The palladium-catalyzed cross-coupling of dialkylphosphite with aromatic electrophiles (Hirao coupling) was re-investigated. Some limitations in terms of palladium loadings and substrate reactivity are alleviated with the use of Pd(OAc)(2) complexed to 1,1'-bis(diphenylphosphino) ferrocene (dppf) as a ligand. Various aryl and heteroaryl halides are employed to deliver both known and novel substituted phosphonates. The first examples of aryl chloride couplings are also reported. (C) 2008 Elsevier B.V. All rights reserved.
Pd-catalyzed C–P coupling of heteroaryl boronic acid with H-phosphonate diester
We report herein a novel protocol to construct C-P bond from heteroaryl boronic acid with H-phosphonate diester under Pd-Ag catalyzed system without addition of base. This method, directly using commercial available heteroaryl boronic acid as the starting material, provides a new way to synthesize a variety of useful heteroaryl phosphonates. (C) 2016 Elsevier Ltd. All rights reserved.
N-Heteroarylphosphonates, Part II. Synthesis and Reactions of 2- and 4-Phosphonatoquinolines and Related Compounds
作者:Mirko Haase
DOI:10.1055/s-1999-3627
日期:1999.12
US4187378A
申请人:——
公开号:US4187378A
公开(公告)日:1980-02-05
Preparation of pyridyl-4-phosphonates
申请人:Petrolite Corporation
公开号:US04187378A1
公开(公告)日:1980-02-05
This invention relates to the preparation of pyridyl-4-phosphonates by reacting phosphite ester salts with pyridines which are N-substituted with sterically hindering or "bulky" groups such as "bulky" phenyl groups, for example trityl, .phi..sub.3 C-.