Oxidation–Reduction Condensation of Diazaphosphites for Carbon–Heteroatom Bond Formation Based on Mitsunobu Mechanism
作者:Hai Huang、Jun Yong Kang
DOI:10.1021/acs.orglett.6b03709
日期:2017.2.3
An efficient oxidation–reduction condensation reaction of diazaphosphites with various nonacidic pronucleophiles in the presence of DIAD as a weak oxidant has been developed for carbon–heteroatombond formation. This mild process affords structurally diverse tertiary amines, secondary amines, esters, ethers, and thioethers in moderate to excellent yields. The selective synthesis of secondary amines
2-Diphenylphosphanyl-1,3,2-diazaphospholidines were prepared via metathesis from 2-chloro-1,3,2-diazaphospholidines and LiPPh2. For some of the products, symmetrisation to tetraphenyldiphosphane and 2,2′-bis-1,3,2-diazaphospholidinyls was observed. Most of the derivatives were characterised by single-crystal X-ray diffraction, which showed that all compounds studied feature elongated exocyclic P–Cl
Amine-Catalyzed Phospha-Michael Reaction of α,β-Unsaturated Aldehydes and Ketones with Multifunctional <i>N</i>-Heterocyclic Phosphine-Thioureas as Phosphonylation Reagent
作者:Hai Huang、Jun Yong Kang
DOI:10.1021/acs.orglett.6b02121
日期:2016.9.2
amine-catalyzed phospha-Michael addition reaction of α,β-unsaturatedaldehydes/ketones with N-heterocyclic phosphines for the synthesis of γ-ketodiazaphosphonates has been developed. With freedom from nucleophile additives, this mild process affords a range of structurally diverse γ-ketodiazaphosphonates in moderate to excellent yields. Importantly, various α,β-unsaturated ketones were also tolerated in this
申请人:The Board of Regents of the Nevada System of Higher Education on Behalf of the Unive. of Nevada
公开号:US20180118770A1
公开(公告)日:2018-05-03
Provided herein are N-heterocyclic phosphines (NHPs) useful in metal-free phosphorus-carbon bond forming reactions. Methods for preparing vinylphosphonates using NHPs also are provided. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.
Regioselective Synthesis of α- and <i>γ-</i>Amino Quinolinyl Phosphonamides Using <i>N</i>-Heterocyclic Phosphines (NHPs)
作者:Manasa Shetty、Hai Huang、Jun Yong Kang
DOI:10.1021/acs.orglett.7b03829
日期:2018.2.2
phosphonylation of quinolines for the synthesis of α-amino quinolinyl phosphonamides and γ-amino quinolinyl phosphonamides has been developed under mild reaction conditions. An NHP-thiourea enables selective synthesis of α-amino quinolinyl phosphonamides by a Reissert-type reaction, and an NHP-tosylamide affords γ-amino quinolinyl phosphonamides via a 1,4-conjugate addition reaction. The corresponding amino