An effective synthetic route to ortho-difluoromethyl arylphosphosphonates: studies on the reactivity of phosphorus- and fluorine-containing functions
作者:Sergey N. Tverdomed、Jacek Kolanowski、Enno Lork、Gerd-Volker Röschenthaler
DOI:10.1016/j.tet.2011.03.076
日期:2011.5
Herein, we report a new and convenient methodology for the synthesis of ortho-XCF2 arylphosphonates via Diels–Alder reaction of selected 1,3-butadienes with XCF2–≡–P(O)(OEt)2, followed by the aromatization of the cyclic vinylphosphonates obtained using the KMnO4/Al2O3 system. The reactivity of ortho-XCF2 arylphosphonates was then examined to give the respective dichlorides that were converted to the
本文中,我们报告了一种新的便捷方法,用于通过所选1,3-丁二烯与XCF 2 – 2 –P(O)(OEt)2的Diels–Alder反应合成邻-XCF 2芳基膦酸酯,然后进行芳构化。使用KMnO 4 / Al 2 O 3系统获得的环状乙烯基膦酸酯。然后检查邻-XCF 2芳基膦酸酯的反应性,得到各自的二氯化物,将其转化为相应的膦酸,氧化膦或羧酸(在CF 2 Br基团水解时)。当邻位-XCF 2用Zn / CuBr和亲电子试剂处理芳基膦酸酯(X = Br),仅分离出二聚体产物ArCF CFAr。然而,CF 2 H基团的锂化(X = H)允许获得被各种亲电试剂亲核取代的产物。