Enantioselective Michael Addition of Aldehydes to β-Nitrostyrenes Catalyzed by (S)-<i>N</i>
-(D-Prolyl)-1-triflicamido-3-phenylpropan-2-amine
作者:Amol B. Gorde、Ramesh Ramapanicker
DOI:10.1002/ejoc.201900719
日期:2019.8.7
A D‐prolinamide containing a triflicamide group as the H‐bond donor was developed to catalyze the asymmetricMichaeladdition of β‐nitroalkenes with aldehydes. Very high enantioselectivity and yields are achieved using 10 mol% of the catalyst at r.t. in toluene.
Unusual anti-selectivity was observed in the conjugate addition of aldehydes to nitroalkenes, when a biphenyl-based chiralsecondaryamine was used as catalyst.
当使用联苯基手性仲胺作为催化剂时,在醛与硝基烯烃的共轭加成中观察到了异常的抗选择性。
<scp>d</scp>-Prolyl-2-(trifluoromethylsulfonamidopropyl)pyrrolidine: An Organocatalyst for Asymmetric Michael Addition of Aldehydes to β-Nitroalkenes at Ambient Conditions
作者:Amol B. Gorde、Ramesh Ramapanicker
DOI:10.1021/acs.joc.8b02945
日期:2019.2.1
yrrolidines and their d-prolinamides were prepared and screened as organocatalysts for the Michael addition reaction of aldehydes with β-nitroalkenes at rt and without the use of additives. d-Prolyl-2-(trifluoromethylsulfonamidopropyl)pyrrolidine was found to be the best among the molecules studied, which yielded γ-nitro aldehydes in very high yields (up to 95%), with high diastereoselectivity (up
We report a synthetic strategy for construction of the first example of organocatalytic covalent organic frameworks via pore surface engineering. The COF catalyst combines a number of striking features, including enhanced activity, broad applicability, good recyclability, and high capability, to perform catalytic transformation under continuous flow conditions.
A new series of hybrid dipeptide‐like organocatalysts based on pyranoid ϵ‐ or ζ‐amino acids and proline have been prepared for the asymmetric Michael addition of aldehydes to β‐nitrostyrenes. The reaction proceeds under mild conditions to afford a wide range of γ‐nitroaldehydes with up to 98% yield and up to 96% ee. These dipeptides are bifunctional organocatalysts, with a proline at the N‐terminus