Tautomeric selectivity towards colchicinoids in the tosylation of colchiceine on a heterogeneous, easily removable catalyst
作者:Marino Cavazza、Francesco Pietra
DOI:10.1039/b307650b
日期:——
Here is presented an easy, rapid new method of tosylation of compounds containing acidic OH groups, such as tropolones and phenols, on a solid, removable catalyst, Amberlite IRA-400(OH); of special value is the preferential selectivity for the colchiceine tautomer 1a, leading to 10-tosyloxycolchicide (2)—the precursor of a variety of bioactive colchicinoids—which inverts the result of previous tosylation methodologies leading preferentially to useless 9-tosyloxyisocolchicide (3).
这里介绍了一种新的简单快速的磺化方法,用于含有酸性羟基的化合物(如曲泊酮和酚类)在可回收的固体催化剂 Amberlite IRA-400(OH)上的磺化反应。这种方法特别重要的是对秋水仙碱酮式互变异构体1a具有优先选择性,可生成10-对甲苯磺酰氧基秋水仙碱(2) - 这是多种具有生物活性的秋水仙碱类化合物的前体。这一结果与之前的磺化方法形成对比,因为之前的方法主要生成无用的9-对甲苯磺酰氧基异秋水仙碱(3)。