H-膦酸二苯酯在无水反应条件下发生碱促进的歧化成亚磷酸三苯酯和H-膦酸苯酯。根据31 P NMR数据,提出了这种转化的最可能机理。为了证实这些发现并更深入地了解芳基H-膦酸酯的化学性质,我们还进行了一些有关用各种缩合剂活化苯基和二苯基H-膦酸酯的研究。我们发现,膦酸的芳基对烷基酯通常在活化过程中遵循不同的反应途径,这很可能可以追溯到磷中心的较高亲电性和芳基H-膦酸酯衍生物中PH键的较高反应性。
Substituent-Controlled Chemoselective Cleavage of C═C or C<sub>sp<sup>2</sup></sub>–C(CO) Bond in α,β-Unsaturated Carbonyl Compounds with H-Phosphonates Leading to β-Ketophosphonates
作者:Yao Zhou、Changqing Rao、Shaoyu Mai、Qiuling Song
DOI:10.1021/acs.joc.5b02887
日期:2016.3.4
An unprecedented substituent-controlled chemoselectivecleavage of C═C double bond or C(sp2)–C(CO) bond along with aerobic phosphorylation of α,β-unsaturated carbonyl compounds with H-phosphonates through a radical process has been disclosed. The current strategy provides an access to β-ketophosphonates under mild conditions with a wide substrate scope.
[EN] METAL-FREE DIRECT ARYLATION OF DIALKYL PHOSPHONATES FOR THE SYNTHESIS OF MIXED ALKYL ARYL PHOSPHONATES<br/>[FR] ARYLATION DIRECTE SANS MÉTAL DE PHOSPHONATES DE DIALKYLE POUR LA SYNTHÈSE DE PHOSPHONATES D'ARYLE ALKYLE MIXTES
申请人:THE BOARD OF REGENTS OF THE NEVADA SYSTEM OF HIGHER EDUCATION ON BEHALF OF THE UNIV OF NEVADA LAS VE
公开号:WO2019028391A1
公开(公告)日:2019-02-07
Provided herein are phosphates, thiophosphates, phosphonates, and phosphinates, methods of making same, and methods of using these compounds and methods for the generation of pharmaceutically relevant phosphate, phosphonate, and phosphinate analogs. 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.
The first facile, efficient, atom-economical and regioselective palladium-catalyzed direct C–P cross-coupling of unprotected allenic alcohols with H-phosphonates for the one-pot synthesis of structurally diverse multisubstituted 2-phosphinoyl-1,3-butadienes was developed. This strategy would enrich the allene chemistry and afford new scaffolds to construct complex molecular skeletons.
Preparation of Vinylphosphonates from Ketones Promoted by Tf<sub>2</sub>O
作者:Nana Xin、Yongzheng Lv、Yongjian Lian、Zhu Lin、Xian-Qiang Huang、Chang-Qiu Zhao、Yanlan Wang
DOI:10.1021/acs.joc.2c02563
日期:2023.3.3
conditions. Both aryl and alkyl ketones could perform smoothly to give vinyl phosphonates in high to excellent yields. In addition, the reaction was easy to carry out and easy to scale up. Mechanistic studies suggested that this transformation might involve nucleophilic vinylic substitution or a nucleophilic addition–elimination mechanism.
Peroxides as “Switches” of Dialkyl <i>H</i>-Phosphonate: Two Mild and Metal-Free Methods for Preparation of 2-Acylbenzothiazoles and Dialkyl Benzothiazol-2-ylphosphonates
Two mild and metal-free methods for the preparation of two kinds of important benzothiazole derivatives, 2-acylbenzothiazoles and dialkyl benzothiazol-2-ylphosphonates, respectively, were developed. The diallcyl H-phosphonate (RO)(2)P(O)H exists in equilibrium with its tautomer dialkyl phosphite (RO)(2)POH. TBHP triggered alpha-carbon-centered phosphite radical formation, whereas DTBP triggered phosphorus-centered phosphonate radical formation. The two types of radicals led respectively to two different reaction processes, the direct C-2-acylation of benzothiazoles and C-2-phosphonation of benzothiazoles.