作者:Rodolfo Lavilla、Alessandro Spada、Joan Bosch
DOI:10.1021/ol0057380
日期:2000.6.1
An oxidative double phosphonylation of dihydropyridines 1 and pyridinium salts 2 is achieved through the use of dialkyl phosphites, DDQ, and triethylamine. Acceptable to good yields of 2, 6-diphosphonylated-1,2-dihydropyridines 3 are obtained in a one-pot reaction involving tandem nucleophilic addition/oxidation processes. Isomerization of 3 to the more stable 2,4-diphosphonylated-1, 4-dihydropyridine
通过使用亚磷酸二烷基酯,DDQ和三乙胺实现二氢吡啶1和吡啶鎓盐2的氧化双膦酰化。在涉及串联亲核加成/氧化过程的一锅反应中获得可接受的2,6-二膦酰化-1,2-二氢吡啶3的良好收率。在某些情况下,观察到3异构化为更稳定的2,4-二膦酰化-1,4-二氢吡啶4。