The first example of a regioselective β-arylation of benzo[b]thiophenes and thiophenes at room temperature with aryl iodides as coupling partners is reported. This methodology stands out for its operational simplicity: no prefunctionalization of either starting material is required, the reaction is insensitive to air and moisture, and it proceeds at room temperature. The mild conditions afford wide
报道了苯并[b]噻吩和噻吩在室温下以芳基碘作为偶联伙伴的区域选择性β-芳基化的第一个例子。这种方法因其操作简单而突出:不需要任何一种起始材料的预官能化,反应对空气和水分不敏感,并且在室温下进行。温和的条件提供了广泛的官能团耐受性,通常具有完全的区域选择性和高产率,从而形成高效的催化系统。包括 13C 和 2H KIE 在内的初步机理研究表明,该过程是通过噻吩双键上的协同碳钯化作用发生的,然后是碱基辅助的抗消除作用。
INVESTIGATION OF BIOISOSTERS OF THE GROWTH HORMONE SECRETAGOGUE L-692,429.
The synthesis and structure-activity relationships of several analogs of L-692,429 with modifications in the biaryl and tetrazole moieties are described and several derivatives were found to be equipotent or slightly more potent than L-692,429. (C) 1997 Elsevier Science Ltd.
Spiro-tricyclicaromatic succinimide derivatives as inhibitors of aldose reductase