Synthesis of Nitrogen Heterocycles by Intramolecular Michael Type of Amination via Reduction of Imines with Di-n-butyliodotin Hydride (n-Bu2SnIH)
摘要:
Novel nitrogen heterocycles were prepared by a one-pot procedure involving the reductive amination of the bifunctional substrates containing an aldehyde and enone groups with di-n-butyliodotin hydride (n-Bu(2)SnlH).
Inner Workings of a Cinchona Alkaloid Catalyzed Oxa-Michael Cyclization: Evidence for a Concerted Hydrogen-Bond-Network Mechanism
作者:Lukas Hintermann、Jens Ackerstaff、Florian Boeck
DOI:10.1002/chem.201203505
日期:2013.2.11
specificity. A concerted hydrogen‐bond network mechanism is proposed, in which the alkaloid hydroxy group acts as a general acid in the protonation of the α‐carbanionic center of the product enolate. The importance of concerted hydrogen‐bond network mechanisms in organocatalytic reactions is discussed. The relative stereochemistry of protonation is proposed as analytical tool for detecting concerted addition
Synthesis of photochromic spiroindolinopyrans with extended conjugation
作者:Sharmila.K. Thakur、Bhaskar.D. Hosangadi
DOI:10.1016/0040-4020(96)00416-4
日期:1996.6
Unsaturated side chains have been introduced in benzopyran site of parent indolinospiropyran moiety using Wittig reaction under conditions of Phase Transfer Catalysis in a one pot synthesis. The resultant unsaturated photochromic indolinospirobenzopyrans show significant bathochromic shift in the uv region of absorption spectra.
Organic Colorant Complexes from Reactive Dyes and Articles Containing the Same
申请人:Milliken & Company
公开号:US20150299468A1
公开(公告)日:2015-10-22
An organic colorant complex with the following general structure:
AB
n
(DE)
m
T
x
Q
y
wherein A is an organic chromophore; B is an electrophilic reactive group covalently bonded to A directly or through a linking group; D is a nucleophilic linking group covalently bonding B and E, selected from the group consisting of NR, O, S, and 4-oxyanilino (—HN-Ph-O—); wherein R is selected from the group consisting of H, alkyl, aryl, and E; E is an organic alkyl and aryl group or an end group; T is an ionic group covalently linked to A; O is an organic cation, bonded to the organic chromophore A through ionic interaction with T; n, m, x, and y are independent integers from 1 to 10.
Phosphineborane complexes are transformed under mild conditions, in presence of an olefin, into quaternary phosphonium salts by reaction with an alkyl (or aryl) halide. In the case of the reaction of (R)-PAMP.BH31e with benzyl bromide, the enantiomerically pure phosphonium salt 3h is obtained.
Palladium-Catalyzed Regio- and Stereoselective Formate Reduction of Fluorine-Containing Allylic Mesylates. A New Entry for the Construction of a Tertiary Carbon Attached with a Fluoroalkyl Group
regioselective palladium-catalyzed formate reduction of γ-fluoroalkylated allylic esters is described. Reduction of the allylic esters under the influence of palladium with a monodentate phosphine ligand proceeded preferentially at the γ position, the corresponding reduction products with a fluoroalkyl group at the tertiary carbon being afforded in high yields. When the chiral allylic ester was employed