Rh<sup>III</sup>-Catalyzed Regioselective Preparation of 3-Hetero-Substituted Isocoumarins from Aryl Carboxylic Acids and Alkynes
作者:Lijuan Song、Jing Xiao、Wanrong Dong、Zhihong Peng、Delie An
DOI:10.1002/ejoc.201601330
日期:2017.1.10
An oxygen-mediated annulation reaction has been reported herein. Various 3-hetero-substituted isocoumarins were successfully prepared with high efficiency (yields up to 88 %) and good functional-group tolerance (35 examples) in the presence of a rhodium catalyst. A plausible mechanism has also been proposed that shows the high regioselectivity mostly likely originates from the electron-density difference
Cs<sub>2</sub>CO<sub>3</sub>-Promoted One-Pot Synthesis of Alkynylphosphonates, -phosphinates, and -phosphine Oxides
作者:Yulei Wang、Jiepeng Gan、Liu Leo Liu、Hang Yuan、Yuxing Gao、Yan Liu、Yufen Zhao
DOI:10.1021/jo500312n
日期:2014.4.18
trialkyl phosphites, ethyl diphenylphosphinite, or diethyl phenylphosphonite has been developed under metal-free conditions, providing a practical and powerful tool for one-pot synthesis of valuable alkynylphosphonates, -phosphinates, and -phosphine oxides in good to excellent yields.
在无金属条件下开发了一种新颖且有效的Cs 2 CO 3促进的各种1,1,1-二溴-1-烯烃与容易获得的亚磷酸三烷基酯,乙基二苯基亚膦酸酯或二乙基苯基亚膦酸酯的磷酸化或亚膦酰基化,提供了实用而有效的方法一锅合成有价值的炔基膦酸酯,-次膦酸酯和-膦氧化物的工具,产率很高。
Copper-catalyzed decarboxylative C−P cross coupling of arylpropiolic acids with dialkyl hydrazinylphosphonates leading to alkynylphosphonates
ABSTRACT A facile and novel copper-catalyzed decarboxylative coupling of various arylpropiolic acids with readily available dialkyl hydrazinylphosphonates has been developed, providing an attractive synthetic tool for the synthesis of valuable alkynylphosphonates with operational simplicity and mild reaction conditions. GRAPHICAL ABSTRACT
Aerobic oxidative alkynylation of H-phosphonates and amides: an efficient route for the synthesis of alkynylphosphonates and ynamides using a recyclable Cu–MnO catalyst
作者:Harshvardhan Singh、Tapan Sahoo、Chiranjit Sen、Sunil M. Galani、Subhash Chandra Ghosh
DOI:10.1039/c9cy00275h
日期:——
and efficient route for the synthesis of alkynylphosphonates and ynamides by aerobic oxidative alkynylation of H-phosphonates and amides with both aliphatic and aromatic alkynes using our synthesized recyclable heterogeneous Cu–MnO catalyst has been developed. The phosphorylation was carried out under base- and ligand-free conditions, and in the presence of air as the sole oxidant. The reaction is compatible
Ruthenium-Catalyzed Homo Diels–Alder [2 + 2 + 2] Cycloadditions of Alkynyl Phosphonates with Bicyclo[2.2.1]hepta-2,5-diene
作者:Tanner J. Kettles、Neil Cockburn、William Tam
DOI:10.1021/jo2010928
日期:2011.8.19
Ruthenium-catalyzed homo Diels–Alder [2 + 2 + 2] cycloadditions between alkynyl phosphonates and bicyclo[2.2.1]hepta-2,5-diene were studied. The observed reactivity was found to be dependent on the presence of the phosphonate moiety. The Ru-catalyzed cycloaddition was compatible with a variety of aromatic and aliphatic substituted alkynyl phosphonates, providing the corresponding phosphonate substituted