Palladium-Catalyzed Intramolecular C−O Bond Formation
摘要:
A number of oxygen heterocycles were synthesized using the palladium-catalyzed intramolecular etherification of aryl halides by employing di-tert-butylphosphinobiaryl ligands. The reaction proceeds under mild conditions using weak bases such as Cs2CO3 or K3PO4. A variety of functional groups are tolerated in the reaction. and enantioenriched alcohols can be coupled without erosion of optical purity. The mildness of the reaction conditions allows for the use of polyfunctionalized substrates. This method was used as the key step in the synthesis of MKC-242, an antidepressant currently in clinical trials. The synthesis of MKC-242 was achieved in 40% overall yield from commercially available sesamol and acrylonitrile,
Use of 5-HTiA receptor ligands for the treatment of glaucoma
申请人:MITSUBISHI CHEMICAL CORPORATION
公开号:EP0771563A2
公开(公告)日:1997-05-07
This invention is aimed at providing a novel medicine for oculopathy, which has as an active component thereof a 5-HT1A receptor ligand such as, for example, an alkylene dioxybenzene derivative represented by the following formula (I)
(wherein m represents an integer in the range of 2 - 5 and n an integer in the range of 1 - 3), a racemate thereof, or an acid added salt thereof.
Pd-Catalyzed Asymmetric Intramolecular Aryl C–O Bond Formation with SDP(O) Ligand: Enantioselective Synthesis of (2,3-Dihydrobenzo[<i>b</i>][1,4]dioxin-2-yl)methanols
作者:Jialing Shi、Ting Wang、Yusha Huang、Xinhao Zhang、Yun-Dong Wu、Qian Cai
DOI:10.1021/ol5036613
日期:2015.2.20
Employing a chiral spirodiphosphine monoxide ligand with 1,1'-spirobiindane backbone (SDP(O)), a desymmetrization strategy of Pd-catalyzed intramolecular asymmetric aryl C-O coupling of 2-(2-halophenoxy)propane-1,3-diols, was developed. The SDP(O) ligand shows much better results than its SDP counterpart. The protocol provides an efficient and highly enantioselective method for the synthesis of 2-hydroxymethyl-1,4-benzodioxanes. Density functional theory studies provide a model that accounts for the origin of the enantioselectivity.