Enantioselective Mannich Reactions with the Practical Proline Mimetic <i>N</i>-(<i>p</i>-Dodecylphenyl-sulfonyl)-2-pyrrolidinecarboxamide
作者:Hua Yang、Rich G. Carter
DOI:10.1021/jo8027938
日期:2009.3.6
highly enantioselective and diastereoselective protocol for performing Mannichreactions has been developed by using a p-dodecylphenylsulfonamide-based proline catalyst. This catalyst facilitates the use of common, nonpolar solvents and increased concentrations as compared to alternative methods. A series of syn-selective Mannichreactions is reported, including the rapid access of α- and β-amino acids surrogates
The Direct Catalytic Asymmetric Cross-Mannich Reaction: A Highly Enantioselective Route to 3-Amino Alcohols andα-Amino Acid Derivatives
作者:Armando Córdova
DOI:10.1002/chem.200305646
日期:2004.4.19
The first proline-catalyzed direct catalytic asymmetricone-pot, three-component cross-Mannich reaction has been developed. The highly chemoselective reactions between two different unmodified aldehydes and one aromatic amine are new routes to 3-amino aldehydes with dr>19:1 and up to >99 % ee. The asymmetric cross-Mannich reactions are highly syn-selective and in several cases the two new carbon centers
The Direct Organocatalytic Asymmetric Mannich Reaction: Unmodified Aldehydes as Nucleophiles
作者:Wolfgang Notz、Fujie Tanaka、Shin-ichi Watanabe、Naidu S. Chowdari、James M. Turner、Rajeswari Thayumanavan、Carlos F. Barbas
DOI:10.1021/jo0347359
日期:2003.12.1
The unprecedented application of unmodified aldehydes as nucleophilic donors in direct catalytic asymmetricMannich-typereactions is disclosed in a full account. Our efforts in broadening the applicability of chiral pyrrolidine-based catalysts in direct asymmetricMannich-typereactions led to the highly diastereo- and enantioselective and concise synthesis of functionalized alpha- and beta-amino
One-Pot Organocatalytic Direct Asymmetric Synthesis of γ-Amino Alcohol Derivatives
作者:Armando Córdova
DOI:10.1055/s-2003-41423
日期:——
This report describes the unprecedented use of unmodified aldehydes as donors in catalytic three component one-pot asymmetric Mannich reactions. The Mannich-type reactions were also readily performed for the first time with both in situ generated and preformed N-PMP protected aromatic aldimines. The proline-catalyzed reactions provided an efficient and very mild entry to either enantiomer of γ-amino alcohol derivatives in high yield and stereoselectivity.