A Brønsted acid catalyzed C3-selective tert-alkylation of indoles using tertiary propargylic and benzylic alcohols has been developed. New C3-propargylated indole derivatives with a quaternary carbon at the propargylic position have been efficiently synthesized. Reactions were performed in air with undried solvents, and water was the only side product of the process.
Palladium/H<sup>+</sup>-cocatalyzed kinetic resolution of tertiary propargylic alcohols
作者:Wanli Zhang、Shengming Ma
DOI:10.1039/c8cc01949e
日期:——
A new approach to not-readily-available opticallyactive tertiary propargylic alcohols through palladium/H+-cocatalyzed carboxylation of racemic tertiary propargylic alcohols with CO and MeOH has been described. Bothenantiomers can be obtained with no less than 90% ee utilizing (R) or (S)-DTBM-Segphos. Various transformations of the opticallyactive alcohols have been demonstrated.
已经描述了通过钯/ H + -外消旋的叔炔丙醇与CO和MeOH的羧化羧化反应来制备尚未得到的旋光性叔炔丙醇的新方法。利用(R)或(S)-DTBM-Segphos,两种对映体都可以以不小于90%的ee获得。已经证明了旋光性醇的各种转化。
Palladium catalyzed regioselective elimination–hydrocarbonylation of propargylic alcohols
作者:Yuan Yuan、Minqiang Jia、Wanli Zhang、Shengming Ma
DOI:10.1039/c9cc03262b
日期:——
A straightforward approach to synthesizing substituted 1,3-alkadien-2-yl carboxylic acids starting from readily available propargylicalcohols was developed. Based on mechanistic studies, the reaction was found to proceed via regioselective hydrocarbonylation of the C–C triple bonds of the in situ formed 1,3-enyne intermediates, providing 1,3-alkadien-2-yl carboxylic acids with a very high selectivity
Catalytic transient leaving group for atom-economic synthesis of allenes from 2-alkynols
作者:Wanli Zhang、Chaofan Huang、Yuan Yuan、Shengming Ma
DOI:10.1039/c7cc06866b
日期:——
alcohols, has been established. Under the cooperative binary catalysis of Pd and a phosphoric acid, the reaction afforded multi-substituted allenoates with a broad scope tolerating useful functional groups. Synthetic potentials of obtained products have been demonstrated.
Gold-Catalyzed Hydroamination of Propargylic Alcohols: Controlling Divergent Catalytic Reaction Pathways To Access 1,3-Amino Alcohols, 3-Hydroxyketones, or 3-Aminoketones
作者:Victor Laserna、Michael J. Porter、Tom D. Sheppard
DOI:10.1021/acs.joc.9b00988
日期:2019.9.20
Alternatively, by using a catalytic quantity of aniline, 3-hydroxyketones can be obtained in high yield directly from propargylic alcohols. Further manipulation of the reaction conditions enables the selective formation of 3-aminoketones via a rearrangement/hydroamination pathway. The utility of the new chemistry was exemplified by the one-pot synthesis of a selection of N-arylpyrrolidines and N-arylpiperidines