Organocatalytic Asymmetric Reaction Cascade to Substituted Cyclohexylamines
作者:Jian Zhou、Benjamin List
DOI:10.1021/ja072134j
日期:2007.6.1
We report a new strategy for organocatalytic cascade reactions. Accordingly, enamine catalysis, iminium catalysis, and Bronsted acid catalysis can work in concert in a highlyenantioselective organocatalytic cascadesequence toward chiral cis-3-substituted cyclohexylamines. We found that an achiral amine in combination with a catalytic amount of a chiral Bronsted acid can accomplish an aldol additi
The first example of an intramolecular Westphal reaction. Synthesis of a new aza-quinolizinium type system
作者:Valentín Martínez-Barrasa、Carolina Burgos、M.Luisa Izquierdo、Julio Alvarez-Builla、Juan J. Vaquero
DOI:10.1016/s0040-4039(99)00696-6
日期:1999.5
The first example of an intramolecular Westphal condensation is described. To test the utility of this reaction, new benz(f)azino[2,1-a]phthalazinium salts have been prepared from appropriate dicarbonyl precursors.
描述了分子内Westphal缩合的第一个例子。为了测试该反应的效用,已经从合适的二羰基前体制备了新的苯并(f)叠氮[2,1- a ]酞菁盐。
Design and Synthesis of Tridentate Facially Chelating Ligands of the [2.<i>n</i>.1]-(2,6)-Pyridinophane Family
作者:Andrei N. Vedernikov、Maren Pink、Kenneth G. Caulton
DOI:10.1021/jo034268v
日期:2003.6.1
Syntheses are reported for tripyridine macrocycles 2 and 3 and some of their alkyl derivatives. The macrocycles are designed to stabilize to various extents coordinated d(8) metal precursors and d(6) alkane oxidative addition products (Pt(IV)), therefore allowing favorable kinetics and thermodynamics of (e.g., Pt(II)) the cleavage of substrate H-C(sp(3)) bonds. Both the Chichibabin protocol and oxidative
Reductive cyclization of disubstituted pyridines and intramolecular aldolization of unsymmetrical diketones
作者:S. Danishefsky、A. Nagel、D. Peterson
DOI:10.1039/c39720000374
日期:——
The relative proportions of alternative cyclohexenones formed on the one hand from systems of the type 2-CH2R,6-methylpyridine by reductive cleavage, and on the other hand from systems of the type Ac[CH2]3CO·CH2R by alkaline cyclization may be different and may depend on the steric requirements of R.