β-Ketophosphonates formation via deesterification or deamidation of cinnamyl/alkynyl carboxylates or amides with H-phosphonates
作者:Yao Zhou、Mingxin Zhou、Ming Chen、Jihu Su、Jiangfeng Du、Qiuling Song
DOI:10.1039/c5ra23950h
日期:——
We report here an unprecedented Fe/Cu synergistically catalyzed deesterificative or deamidative oxyphosphorylation of unsaturated carboxylates or amides with H-phosphonates.
A simple and convenient copper‐catalyzed directoxyphosphorylation of enamides with P(O)‐H compounds and dioxygen has been developed under mild conditions. This methodology can allow the synthesis of a series of valuable β‐ketophosphine oxides/β‐ketophosphonates in moderate to good yields with a broad substrate scope simply by using readily‐available starting materials.
Mn(OAc)<sub>3</sub>-Promoted Oxidative C<sub>sp<sup>3</sup></sub>–P Bond Formation through C<sub>sp<sup>2</sup></sub>–C<sub>sp<sup>2</sup></sub> and P–H Bond Cleavage: Access to β-Ketophosphonates
The Mn(OAc)3-promoted oxidative phosphonylation of N,N-dimethylenaminones with H-phosphonates, involving a chemo- and regioselective Csp2–Csp2 bond cleavage and Csp3–P bond formation in one step, provided successfully functionalized β-ketophosphonates under mild reaction conditions. Oxidative Csp3–H/P–H cross-coupling reactions via Csp3–C(C═O) bond cleavage and mechanistic studies are conducted preliminarily
An efficient one-pot synthesis of β-ketophosphonates has been developed, via the reaction of α,β-alkenyl carboxylic acids or alkenes with H-phosphonates and air oxygen, catalyzed by CuSO4·5H2O in CH3CN. CH3CN plays a decisive role, probably by forming an active oxygen complex [(MeCN)nCuII-O-O·].
通过在CH 3 CN中由CuSO 4 ·5H 2 O催化α,β-烯基羧酸或烯烃与H-膦酸酯和空气氧的反应,已经开发出有效的一锅法合成β-酮膦酸酯。CH 3 CN可能起决定性作用,可能是通过形成活性氧络合物[(MeCN)n Cu II -OO·]。