Cholesterol-lowering bile acid-binding agents: novel lipophilic polyamines
摘要:
A series of novel lipophilic polyamines was synthesized by the sodium cyanoborohydride-mediated reductive amination of various ketones and aldehydes with the polyamine tris(2-aminoethyl)amine. Two of these compounds, N,N-bis[2-(cyclododecylamino)ethyl]-N'-benzyl-1,2-ethanediamine trihydrochloride (36.3HCl) and N,N-bis[2-(cyclododecylmethylamino)ethyl]-N',N'-dimethyl-1,2-ethaediamine (23), are 29 and 24 times more potent than colestipol hydrochloride, respectively, for lowering animal serum cholesterol levels.
A Simple and Practical Synthetic Protocol for Acetalisation, Thioacetalisation and Transthioacetalisation of Carbonyl Compounds under Solvent-Free Conditions
作者:Abu T. Khan、Ejabul Mondal、Subrata Ghosh、Samimul Islam
Acid-catalyzed reaction of β,β′-disubstituted cross conjugated dienones or the corresponding ethylene acetals gives mainly 2,3-disubstituted 2-cyclopentenones in stead of the simple Nazarov cyclization products, 3,4-disubstituted 2-cyclopentenones. This transformation is explained in terms of electrocyclic ring-closure, addition of hydroxylic solvent(s), tautomerization of the resulting 2-hydroxycyclopentanone
ELECTROGENERATED ACID AS AN EFFICIENT CATALYST FOR ACETALIZATION OF CARBONYL GROUP WITH 1,2-BISTRIMETHYLSILOXYETHANE
作者:Sigeru Torii、Tsutomu Inokuchi
DOI:10.1246/cl.1983.1349
日期:1983.9.5
Electrolysis of a mixture of carbonyl compounds and bistrimethylsiloxyethane in CH2Cl2–LiClO4–(Pt) readily gave the corresponding acetalized products in good yields.
Highly Efficient Chemoselective Deprotection of <i>O,O</i>-Acetals and <i>O,O</i>-Ketals Catalyzed by Molecular Iodine in Acetone
作者:Jianwei Sun、Yanmei Dong、Liya Cao、Xinyan Wang、Shaozhong Wang、Yuefei Hu
DOI:10.1021/jo0486239
日期:2004.12.1
An extremely convenient method for deprotection of acetals and ketals catalyzed by molecular iodine (10 mol %) in acetone is reported. The protocol achieved the deprotection of acyclic or cyclic O,O-acetals and O,O-ketals in excellent yields within a few minutes under neutral conditions. The double bond, hydroxyl group, and acetate group remained unchanged, and the highly acid-sensitive furyl, tert-butyl
Components of the Sex Pheromone of Chilo Supressalis: Efficient Syntheses of (Z)-11-Hexadecenal and (Z)-13-Octadecenal
作者:S. Gil、M. A. Lázaro、R. Mestres、F. Millan、M. Parra
DOI:10.1080/00397919508011366
日期:1995.2
Abstract (Z)-11-Hexedecenal 1a and (Z)-13-octadecenenal 2a, components of the sex attractant pheromone of Chilo supressalis, have been synthesized as their ethylene acetals 1b and 2b from cyclododecanone 3, through intermediacy of the C12 ω functionalized acetals 8 and 12.