Silver-Catalyzed Regioselective Phosphorylation of <i>para</i>-Quinone Methides with P(III)-Nucleophiles
作者:Shipan Xu、Jun Xie、Yu Liu、Weifeng Xu、Ke-Wen Tang、Biquan Xiong、Wai-Yeung Wong
DOI:10.1021/acs.joc.1c01703
日期:2021.11.5
Moreover, a series of corresponding enantiomers can be obtained by employing dialkyl arylphosphonite (ArP(OR)2) as substrates. The control experiments and 31P NMR tracking experiments were also performed to gain insights for the plausible reaction mechanism. This protocol may have significant implications for the formation of C(sp3)–P bonds in Michaelis–Arbuzov-type reactions.
P(III)-亲核试剂 (P(OR) 3 , ArP(OR) 2 , Ar 2 P-OR)银催化对醌甲基化物 ( p -QMs )区域选择性磷酸化的简单有效方法通过 Michaelis-Arbuzov 型反应建立。在温和条件下,广泛的 P(III)-亲核试剂和对-醌甲基化物具有良好的耐受性,从而得到预期的二芳基甲基取代的有机磷化合物,具有良好的产率。此外,以二烷基芳基亚膦酸酯(ArP(OR) 2 )为底物,可以得到一系列相应的对映异构体。对照实验和31还进行了 P NMR 跟踪实验以深入了解可能的反应机制。该协议可能对Michaelis-Arbuzov 型反应中 C( sp 3 )-P 键的形成具有重要意义。
Metal-Free, Acid/Phosphine-Induced Regioselective Thiolation of <i>p</i>-Quinone Methides with Sodium Aryl/Alkyl Sulfinates
作者:Biquan Xiong、Shipan Xu、Yu Liu、Ke-Wen Tang、Wai-Yeung Wong
DOI:10.1021/acs.joc.0c02390
日期:2021.1.15
with sodiumaryl/alkyl sulfinates has been established using an acid/phosphine-induced radical route under transition-metal-free conditions. A broad range of sodiumaryl/alkyl sulfinates and p-quinone methides (p-QMs) are compatible for the reaction, giving the expected products with good to excellent yields. Control experiments were also performed to gain insights into the generation mechanism of thiyl
Metal-free, radical 1,6-conjugated addition of cyclic ethers with <i>para</i>-quinone methides (<i>p</i>-QMs)
作者:Satish G. More、Gurunath Suryavanshi
DOI:10.1039/c9ob00127a
日期:——
An efficient method for metal-free C–C bond formation between p-quinone methides (p-QMs) and cyclic ethers via a radical pathway to afford substituted diarylmethanes and triarylmethanes or to effect the α-alkylation of the cyclic ethers has been developed. Also, the synthesis of 3,3′-disubstituted oxindoles with stereogenic quaternary carbon centers was successfully achieved under mild reaction conditions
Iron catalyzed tandem ring opening/1,6-conjugate addition of cyclopropanols with <i>p</i>-quinone methides: new access to γ,γ-diaryl ketones
作者:Sachin R. Shirsath、Sagar M. Chandgude、M. Muthukrishnan
DOI:10.1039/d1cc05997a
日期:——
An iron(III) catalyzed tandem ring opening/1,6-conjugate addition of cyclopropanols to p-quinone methides leading to γ,γ-diaryl ketones has been described. This catalytic protocol provides a novel and efficient method to access γ,γ-diaryl ketone derivatives in good to excellent yields with high functional group tolerance. Importantly, γ,γ-diaryl ketone can be further functionalized to give a versatile
Base-Catalyzed 1,6-Hydrophosphonylation of <i>p</i>
-Quinone Methides with Diphenylphosphane Oxide/Phosphites
作者:Bin Zhang、Lu Liu、Shukuan Mao、Ming-Dong Zhou、He Wang、Lei Li
DOI:10.1002/ejoc.201900606
日期:2019.6.30
We report a novel base‐catalyzed 1,6‐conjugated addition of p‐QMs with diphenylphosphane oxide/phosphites to construct diarylmethyl phosphonate compounds. This reaction features the readily available substrates, high reaction efficiency, a broad substrate scope (46 examples), and good functional group tolerance under mild metal‐free conditions.