Diastereoselective Synthesis of trans-N-Benzyl-2-(2-methylphenyl)-6-phenyl-4-piperidone
摘要:
Diastereoselective synthesis of trans-N-benzyl-2-(2-methylphenyl)-6-phenyl-4-piperidone (6a) was performed by cycloaddition of the aldimine (1c) with 2-silyloxy-1,3-butadiene in the presence of trimethylsilyl triflate. The use of the p-trimethylsilyl substituent of the aromatic ring of the aldimine gave high diastereoselectivity of the product.
Copper-Catalyzed Borylative Cross-Coupling of Allenes and Imines: Selective Three-Component Assembly of Branched Homoallyl Amines
作者:James Rae、Kay Yeung、Joseph J. W. McDouall、David J. Procter
DOI:10.1002/anie.201508959
日期:2016.1.18
A copper‐catalyzed three‐component coupling of allenes, bis(pinacolato)diboron, and imines allows regio‐, chemo‐, and diastereoselective assembly of branched α,β‐substituted‐γ‐boryl homoallylic amines, that is, products bearing versatile amino, alkenyl, and borane functionality. Alternatively, convenient oxidative workup allows access to α‐substituted‐β‐amino ketones. A computational study has been
high reduction potential of carbonyl compounds and imines. In the context of photoredox catalysis, tertiary amines are commonly employed as sacrificial co‐reducing agents. Herein, an additional role of the amine is proposed, in which it is essential for the organocatalytic substrate activation. The combination of photoredox catalysis and carbonyl/imine activation enables the reductivecoupling of aldehydes
A new synthesis of pyrrolidines via imino-aldol reaction of (2-trimethylsilylmethyl)cyclopropyl ketones with imines
作者:Veejendra K. Yadav、Archana Gupta
DOI:10.1016/j.tetlet.2008.03.117
日期:2008.5
A newsynthesis of 2,3,5-trisubstituted pyrrolidines from the imino-aldols formed from Lewis acid-mediated reactions of (2-trimethylsilylmethyl)cyclopropylketones with benzylimines is described. The ring closure of the imino-aldols formed from the benzylimines of 2-chloro-, 2-fluoro-, and 2-trifluoromethylbenzaldehydes proceeds with predominantly 2,5-anti selectivity to generate the corresponding
Thiourea-Catalyzed Enantioselective Hydrophosphonylation of Imines: Practical Access to Enantiomerically Enriched α-Amino Phosphonic Acids
作者:Guy D. Joly、Eric N. Jacobsen
DOI:10.1021/ja0494398
日期:2004.4.1
Chiral thiourea 1b catalyzes the highly enantioselective hydrophosphonylation of a wide range of N-benzyl imines. The hydrophosphonylation products are readily deprotected by hydrogenolysis, providing access to free alpha-amino phosphonic acids in highly enantioenriched form.
A Novel Approach for Mannich-Type Bases Having a Terminal Olefin: Zinc Triflate and Water-Promoted Cyclization/C−N Bond Cleavage Process