Nucleophilic Functionalization of Benzylidene Dihydrothiazole through DDQ-Promoted Formation of an Original Ambivalent Electrophilic Intermediate
作者:Cécile Vanier、Alain Wagner、Charles Mioskowski
DOI:10.1055/s-2001-14609
日期:——
Benzylidene dihydrothiazoles undergo DDQ-promoted hydrogen abstraction to yield an original ambivalent electrophilic intermediate. Treated with nucleophiles this covalent intermediate undergoes two possible substitution reactions one at the 5-methyl position and one at the DDHQ aromatic center. For a given benzylidene dihydrothiazole the ratio of the two products depends on the nature of the nucleophile.
苄叉二氢噻唑在DDQ促进下发生氢抽提反应,生成一种原始的双重亲电中间体。与亲核试剂反应时,这种共价中间体会经历两种可能的取代反应,一种发生在5-甲基位,另一种发生在DDHQ芳香中心。对于特定的苄叉二氢噻唑,这两种产物的比例取决于亲核试剂的性质。