Primary-tertiary diamine-catalyzed Michael addition of ketones to isatylidenemalononitrile derivatives
作者:Akshay Kumar、Swapandeep Singh Chimni
DOI:10.3762/bjoc.10.91
日期:——
Simple primary-tertiary diamines easily derived from natural primary aminoacids were used to catalyze the Michael addition of ketones with isatylidenemalononitrile derivatives. Diamine 1a in combination with D-CSA as an additive provided Michael adducts in high yield (up to 94%) and excellent enantioselectivity (up to 99%). The catalyst 1a was successfully used to catalyze the three-component version
<scp>l</scp>-Proline-Grafted Mesoporous Silica with Alternating Hydrophobic and Hydrophilic Blocks to Promote Direct Asymmetric Aldol and Knoevenagel–Michael Cascade Reactions
作者:Zhe An、Ying Guo、Liwei Zhao、Zhi Li、Jing He
DOI:10.1021/cs500385s
日期:2014.8.1
enantioselectivity in the directaldolreaction and the Knoevenagel–Michael cascade reaction. The l-proline loading could be reduced to as low as 0.63 mol %, giving 95% ee for anti-isomers and 81% ee for syn-isomers in the catalytic asymmetricaldolreaction of nitrobenzaldehyde and cyclohexanone, which was hard to accomplish on the homogeneous counterpart. In the directasymmetricaldolreaction of ethyl-2-oxoacetate
Organocatalytic enantioselective conjugate addition of ketones to isatylidine malononitriles
作者:Lu Liu、Deyan Wu、Xiangmin Li、Sinan Wang、Hao Li、Jian Li、Wei Wang
DOI:10.1039/c2cc17067a
日期:——
An enantioselective Michael addition of ketones to alkylidenemalononitriles catalyzed by chiral primary amine I with (R)-5c as a co-catalyst in good yields (>90%) and with good enantioselectivities (85–96% ee) has been developed. The strategy has also been extended to a three-component version through a domino Knoevenagel/Michael sequence with similar or better outcomes.