N,N,P-Pincer 镍配合物可有效催化醇与氧化苄基膦的反应,以良好的收率形成烯烃。该方案适用于多种底物,并且仅生成E构型烯烃。该方法还表现出良好的官能团相容性。甲氧基、甲硫基、三氟甲基、缩酮、氟、氯、溴、噻吩基和呋喃基均可接受。机理研究表明,该反应是通过醇催化脱氢生成醛或酮,然后在 KO t Bu 存在下与氧化苄基二苯基膦缩合进行的。
Efficient synthesis of benzylphosphine oxides and E-stilbenes
摘要:
A series of substituted benzylphosphine oxides has been synthesised by reduction of the corresponding (alpha-chlorobenzyl)phosphine oxide, derived from the benzaldehyde and chlorodiphenylphosphine, with either sodium borohydride (DMSO, 60-70 degrees C, 12 h) or tributyltin hydride and AIBN (C6H6. 80 degrees C, 2 h). Reaction of the (alpha-lithiobenzyl)phosphine oxide with aldehydes gave exclusively E-alkenes.
Palladium-catalyzed C(sp3)–P(III) bond formation reaction with acylphosphines as phosphorus source
作者:Mengyue Zhang、Zhichao Ma、Hongguang Du、Zhiqian Wang
DOI:10.1016/j.tetlet.2020.152125
日期:2020.7
Palladium-catalyzed C(sp3)–P(III) bond formation reaction for alkyl substituted phosphines preparation was developed. In this reaction, various alkyl bromides and limited alkylchlorides reacted with acylphosphine under relative mild and easily accessible condition, and differential phosphines were afforded in good yields. This reaction made up the application of palladium catalysis in C(sp3)–P(III) bond formation
The controllable phosphorylations of thioesters were developed. When the reaction was catalyzed by a palladium catalyst, aryl or alkenyl phosphoryl compounds were generated through decarbonylative coupling, while the benzyl phosphoryl compounds were produced through deoxygenative coupling when the reaction was carried out in the presence of only a base.
Ni-Catalyzed C–P Coupling of Aryl, Benzyl, or Allyl Ammonium Salts with P(O)H Compounds
作者:Bo Yang、Zhong-Xia Wang
DOI:10.1021/acs.joc.8b02926
日期:2019.2.1
C–P bonds via the nickel-catalyzed cross-coupling of organoammonium salts with appropriate phosphorus nucleophiles has been developed. Aryl-, pyridyl-, benzyl-, and allyl-ammonium triflates can be employed as the electrophiles. The employed phosphorus-based nucleophiles included diaryl/dibutyl phosphine oxide, dialkylphosphonates, and ethyl phenylphosphinate. Functional groups OMe, CN, CF3, F, Cl
A palladium-catalyzed phosphorylation of benzyl ammonium triflates with P(O)H compounds has been developed. Various benzylphosphorus compounds were produced in good to excellent yields with high functional group tolerance. All the three kinds of hydrogen phosphoryl compounds, i.e. H-phosphonates, H-phosphinates and secondary phosphine oxides, were applicable to this reaction. The successful scale-up