Substituted tetrahydrofuran derivatives play important roles as biological activities. A versatile method for the synthesis of beta-phosphonotetrahydrofurans has been developed based on Cu-catalyzed difunctionalization of alkenes. This transformation would provide a new pathway for the formation of Csp(3)-P and Csp(3)-O bonds in one step. Furthermore, this copper catalyst system can be used in the synthesis of beta-phosphonotetrahydropyrans and phosphono-gamma-butyrolactones. These reactions were also performed well by using 3 equiv of Mn(OAc)(3)center dot 2H(2)O as the oxidant without copper catalyst.
Mn(OAc)<sub>3</sub>-mediated phosphonation–lactonization of alkenoic acids: synthesis of phosphono-γ-butyrolactones
A new, general method for the synthesis of phosphono-γ-butyrolactones has been achieved through Mn(OAc)3-mediated radical oxidative phosphonation and lactonization of alkenoic acids withH-phosphonates andH-phosphine oxide.