A Functional-Group-Tolerant Catalytictrans Hydrogenation of Alkynes
摘要:
Against the rules: during the hundred years following Sabatier's groundbreaking work on catalytic hydrogenation, syn delivery of the H atoms to the π system of a substrate remained the governing stereochemical rule. An exception has now be found with the use of cationic [Cp*Ru] templates, which accounts for the first practical, functional-group-tolerant, broadly applicable and highly E-selective semihydrogenation method for alkynes.
A<i>trans</i>-Selective Hydroboration of Internal Alkynes
作者:Basker Sundararaju、Alois Fürstner
DOI:10.1002/anie.201307584
日期:2013.12.23
the rule: The reigning stereochemical principle of hydroboration is the suprafacial delivery of hydrogen and boron to the same π‐face of a given starting material. This fundamental rule of cis addition is now easily broken for internalalkynes with the help of [Cp*Ru(MeCN)3]PF6 (Cp*=η5‐C5Me5) as the catalyst. The resulting trans‐selective hydroboration opens a practical new entry into E‐configured alkenylboron
[EN] PROCESS FOR THE TRANS-SELECTIVE HYDROBORATION OF INTERNAL ALKYNES<br/>[FR] PROCÉDÉ D'HYDROBORATION TRANS-SELECTIVE D'ALKYNES INTERNES
申请人:STUDIENGESELLSCHAFT KOHLE MBH
公开号:WO2015049257A1
公开(公告)日:2015-04-09
The present invention refers to a process for the trans-selective hydroboration of internal alkynes and the so-obtained products. The inventive process makes use of a borane of the formula X1X2BH selected from the group of dialkyl boranes or di(alkoxy)boranes which are reacted with the internal alkynes in the presence of a cyclyopentadienyl-coordinated ruthenium catalyst.