Metal-free, Regio-, and Stereo-Controlled Hydrochlorination and Hydrobromination of Ynones and Ynamides
作者:Xiaojun Zeng、Zhichao Lu、Shiwen Liu、Gerald B. Hammond、Bo Xu
DOI:10.1021/acs.joc.7b02257
日期:2017.12.15
We developed an atom-economical and metal-free method for the regio- and stereo-selective hydrohalogenation of ynones and ynamides using easy to handle DMPU/HX (X = Br or Cl) reagents. The reaction operates under mild conditions and a range of functional groups is well tolerated. We propose that the hydrohalogenation of ynones gives the anti-addition products via a concerted multimolecular AdE3 mechanism
The regioselectivity of the conversion of 1,3-diketones into beta-chloroenones can be changed by the appropriate choice of the reagent: reaction with ''Vilsmeier's reagent'' prepared from POCl3 and dimethylformamide or treatment of the diketone with the oxalyl chloride in the presence of dimethylformamide.
MANOIU D.; MANOIU M.; DINULESCU I. G.; AVRAM M., REV. ROUM. CHIM., 29,(1986) N 2, 201-206
作者:MANOIU D.、 MANOIU M.、 DINULESCU I. G.、 AVRAM M.
DOI:——
日期:——
MANOIU D.; MANOIU M.; DINULESCU I. G.; AVRAM M., REV. ROUM. CHIM., 29,(1984) N 2, 193-199
作者:MANOIU D.、 MANOIU M.、 DINULESCU I. G.、 AVRAM M.
DOI:——
日期:——
[EN] CATALYTIC ASYMMETRIC SYNTHESIS OF OPTICALLY ACTIVE COMPOUNDS<br/>[FR] SYNTHESE ASYMETRIQUE CATALYTIQUE DE COMPOSES OPTIQUEMENT ACTIFS
申请人:CHEMINOVA AS
公开号:WO2003050105A2
公开(公告)日:2003-06-19
A one step catalytic asymmetric process for the synthesis of an optically active compound of formula la or lb wherein R is selected from C1-7 alkyl, C1-7 haloalkyl, C1-7 alkoxy, C1-7 haloalkoxy, halogen and hydroxy; R3 is H or C1-4 alkyl; R4 is selected from H, C1-7 alkyl, C1-7 haloalkyl, C1-7 alkoxy, COOH, CO-C1-7 alkoxy and an optionally substituted aryl or heterocycle; AR represents C1-7 alkyl, optionally substituted aryl, an optionally substituted heterocycle or AR and R4 may be bridged together forming part of a ring system; X is O or S; m is a number between 0-4; comprising the step of reacting a compound of the formula 2 with a compound of formula 3 in the presence of a catalytic amount of a chiral nitrogen containing organic compound.