Novel Nine-Membered Titanaheterocycles – Structure, ab initio Calculations, and Preparative Use towards the Selective Synthesis of Substituted Cyclopentanols
A novel synthetic route to phenyl-substituted pyridines synthesis of [1] benzopyrano[4,3-b]pyridines, [1]benzothiopyrano[4,3-b]bpyridines and pyrido[3,2-b][1,4]benzothiazines(1-azaphenothiazines)
作者:D.V. Tyndall、T. Al Nakib、M.J. Meegan
DOI:10.1016/0040-4039(88)85265-1
日期:——
4-diphenyl-2-methoxypyridine-3-carbonitrile. This reaction has been applied to a general synthesis of phenyl-substituted [1]benzopyrano[4,3-pyridines, [1]benzothiopyrano[4,3-]pyridines and pyrido[3,2- [1,4]benzothiazines(1-azaphenothiazines).
Restoration of catalytic activity by the preservation of ligand structure: Cu-catalysed asymmetric conjugate addition with 1,1-diborylmethane
作者:Changhee Kim、Byeongdo Roh、Hong Geun Lee
DOI:10.1039/d0sc06543a
日期:——
conditions that control the amount of nucleophilic alkoxide base, which is the origin of ligand decomposition. Overall, the strategy has been successfully applied to a new class of asymmetric conjugate addition reactions with bis[(pinacolato)boryl]methane, in which α,β-unsaturated enones are utilised as substrates.
Tandem Michael addition/ylide olefination reaction for the synthesis of highly functionalized cyclohexadiene derivatives
作者:Long-Wu Ye、Xun Han、Xiu-Li Sun、Yong Tang
DOI:10.1016/j.tet.2008.06.048
日期:2008.8
A tandemMichael addition/ylide olefination for the rapid creation of highlyfunctionalized cyclohexadiene is developed. The tandem annulation reactions afford versatile cyclohexadienes in good to excellent isolated yields. This method has been successfully applied to the synthesis of three biologically active molecules.
Aldol condensations of aldehydes and ketones catalyzed by rare earth(III) perfluorooctane sulfonates in fluorous solvents
作者:Wen-Bin Yi、Chun Cai
DOI:10.1016/j.jfluchem.2005.09.004
日期:2005.12
Rare earth(III) perfluorooctane sulfonates (RE(OPf)3) catalyze the efficient aldol condensation of different ketones with various aromatic aldehydes in fluorous solvents without the occurrence of any self-condensations. By simple separation of the fluorous phase containing only catalyst, reaction can be repeated several times.
A New Lewis Acid System Palladium/TMSCl for Catalytic Aldol Condensation of Aldehydes with Ketones
作者:Yulin Zhu、Yuanjiang Pan
DOI:10.1246/cl.2004.668
日期:2004.6
catalyzed the aldolcondensation reactions of different ketones with aldehydes in the presence of trimethylsilyl chloride (TMSCI). The following reactions were investigated: (1) aromaticaldehydes with cycloalkanones, (2) aromaticaldehydes with aromatic ketones, (3) cycloalkanones with aliphatic aldehydes, and (4) the self-condensation reactions of aliphatic aldehydes and cycloalkanones.