In Situ-Generated Iodonium Ylides as Safe Carbene Precursors for the Chemoselective Intramolecular Buchner Reaction
作者:Shanyan Mo、Xinhao Li、Jiaxi Xu
DOI:10.1021/jo501628h
日期:2014.10.3
A chemoselective intramolecular Buchner reaction employing iodoniumylides as safe carbene precursors has been developed. Iodoniumylides are generated in situ from N-benzyl-2-cyanoacetamides and PhI(OAc)2 in the presence of base and undergo intramolecular Buchner reaction under catalysis from Cu(OAc)2·H2O, affording fused cyclohepta-1,3,5-triene derivatives in up to 85% yield. The N,N-dibenzyl-2-cyanoacetamides
Factors Influencing the Regioselectivity of the Oxidation of Asymmetric Secondary Amines with Singlet Oxygen
作者:Dmitry B. Ushakov、Matthew B. Plutschack、Kerry Gilmore、Peter H. Seeberger
DOI:10.1002/chem.201500121
日期:2015.4.20
functionalization of amines. However, there are still several mechanistic uncertainties, particularly the factors governing the regioselectivity of the oxidation of asymmetric secondary amines and the oxidation rates of mixed primary amines. Herein, it is reported that singlet‐oxygen‐mediated oxidation of 1° and 2° amines is sensitive to the strength of the α‐CH bond and steric factors. Estimation of the
Highly Enantioselective Synthesis of Propargylamines Using (Mesitylmethyl)Benzylamine
作者:Paul Knochel、Nina Gommermann
DOI:10.1055/s-2005-918932
日期:——
(Mesitylmethyl)benzylamine proved to be a highly efficient amine component for the copper-catalyzed enantioselective three-component propargylamine synthesis. Exceptionally high enantioselectivities (up to 99% ee) were obtained.
Method and Kit for Detecting Lead in a Solid Sample
申请人:THE REGENTS OF THE UNIVERSITY OF MICHIGAN
公开号:US20170191976A1
公开(公告)日:2017-07-06
A method and kit for detecting the presence of lead in a solid sample is disclosed. The solid sample is brought into contact with a nonaqueous solution of a dithiocarbamate or quinoline capable of forming a gel upon contact with lead, with the formation of a gel showing that lead is present in the solid sample.