selective dehydrohalogenation to form alpha-haloacrylate analogues. A variety of alpha-halo Michael acceptors were prepared in dimethyl sulfoxide under mild, base-free conditions, including the preparation of alpha-bromoacrolein and alpha-chloro- and bromoacrylonitriles. Synthesis of these molecules has been reported in the literature to be difficult. Among all the existing dehydrohalogenation procedures
1-(N-Acyl-carbamoyl)-2-cyanoaziridines of the formula ##STR1## wherein X is oxygen or sulphur, Z is hydrogen or an organic radical, and Y is a carbonyl, sulphonyl, sulphinyl, sulphenyl, phosphoryl or phosphonyl radical, and salts thereof, exhibit immune-stimulating and cancerostatic activities.
[EN] A PROCESS FOR PREPARATION OF TRIAMINOPYRIMIDINE COMPOUND AND INTERMEDIATES THEREOF<br/>[FR] PROCÉDÉ DE PRÉPARATION DE COMPOSÉ DE TRIAMINOPYRIMIDINE ET DE SES INTERMÉDIAIRES
申请人:CADILA HEALTHCARE LTD
公开号:WO2019049021A1
公开(公告)日:2019-03-14
The present invention relates to triaminopyrimidine compound 1, or pharmaceutically acceptable salts thereof, or hydrates, or solvates, or polymorphs, or optically active forms thereof, in solid state forms. The invention also relates to a process for preparation of triaminopyrimidine compound and intermediates thereof. The present invention also relates to a pharmaceutical composition comprising pure triaminopyrimidine compound, useful for preventing or treating malaria.
Elimination reaction over solid supports under microwave irradiation: Synthesis of functionalized alkenes
作者:Aicha Saoudi、Jack Hamelin、Hadj Benhaoua
DOI:10.1016/s0040-4039(98)00690-x
日期:1998.6
Treatment of 1,2-dibromocompounds with KF supported on alumina, or bentonite/Et3N undermicrowaveirradiation leads to an elimination reaction which produces functionalized alkenes in fair yields.
在微波辐射下,用负载在氧化铝上的KF或膨润土/ Et 3 N处理1,2-二溴化合物会导致消除反应,从而以合理的收率生产官能化的烯烃。
Development of Scalable Processes for the Preparation of <i>N</i>-Methyl-3-Bromo-5-Methyl Pyrazole
作者:Richard J. Fox、Chester E. Markwalter、Michael Lawler、Keming Zhu、Jacob Albrecht、Joseph Payack、Martin D. Eastgate
DOI:10.1021/acs.oprd.7b00091
日期:2017.5.19
The development and optimization of two scalable routes to N-methyl-3-bromo-5-methyl pyrazole is described. The initial Sandmeyer route entailed a three-step sequence from crotonitrile and methyl hydrazine, proceeding through the 3-amino pyrazole intermediate. Due to the GTI liability of the 3-amino pyrazole intermediate, a tedious steam-distillation, and <30% overall yield, we developed a second-generation