carbon–heteroatom (C–P, C–O, C–S, and C–N) bonds via C–N cleavage of benzyl ammoniumsalts under transition-metal-free conditions was reported. The combination of t-BuOK and 18-crown-6 enabled a wide range of substituted benzyl ammoniumsalts to couple readily with different kinds of heteroatom nucleophiles, i.e. hydrogen phosphoryl compounds, alcohols, thiols, and amines. Good functional group tolerance was demonstrated
Copper-catalyzed C–P cross-coupling of arylmethyl quaternary ammonium salts via C–N bond cleavage
作者:Nutao Li、Feng Chen、Guanghui Wang、Qingle Zeng
DOI:10.1007/s00706-019-02535-y
日期:2020.1
AbstractA ligand-free copper-catalyzed C–P cross-coupling reaction of arylmethyl quaternary ammonium salts and diarylphosphine oxides in air is developed. Arylmethyl quaternary ammonium salts with various functional groups and a variety of dialkyl- and diarylphosphine oxides afford C–P cross-coupling products with good yields. This protocol requires no inert atmosphere, no ligand, and simple operation
Direct phosphorylation of benzylic C–H bonds under transition metal-free conditions forming sp<sup>3</sup>C–P bonds
作者:Qiang Li、Chang-Qiu Zhao、Tieqiao Chen、Li-Biao Han
DOI:10.1039/d2ra02812c
日期:——
Direct phosphorylation of benzylic C–H bonds with secondary phosphine oxides was first realized. The reaction was performed in organo/aqueous biphasic system and under transition metal-free conditions, proceeding via the cross dehydrogenative coupling.
route for carboxylicacidconversion as the alkyl source, enabling highly efficient and practical synthesis of the corresponding value-added organophosphorus compounds with high chemo-selectivity and wide substrate scope, including the late modification of complex APIs (active pharmaceutical ingredients). Moreover, this reaction also indicates a new strategy for converting carboxylicacids into alkenes
Reductive Coupling of P(O)–H Compounds and Aldehydes for the General Synthesis of Phosphines and Phosphine Oxides
作者:Jie Wang、Jing Xiao、Zi-Long Tang、Dong-Hui Lan、Li-Biao Han
DOI:10.1021/acs.joc.3c02678
日期:2024.4.5
strategy for the selective construction of a C(sp3)–P(III) or −P(V) bond from >P(O)–H compounds and aldehydes is disclosed. By using the H3PO3/I2 system, various secondary phosphine oxides could react with both aromatic and aliphatic aldehydes to afford valuable phosphines (isolated as sulfides) and phosphine oxides in good yields. This method features a wide substrate scope and simple reaction conditions