A Widely Applicable Chiral Auxiliary, <i>cis</i>-2-Amino-3,3-dimethyl-1-indanol: Conversion to a Novel Phosphorus-Containing Oxazoline and Its Application as a Highly Efficient Ligand for the Palladium-Catalyzed Enantioselective Allylic Amination Reaction
作者:Atsushi Sudo、Kazuhiko Saigo
DOI:10.1021/jo970359e
日期:1997.8.1
A chiral amino alcohol, cis-2-amino-3,3-dimethyl-1-indanol (2), was converted into the corresponding enantiomerically pure phosphorus-containing oxazoline 4. Oxazoline 4 was found to be an efficient ligand for palladium-catalyzed enantioselective allylic amination reactions: In the amination reaction of (E)-1,3-diphenyl-2-propen-1-yl acetate (7a), 4 was found to be more efficient than the similar ligands 1a-c, derived from valinol, tert-leucinol, etc. Other 1,3-bis(p-substituted aryl)-2-propen-1-yl acetates were also converted to the corresponding amines in a similar manner and with excellent enantioselectivity. In the amination reaction of 1-alkyl-3,3-diphenyl-2-propen-1-yl acetates 11, the correponding amines 12 were obtained with excellent enantioselectivity when acetic acid was added to the reaction system.
Organocatalytic α-Allylation of α-Branched Aldehydes by Synergistic Catalysis of Brønsted Acids and Amines
作者:Filip Stanek、Maciej Stodulski
DOI:10.1002/ejoc.201600725
日期:2016.10
Herein, we describe the first, fully organocatalytic Tsuji–Trost-type direct α-allylation of α-branched aldehydes by the combined use of N-triflyl amides and secondary amines. Aliphatic, aromatic aldehydes as well as allyl alcohols are converted into the corresponding α-allylated products in moderate to high yields.
Solution phase synthesis of a spiro[pyrrolidine-2,3′-oxindole] library via a three component 1,3-dipolar cycloaddition reaction
作者:Demosthenes Fokas、William J. Ryan、David S. Casebier、David L. Coffen
DOI:10.1016/s0040-4039(98)00234-2
日期:1998.4
A combinatorial library of 26,500 spiro[pyrrolidine-2,3′-oxindoles] was prepared in a single-compound format by a facile intermolecular 1,3-dipolarcycloaddition. An azomethine ylide, generated by the decarboxylative condensation of an isatin 1 with an α-amino acid 2, was trapped by a trans-chalcone3 to afford heterocycles of the general structure 4. The regio- and stereochemistry of a representative