Reaction of benzolactams with triethyl phosphite prompted by phosphoryl chloride affords benzoannulated monophosphonates instead of expected bisphoshonates
gave cyclic aminomethylene-gem-bisphosphonates in reaction with triethyl phosphite and phosphoryl chloride, the corresponding benzoannulated lactams usually provide monophosphonates of variable structures, which depend on size of the substrate aliphatic ring. Most likely they are obtained by dephosphonylation of bisphosphonates, which form as initial products of this reaction. These phosphonate esters
Regioselective Oxidative C-H Phosphonation of Imidazo[1,2-<i>a</i>]pyridines and Related Heteroarenes Mediated by Manganese(III) Acetate
作者:Mahipal Yadav、Saidulu Dara、Varma Saikam、Mukesh Kumar、Sravan Kumar Aithagani、Satya Paul、Ram A. Vishwakarma、Parvinder Pal Singh
DOI:10.1002/ejoc.201500984
日期:2015.9
Herein, we report a MnIII-mediated regioselective method for the direct C–Hphosphonation of imidazo[1,2-a]pyridines by using dialkyl phosphites. 3-Phosphonated imidazo[1,2-a]pyridines are synthesized in good to excellent yields under the optimized reaction conditions. The present method is also applicable to the functionalization of relatedheteroarenes, and unlike previously reported methods, the
We presented a palladium-catalyzed dominocyclization/phosphorylation of gem-dibromoolefins, which utilize H-phosphinates and secondary phosphineoxides as the phosphine sources, respectively. A variety of phosphorylated heteroaromatics were obtained in moderate to good yields with wide functional group compatibility. This one-pot reaction enables multiple bond-forming events including C−X (X=O, N
我们提出了钯催化环化多米诺/磷酸化宝石-dibromoolefins,其利用H-次膦酸酯和仲膦氧化物的混合物作为膦源,分别。以中等至良好的产率获得了多种磷酸化杂芳烃,并具有广泛的官能团兼容性。这种一锅法反应可以使用容易获得的起始材料实现多种键形成事件,包括 C-X (X=O, N, S) 和 C-P 键。此外,该协议可以轻松应用于大规模制备和后期功能化。
Synthesis of Phosphaisocoumarins through Rhodium-Catalyzed Cyclization Using Alkynes and Arylphosphonic Acid Monoesters
作者:Jungmin Seo、Youngchul Park、Incheol Jeon、Taekyu Ryu、Sangjune Park、Phil Ho Lee
DOI:10.1021/ol401407v
日期:2013.7.5
A rhodium-catalyzed cyclization using alkynes and arylphosphonic acidmonoesters for the synthesis of phosphaisocoumarins is reported. A number of arylphosphonic acidmonoesters were selectively cyclized in high yields with functional group tolerance. In addition, unsymmetrical alkynes are applied in high regioselectivity.
We report a new flexible method for the synthesis of 2-functionalized benzo[b]furans and indoles from readily available o-(2,2-dibromovinyl)-phenol, -aniline or -acetanilide using a tandem Pd-assisted cyclization–coupling reaction.
我们报告了一种新的灵活的方法,可使用串联的Pd辅助环化-偶联反应从易于获得的邻-(2,2-二溴乙烯基)-苯酚,-苯胺或-对乙酰苯胺中合成2-官能化的苯并[ b ]呋喃和吲哚。。