最近氘代候选药物的应用激增,迫切需要各种氘标记技术。在此,开发了一种高效的 Rh 催化的氘代 Tsuji-Wilkinson 用 D 2 O 对天然可用的醛进行脱羰反应。在该反应中,D 2 O 不仅充当氘代试剂和溶剂,而且还促进 Rh 催化的脱羰。此外,从 α,β-不饱和醛合成末端单氘代烯烃的脱羰策略也触手可及。
Reduced to clear: The reduction of phosphineoxides, sulfoxides, and amine N-oxides is achieved by using bis(2-chlorophenyl)borinic acid /phenylsilane. The reaction tolerates a wide range of substrates and can be performed under mild conditions with only a 2.5 mol % loading of the catalyst. NMR spectroscopy indicates that a borohydride is the key reducing species, and thus, bis(2-chlorophenyl)borinic
The first one‐pot tandem Michael addition/enantioselective Conia‐ene cyclization of N‐protected prop‐2‐yn‐1‐amines with 2‐methylene‐3‐oxoalkanoates promoted by chiral iron(III)/silver(I) cooperative catalysts has been developed. Alkyl 4‐methylenepyrrolidine‐3‐acyl‐3‐carboxylates, which can be transformed into β‐proline derivatives, are obtained in high yield with high enantioselectivity.
PROCESS FOR DOUBLE CARBONYLATION OF ALLYL ALCOHOLS TO CORRESPONDING DIESTERS
申请人:EVONIK DEGUSSA GMBH
公开号:US20170174610A1
公开(公告)日:2017-06-22
The invention relates to a process for doubly carbonylating allyl alcohols to the corresponding diesters, wherein a linear or branched allyl alcohol is reacted with a linear or branched alkanol (alcohol) with supply of CO and in the presence of a catalytic system composed of a palladium complex and at least one organic phosphorus ligand and in the presence of a hydrogen halide selected from HCl, HBr and HI.
Xantphos or Xantphos chalcogenide complexes with general folmula [PdCl2(X∩X)] (where X = P, O, S or Se) were synthesized by the addition of corresponding ligands to [PdCl2(COD)] (COD = 1,5-cyclooctadiene). Prepared Complexes [PdCl2(Xantphos)] and [PdCl2(Xantphos = S)] showed distorted square planar geometries, from X-ray crystallographic analysis. All of the prepared complexes showed activity toward intermolecular
PROCESS FOR DOUBLE CARBONYLATION OF ALLYL ETHERS TO CORRESPONDING DIESTERS
申请人:EVONIK DEGUSSA GMBH
公开号:US20170174609A1
公开(公告)日:2017-06-22
The invention relates to a process for doubly carbonylating allyl ethers to the corresponding diesters, wherein a linear or branched allyl ether is reacted with a linear or branched alkanol (alcohol) with supply of CO and in the presence of a catalytic system composed of a palladium complex and at least one organic phosphorus ligand and in the presence of a hydrogen halide selected from HCl, HBr and HI.