Iridium-Catalyzed Highly Efficient and Site-Selective Deoxygenation of Alcohols
作者:Shiyi Yang、Weiping Tang、Zhanhui Yang、Jiaxi Xu
DOI:10.1021/acscatal.8b02495
日期:2018.10.5
An iridium-catalyzed, highly efficient, and site-selective deoxygenation of primary, secondary, and tertiary alcohols has been realized, under the assistance of a 4-(N-substituted amino)aryl directing group. Only the hydroxyl adjacent to the directing group can be deoxygenated. The deoxygenation is performed in water, with formic acid as both the promoter and hydride donor. Excellent yields and functionality
Direct α-Alkylation of Aldehydes by Brønsted-Acid Catalysis
作者:Xiangrong Zhu、Ting Wang、Qixiang Guo
DOI:10.1002/cjoc.201100464
日期:2012.1
A Brønstedacid catalyzed directalkylation reaction of aldehydes was described. The 3,5‐dinitrobenzoic acid promoted the reaction between aldehydes and diarylmethanols to afford the corresponding alkylation products with middle to high yields (up to 91% yield).
This work describes an efficient α-alkylation reaction of α-amino aldehydes with 3-indolylmethanols. In the promotion of catalyst 3f, the target products were obtained in high yields (up to 99%), good diastereoselectivities (up to 88:12), and excellent enantioselectivities (up to 96% ee). The direct alkylation products can be readily converted into other tryptophan derivatives without the loss of stereoselectivities
A general Brønsted acid-catalyzed allylation of benzhydryl alcohols
作者:Ifedi Orizu、Yuri Bolshan
DOI:10.1016/j.tetlet.2016.11.044
日期:2016.12
Efficient Brønstedacid-catalyzed allylation of benzhydryl alcohols has been developed. The reaction occurs within 5 min in the presence of sub-stoichiometric amounts of HBF4·OEt2 to afford the desired products in good to excellent yields. A variety of functional groups were tolerated under the developed conditions including amides, aldehydes, hydroxyl and carboxylic acid.
Synergistic Stereoselective Organocatalysis with Indium(III) Salts
作者:Pier Cozzi、Andrea Gualandi、Luca Mengozzi、Claire Wilson
DOI:10.1055/s-0033-1341022
日期:——
of such indium(III)-promotedorganocatalytic procedures is the focus of our recent research, a summary of which is presented in this article. The compatibility of indium(III) Lewis acids with water and amines allows their employment in synergistic and cooperative catalysis. Stereoselective organocatalyticSN1-typereactions, in which carbenium ions are generated, are promoted by the presence of indium
摘要 铟(III)路易斯酸与水和胺的相容性使其可用于协同催化和协同催化。铟盐的存在促进了其中生成碳正离子的立体选择性有机催化S N 1型反应。可以在有机催化中利用铟盐的特殊性质来设计与水相容的,良性的,绿色的工艺。这种铟(III)促进的有机催化方法的发展是我们最近研究的重点,本文对此进行了总结。 铟(III)路易斯酸与水和胺的相容性使其可用于协同催化和协同催化。铟盐的存在促进了其中生成碳正离子的立体选择性有机催化S N 1型反应。可以在有机催化中利用铟盐的特殊性质来设计与水相容的,良性的,绿色的工艺。这种铟(III)促进的有机催化方法的发展是我们最近研究的重点,本文对此进行了总结。