Diastereo- and Enantioselective Synthesis of Homoallylic Amines Bearing Quaternary Carbon Centers
作者:Jacob C. Green、Joseph M. Zanghi、Simon J. Meek
DOI:10.1021/jacs.9b11529
日期:2020.1.29
A Cu-catalyzed method for the efficient enantio- and diastereoselective synthesis of chiral homoallylic amines bearing a quaternary carbon and an alkenylboron is disclosed. Transformations are promoted by a readily prepared (phosphoramidite)-Cu complex, and involve bench-stable γ,γ,-disubstituted allyldiborons and benzyl imines; products are obtained in up to 82% yield, >20:1 dr, and >99:1 er. Reactions
Anderson, James C.; Peace, Simon; Pih, Steven, Synlett, 2000, # 6, p. 850 - 852
作者:Anderson, James C.、Peace, Simon、Pih, Steven
DOI:——
日期:——
Stereoselective synthesis of 4-substituted azetidine-2,3-diones by ring opening of 1,3-thiazolidine-derived spiro-β-lactams
作者:Giuseppe Cremonesi、Piero Dalla Croce、Francesco Fontana、Concetta La Rosa
DOI:10.1016/j.tetasy.2008.02.011
日期:2008.3
New 3-heterocycle substituted 1,3-thiazolidine-derived 4-spiro-beta-lactams with a relative trans-configuration were stereoselectively synthesised by means of a Staudinger ketene-imine reaction between the ketene generated from the (2S,4R)-1,3-thiazolidine-2,3,4-tricarboxylic acid 3-(1,1-dimethylethyl) 4-methyl ester 1 and imines 2b-e. The 1,3-thiazolidine-derived 4-spiro-beta-lactams were transformed into the corresponding enantiomerically pure 4-heterocycle substituted azetidine-2,3-diones by means of an oxidative cleavage of the 1,3-thiazolidine ring. The opening of the 1,3-thiazolidine ring was studied under different experimental conditions and a consistent mechanism is proposed. (C) 2008 Elsevier Ltd. All rights reserved.
Intermolecular disproportionation between dimethyl (2-furylmethylidene)malonate and 4-methoxybenzylamine
作者:Seda A. Torosyan、Yulia N. Biglova、Fanusa A. Gimalova、Mansur S. Miftakhov
DOI:10.1016/j.mencom.2016.09.022
日期:2016.9
Sodium hydride-promoted disproportionation of the title compounds affords tetramethyl 2-(2-furyl)propane-1,1,3,3-tetracarboxylate and furfural N-(4-methoxybenzyl)imine.