The Mannich Reaction of Malonates with Simple Imines Catalyzed by Bifunctional Cinchona Alkaloids: Enantioselective Synthesis of β-Amino Acids
作者:Jun Song、Yi Wang、Li Deng
DOI:10.1021/ja060716f
日期:2006.5.1
efficient, direct asymmetric Mannichreactions with malonates and N-Boc aryl and alkyl imines by cooperative hydrogen-bonding catalysis with a cinchona alkaloid bearing a thiourea functionality. We have also extended the scope of this reaction to beta-ketoesters. The synthetic value of this new reaction is demonstrated in the establishment of a convergent enantioselective route toward the biologically
Asymmetric Mannich Reaction of Fluorinated Ketoesters with a Tryptophan-Derived Bifunctional Thiourea Catalyst
作者:Xiao Han、Jacek Kwiatkowski、Feng Xue、Kuo-Wei Huang、Yixin Lu
DOI:10.1002/anie.200903635
日期:2009.9.28
Fluorinated quaternary stereocenters: A novel bifunctionalcatalyst 1 derived from natural tryptophan promoted the Mannichreaction of α‐fluoro‐β‐ketoesters to afford fluorinated chiral molecules containing vicinal quaternary and tertiary stereogenic centers with exceptional enantioselectivity. An unprecedented α‐fluoro‐β‐lactam was also prepared by this method (see scheme; Boc=tert‐butoxycarbonyl)
Highly Efficient Catalytic Enantioselective Mannich Reaction of Malonates with<i>N</i>-<i>tert</i>-Butoxycarbonyl Imines by Using Yb(OTf)<sub>3</sub>/Pybox Catalysts at Room Temperature
作者:Babak Karimi、Ehsan Jafari、Dieter Enders
DOI:10.1002/chem.201300241
日期:2013.7.29
Go Mannich! A highly efficient and enantioselective method for the direct asymmetric reaction of dibenzyl malonate with N‐tert‐butoxycarbonyl aldimines in the presence of Yb(OTf)3 and iPr‐pybox complexes is described (see scheme; pybox=pyridine bisoxazoline).
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
Chiral Calcium Iodide for Asymmetric Mannich-type Reactions of Malonates with Imines Providing β-Aminocarbonyl Compounds
作者:Tetsu Tsubogo、Shota Shimizu、Shū Kobayashi
DOI:10.1002/asia.201300102
日期:2013.5
catalytic asymmetric Mannich‐type reactions of malonates with both N‐Boc‐protected aromatic and aliphatic imines, and resulted in moderate to high yields with high enantioselectivities. To the best of our knowledge, this is the first example of highly enantioselective metal‐catalyzed asymmetric Mannich‐type reactions of malonates with N‐Boc‐protected aliphatic imines. The Mannich adduct was successfully