A novel one-pot three-component tandem Michael/aldol/Horner–Wadsworth–Emmons (HWE) reaction of lithium alkylselenolates with 1-alkynylphosphine oxides and aldehydes: facile synthesis of selenium-substituted allenes
作者:Xian Huang、Zheng-Chang Xiong
DOI:10.1039/b304527g
日期:——
The one-pottandem Michael/aldol/Horner–Wadsworth–Emmons (HWE) reaction of lithium alkylselenolates, 1-alkynylphosphine oxides and aldehydes in THF provides a new general access to selenium-substituted allenes with good to excellent yields.
Facile synthesis of sulfur-substituted allenes by a three-component reaction
作者:Xian Huang、Zheng-Chang Xiong
DOI:10.1016/s0040-4039(03)01410-2
日期:2003.7
The three-component reaction of lithium alkylthiolate, 1-alkynylphosphine oxide and aldehyde in THF affords sulfur-substituted allenes in good to excellent yield. (C) 2003 Published by Elsevier Ltd.
Zirconium-Catalyzed Reactions of 1-Alkynyl Phosphine Oxides and Sulfides with Et3Al
The interaction of 1-alkynyl phosphineoxides, sulfides, and selenides with Me 3 Al and Et 3 Al under zirconocene catalysis was studied. It has been found that the pathway of the reaction of 1-alkynyl phosphine derivatives with Et 3 Al strongly depends on the nature of the substrate and the solvent. The ethylalumination takes place in the case of 1-alkynyl phosphineoxides in hexane solvent. The reaction
研究了二茂锆催化下1-炔基氧化膦、硫化物和硒化物与Me 3 Al和Et 3 Al的相互作用。已经发现,1-炔基膦衍生物与Et 3 Al的反应途径很大程度上取决于底物和溶剂的性质。在己烷溶剂中的 1-炔基氧化膦的情况下发生乙基铝化。当使用二氯甲烷作为溶剂时,1-己炔基氧化膦与Et 3 Al的反应失败。锆催化的 1-庚炔基膦硫化物与 Et 3 Al 的反应是在低价锆配合物的作用下进行环铝化和脱硫。1-庚炔基硒化膦在反应条件下完全脱硒。
Expedient radical phosphonylations <i>via</i> ligand to metal charge transfer on bismuth
作者:Jatin Patra、Akshay M. Nair、Chandra M. R. Volla
DOI:10.1039/d4sc00692e
日期:——
bismuth LMCT catalysis for the generation of heteroatom centered radicals, we hereby report an efficient radical phosphonylation using BiCl3 as the LMCT catalyst. Phosphonyl radicals generated viavisible-lightinduced LMCT of BiCl3 were subjected to a variety of transformations like alkylation, amination, alkynylation and cascade cyclizations. The catalytic system tolerated a wide range of substrate classes