Asymmetric Mannich Reaction of Malonates with Aldimines Using Yb<sup>III</sup>-Pybox Complexes Supported on Self-Assembled Organic-Inorganic Hybrid Silica with an Imidazolium Framework
作者:Babak Karimi、Ehsan Jafari、Dieter Enders
DOI:10.1002/ejoc.201402713
日期:2014.11
and recyclable catalyst in the enantioselective Mannich reaction of malonateesters with N-Boc aldimines to afford the corresponding products in good yields and enantioselectivities. In particular, it has been shown that the use of catalyst A resulted in much superior enantioselectivities in comparison with either 1:2 Yb(OTf)3/3b on a periodicmesoporousorganosilica with 10 percent imidazolium framework
Cooperative Assistance in Bifunctional Organocatalysis: Enantioselective Mannich Reactions with Aliphatic and Aromatic Imines
作者:Nicolas Probst、Ádám Madarász、Arto Valkonen、Imre Pápai、Kari Rissanen、Antti Neuvonen、Petri M. Pihko
DOI:10.1002/anie.201203852
日期:2012.8.20
bifunctional thiourea catalysts containing an activating intramolecular hydrogen bond were redesigned. The new catalysts were used to effect a highly enantioselective Mannich reaction between malonates and both aliphatic and aromaticimines (see scheme; Boc=tert‐butoxycarbonyl).