作者:P. Lhoste、M. Moreau、J. Dreux
DOI:10.1016/s0040-4020(01)91804-6
日期:1984.1
In the reaction between organomagnesium compounds and 2-pyrones, the relative stability of the 6-hydroxy 5,6-dihydro 2H-pyrans and their tautomeric forms (ketols) has no influence on the reaction pathway. When ethylenic ketols are obtained, the corresponding tautomeric dihydropyranols are prepared in a selective way by reaction of nucleophilic reagents on the 3,6-dihydro-2-pyrones. In the other hand
在有机镁化合物与2-吡喃酮之间的反应中,6-羟基5,6-二氢2H-吡喃及其互变异构形式(酮醇)的相对稳定性对反应途径没有影响。当获得烯属酮醇时,通过亲核试剂在3,6-二氢-2-吡喃酮上的反应选择性地制备相应的互变异构二氢吡喃醇。另一方面,在这两个反应过程中,二氢吡喃酚或不饱和酮醇E的排他性形成表明,在实验条件下,这两个实体之间没有平衡。