Highly Enantio- and Diastereoselective Hetero-Diels-Alder Reactions Catalyzed by New Chiral Tridentate Chromium(III) Catalysts
摘要:
Even moderately nucleophilic dienes react with simple aldehydes in the presence of a new Cr(III) catalyst in a hetero-Diels-Alder reaction [Eq. (1)]. Tetrahydropyranyl products with up to three stereogenic centers are generated in near-perfect diastereoselectivities and with greater than 90 % ee (99 % ee for the example shown). TBAF=tetrabutylammonium fluoride; TBS=tert-butyldimethylsilyl; TES=triethylsilyl.
The present invention relates to a process for stereoselective cycloaddition reactions which generally comprises a cycloaddition reaction between a pair of substrates, each either chiral or prochiral, that contain reactive &pgr;-systems, in the presence of a non-racemic chiral catalyst, to produce a stereoisomerically enriched product. The present invention also relates to novel asymmetric catalyst complexes comprising a metal and an asymmetric tridentate ligand.
FR901464: Total Synthesis, Proof of Structure, and Evaluation of Synthetic Analogues
作者:Christopher F. Thompson、Timothy F. Jamison、Eric N. Jacobsen
DOI:10.1021/ja016615t
日期:2001.10.1
The natural product FR901464 (1) was isolated by the Fujisawa Pharmaceutical Co. and shown to have intriguing biological properties including impressive antitumor activity. In this paper we describe the first totalsynthesis of 1 in full detail. A chiral building block synthetic strategy was used to assemble the target: optically active components were generated using asymmetric catalytic reactions
CYCLIC ETHER COMPOUNDS USEFUL AS KINASE INHIBITORS
申请人:Burger Matthew
公开号:US20130109682A1
公开(公告)日:2013-05-02
The present invention provides certain compounds of Formula (I):
and pharmaceutically acceptable salts thereof, as further described herein. Also provided are formulations comprising compounds of formula I, and a method to use such compounds for treating a disease or condition mediated by Provirus Integration of Maloney Kinase (PIM Kinase), GSK3, PKC, KDR, PDGFRa, FGFR3, FLT3, or cABL.
A Two-Directional Approach to a (−)-Dictyostatin C11−C23 Segment: Development of a Highly Diastereoselective, Kinetically-Controlled Meerwein−Ponndorf−Verley Reduction
作者:Andrew K. Dilger、Vijay Gopalsamuthiram、Steven D. Burke
DOI:10.1021/ja077336u
日期:2007.12.1
A three-step synthesis of a precursor to the C11-C23 segment of (-)-dictyostatin is described. The sequence features a sonication-assisted, enantioselective double hetero Diels-Alder (HDA) reaction catalyzed by Jacobsen's Cr(III) Schiff base catalyst, followed by a novel, highly diastereoselective Meerwein-Ponndorf-Verley (MPV) reduction of the hydropyranone subunits under kinetic control to yield the bis(axial alcohol) 4. Generalized studies of both the HDA and MPV methodologies are also described.
A New Dirhodium(II) Carboxamidate Complex as a Chiral Lewis Acid Catalyst for Enantioselective Hetero-Diels–Alder Reactions