The Palladium-Catalyzed Hydroarylation and Hydrovinylation of Tertiary 3-(o-Acetoxyaryl)- and 3-(o-Benzoyloxyaryl)propynols − A Route to 4-Aryl- and 4-Vinyl-2,2-Dimethyl-3-chromenes
摘要:
The palladium-catalyzed hydroarylation and hydrovinylation of tertiary 3-(o-acetoxyaryl)- and 3-(o-benzoyloxyaryl) propynols provides a regio- and stereoselective route to allylic alcohols with aryl and vinyl substituents which can be readily converted into the corresponding chromene derivatives. The hydroarylation and hydrovinylation reaction is believed to proceed through a carbopalladation step whose regiochemistry is primarily controlled by the directing effect of the tertiary hydroxy group.
The Palladium-Catalyzed Hydroarylation and Hydrovinylation of Tertiary 3-(o-Acetoxyaryl)- and 3-(o-Benzoyloxyaryl)propynols − A Route to 4-Aryl- and 4-Vinyl-2,2-Dimethyl-3-chromenes
摘要:
The palladium-catalyzed hydroarylation and hydrovinylation of tertiary 3-(o-acetoxyaryl)- and 3-(o-benzoyloxyaryl) propynols provides a regio- and stereoselective route to allylic alcohols with aryl and vinyl substituents which can be readily converted into the corresponding chromene derivatives. The hydroarylation and hydrovinylation reaction is believed to proceed through a carbopalladation step whose regiochemistry is primarily controlled by the directing effect of the tertiary hydroxy group.
The reaction of alkynes with vinyltriflates in the presence of catalytic amounts of Pd(OAc)2 and HCOOK, omitting phosphane ligands, affords hydrovinylation products usually in good to high yields. The reaction has been employed to develop a regioselective synthesis of 3-vinylfuran-2(5H)-ones from methyl 4-hydroxy-2-butynoates.
Copper(II) Bromide Catalyzed Novel Preparation of Propargylic Ethers and Sulfides by S<sub>N</sub>1-Type Substitution between Propargylic Alcohols and Alcohols or Thiols
A general and efficient copper(II) bromide catalyzed substitution reaction of propargylicalcohols with carbon and heteroatom-centered nucleophiles, such as alcohols and thiols, leading to the construction of C-O and C-S bonds has been developed. High product yields were obtained with excellent regioselectivity.
已经开发了一种通用且高效的溴化铜 (II) 催化炔丙醇与碳和以杂原子为中心的亲核试剂(如醇和硫醇)的取代反应,从而构建 CO 和 CS 键。以优异的区域选择性获得了高产率。
The Palladium-Catalyzed Hydroarylation and Hydrovinylation of Tertiary 3-(o-Acetoxyaryl)- and 3-(o-Benzoyloxyaryl)propynols − A Route to 4-Aryl- and 4-Vinyl-2,2-Dimethyl-3-chromenes
作者:Antonio Arcadi、Sandro Cacchi、Giancarlo Fabrizi、Fabio Marinelli、Paola Pace
The palladium-catalyzed hydroarylation and hydrovinylation of tertiary 3-(o-acetoxyaryl)- and 3-(o-benzoyloxyaryl) propynols provides a regio- and stereoselective route to allylic alcohols with aryl and vinyl substituents which can be readily converted into the corresponding chromene derivatives. The hydroarylation and hydrovinylation reaction is believed to proceed through a carbopalladation step whose regiochemistry is primarily controlled by the directing effect of the tertiary hydroxy group.