Multivariate optimization and mechanistic considerations of the amine induced ring-opening reaction of 2-alkyl-3-bromo-5-methylthiophene-1,1-dioxides
作者:Anders Tsirk、Salo Gronowitz、Anna-Britta Hörnfeldt
DOI:10.1016/s0040-4020(97)10390-8
日期:1998.2
In the optimization of the ring-opening reaction of thiophene-1,1-dioxides, 3-bromo-2,5-dimethylthiophene-1,1-dioxide (1) and 2-(2-hydroxyethyl)piperidine (7) were chosen as model reagents. Solvent, temperature, molar ratio between amine and dioxide and the amount of solvent were variables included in the optimization. A central composite design was chosen for the investigation and a canonical analysis
在优化噻吩-1,1-二氧化物的开环反应中,选择了3-溴-2,5-二甲基噻吩-1,1-二氧化物(1)和2-(2-羟乙基)哌啶(7)作为模型试剂。优化中包括变量,溶剂,温度,胺与二氧化物之间的摩尔比以及溶剂的量。选择中央复合材料设计进行调查,并对响应面进行规范分析。当3-溴-2-异丙基-5-三氟甲基噻吩-1,1-二氧化物(23)与7反应时,由于内部质子的提取以及分子内氘的转移,初级动力学同位素效应(由于内部返回而减弱)被发现。23的互变异构。