The intramolecular1,3-chiralitytransferreaction of chiral amino alcohols 1 with 99% ee was developed to construct chiral 1-substituted tetrahydroisoquinoline 2. Bi(OTf)3 (10 mol %)-catalyzed cyclization of 1 (R = H) afforded (S)-1-(E)-propenyl tetrahydroisoquinoline 2 (R = H) in 83% yield with a ratio of 98:2. The stereochemistry at the newly formed chiralcenter was produced by a syn SN2′-type
开展了手性氨基醇1与99%ee的分子内1,3-手性转移反应,构建了手性1取代的四氢异喹啉2。Bi(OTf)3(10 mol%)催化1的环化反应(R = H)得到(S)-1-(E)-丙烯基四氢异喹啉2(R = H),产率为83:2,比率为98:2 。在新形成的手性中心的立体化学是通过syn S N 2'型过程产生的。在该反应中,苯环1上的取代基显着影响反应性和选择性。提出了合理的反应机理。
The Development of Efficient Protocols for the Palladium-Catalyzed Cyclization Reactions of Secondary Amides and Carbamates
作者:Bryant H. Yang、Stephen L. Buchwald
DOI:10.1021/ol9905351
日期:1999.7.1
[formula: see text] With the proper choice of palladium catalyst, ligand, and base, five-, six-, and seven-membered rings are formed efficiently from secondary amide or secondary carbamate precursors, offering significant improvements to currently existing methodology.
A unique combination of copper iodide and cesium acetate was found to mediate intramolecular amination of arylhalides under mild conditions. The reaction proceeds at room temperature with primary or N-benzyl amines and at moderately elevated temperatures with other amine derivatives. The reaction has been applied to the formation of 5-, 6-, and 7-membered rings. Remarkably, halogens at the meta-position
The present invention relates to biaryl piperidine-based renin inhibitor compounds, and their use in treating cardiovascular events and renal insufficiency.