[EN] METHODS FOR PHOSPHINE OXIDE REDUCTION IN CATALYTIC WITTIG REACTIONS<br/>[FR] PROCÉDÉS POUR LA RÉDUCTION D'UN OXYDE DE PHOSPHINE DANS DES RÉACTIONS DE WITTIG CATALYTIQUES
申请人:UNIV DUBLIN CITY
公开号:WO2014140353A1
公开(公告)日:2014-09-18
A method for increasing the rate of phosphine oxide reduction, preferably during a Wittig reaction comprising use of an acid additive is provided. A room temperature catalytic Wittig reaction (CWR) the rate of reduction of the phosphine oxide is increased due to the addition of the acid additive is described. Furthermore, the extension of the CWR to semi-stabilized and non-stabilized ylides has been accomplished by utilization of a masked base and/or ylide-tuning.
Recycling the Waste: The Development of a Catalytic Wittig Reaction
作者:Christopher J. O'Brien、Jennifer L. Tellez、Zachary S. Nixon、Lauren J. Kang、Andra L. Carter、Stephen R. Kunkel、Katherine C. Przeworski、Gregory A. Chass
DOI:10.1002/anie.200902525
日期:2009.9.1
It's all in the ring: 3‐Methyl‐1‐phenylphospholane‐1‐oxide (4–10 mol %) and an organosilane reducing agent are the key components in the first Wittigreactioncatalytic in phosphine. The protocol also functions well on larger scale: a reaction on a 30 mmol scale yielded 3.39 g of product, corresponding to a yield of 67 %.
A catalytic Wittig method utilizing a phosphine including the steps of providing a phosphine oxide precatalyst and reducing the phosphine oxide precatalyst to produce the phosphine; forming a phosphonium ylide precursor from the phosphine and a reactant; generating a phosphonium ylide from the phosphonium ylide precursor; reacting the phosphonium ylide precursor with the aldehyde, ketone, or ester to form the olefin and the phosphine oxide which then reenters the cycle. The invention is also directed to a Mitsunobu reaction catalytic in phosphine.
METHODS FOR PHOSPHINE OXIDE REDUCTION IN CATALYTIC WITTIG REACTIONS
申请人:DUBLIN CITY UNIVERSITY
公开号:US20160016860A1
公开(公告)日:2016-01-21
A method for increasing the rate of phosphine oxide reduction, preferably during a Wittig reaction comprising use of an acid additive is provided. A room temperature catalytic Wittig reaction (CWR) the rate of reduction of the phosphine oxide is increased due to the addition of the acid additive is described. Furthermore, the extension of the CWR to semi-stabilized and non-stabilized ylides has been accomplished by utilization of a masked base and/or ylide-tuning.