Enones
作者:Chen Liu、Yixin Lu
DOI:10.1021/ol1006407
日期:2010.5.21
The combination of 9-amino-9-deoxy-epi-cinchonine and (+)-CSA resulted in a novelprimary amine-based organocatalyst for effective iminium activation of α,β-unsaturated ketones. Such a catalytic system could catalyze the conjugateaddition of nitroacetate to enones in a highly enantioselective manner, affording the desired adducts in high yields and with up to 99% ee.