Manganese-Catalyzed and Promoted Reactions of<i>H</i>-Phosphinate Esters
作者:Henry C. Fisher、Olivier Berger、Fabien Gelat、Jean-Luc Montchamp
DOI:10.1002/adsc.201301157
日期:2014.4.14
with alkenes and alkynes using catalytic manganese(II) acetate. Under stoichiometric conditions with manganese(III) acetate or with catalytic manganese(II) acetate+excess manganese(II) oxide various reactions like arylation or cyclization through radical oxidative arylation can take place. Whereas the chemistry of manganese is already well developed for the functionalization of H‐phosphonates, the present
hydrophosphinylation of unactivated alkenes with H-phosphinates and hypophosphorous acid under radicalfree conditions is presented. The reaction affords selectively a large number of structurally diverse organophosphorous compounds in moderate to good yields under mild reaction conditions in the presence of an organic sensitizer as catalyst irradiated by UV-A LEDs. Furthermore, the high yielding hydrophosphinylation
提出了在自由基条件下用H-次膦酸盐和次磷酸对未活化的烯烃进行 UV 介导的氢膦酰化反应。在有机敏化剂作为催化剂的情况下,在 UV-A LED 照射下,该反应在温和的反应条件下以中等至良好的产率选择性地提供大量结构多样的有机磷化合物。此外,公开了连续流中的高产率氢膦酰化。
Manganese-mediated alkene chloro-phosphinoylation
作者:Vincent Richard、Henry C. Fisher、Jean-Luc Montchamp
DOI:10.1016/j.tetlet.2014.12.050
日期:2015.6
The Mn(II)/Mn(IV) system was used to achieve the bisfunctionalization of alkenes with phosphorus and chlorine in moderate to good yields. A variety of phosphinylidene-containing (P(O)H) compounds were examined. When the phosphorus reagent is limiting, the reaction yield is generally in the 40–50% range, although the structure of the organophosphorus starting material greatly influences it. The reaction
Phosphorus-Carbon Bond Formation: Palladium-Catalyzed Cross-Coupling of<i>H</i>-Phosphinates and Other P(O)H-Containing Compounds
作者:Olivier Berger、Christelle Petit、Eric L. Deal、Jean-Luc Montchamp
DOI:10.1002/adsc.201300069
日期:2013.5.3
developed for the cross‐coupling of P(O)H compounds with Csp2X and related partners. Palladium catalysis using a ligand/additive combination, typically either xantphos/ethylene glycol or 1,1′‐bis(diphenylphosphino)ferrocene/1,2‐dimethoxyethane, with diisopropylethylamine as the base, proved to be generally useful for the synthesis of numerous PC containing compounds. Routinely, 2 mol% of catalyst are
The Pd-catalyzed direct alkylation of H-phosphinic acids and hypophosphorous acid with allylic/benzylic alcohols has been described previously. Here, the extension of this methodology to H-phosphinate esters is presented. The new reaction appears general, although its scope is narrower than with the acids, and its mechanism is likely different. Various alcohols are examined in their reaction with phosphinylidene