Solvent-controlled direct radical oxyphosphorylation of styrenes mediated by Manganese(III)
作者:Guo-Yu Zhang、Cheng-Kun Li、Da-Peng Li、Run-Sheng Zeng、Adedamola Shoberu、Jian-Ping Zou
DOI:10.1016/j.tet.2016.04.013
日期:2016.6
Direct radical oxyphosphorylation of styrenes with diarylphosphine oxides and dialkylphosphites mediated by Mn(OAc)3 is described. The solvent played a key role in this selective difunctionalization reaction.
A phosphoryl radical-initiated Atherton-Todd-type reaction using air as the radical initiator and CHCl3 as the halogenating reagent for the phosphorylation of alcohols, phenols, and amines has been developed. This novel transformation provides a highly efficient route to important phosphinates, phosphinic amides, and phosphoramidates in up to 99% yield with a broad substrate scope under very mild conditions
A copper-catalyzed direct hydroxyphosphorylation of electron-deficient alkenes with H-phosphine oxides and dioxygen is reported. The present reaction, proceeds under mild reaction conditions with good functional group tolerance, affording the facile and efficient synthesis of various β-hydroxyphosphine oxides in a scaled-up manner with moderate to good yields.
Non-stabilized and semi-stabilized phosphonium diylids of the type (C6H5)2P(CHR)(CHLiR) (5) show a greater nucleophilic reactivity toward carbonyl compounds than the corresponding monoylids (C6H5)2P(CHR)(CH2R) (8). Thus diylid 5a reacts readily at room temperature with sterically hindered ketones such as fenchone or di-t-butylketone. However, the residual negative charge in the intermediate adduct
(C 6 H 5)2 P(CHR)(CHLiR)(5)类型的非稳定化和半稳定化的磷鎓二碘化物对羰基化合物的亲核反应性高于相应的单酰基(C 6 H 5)2 P( CHR)(CH 2 R)(8)。因此,二碘化物5a在室温下容易与空间受阻的酮例如fenchone或二叔丁基酮反应。然而,中间加合物13中残留的负电荷减慢了向维蒂希产物的分解,并且可能是造成E中观察到的变化(通常增强)的原因。在非稳定的和半稳定的脂质的情况下的-选择性。
Electrochemical Oxidative Phosphorylation of Aldehyde Hydrazones
The electrochemical phosphorylation of aldehyde hydrazones has been developed under exogenous oxidant-free conditions. The strategy provides expedient access to highly functionalized α-iminophosphine oxides with ample scope and broad functional group tolerance by means of mild, user-friendly electrolysis, in an undivided cell.