衍生自具有不同连接子的2-(吡啶-2-基)苯并[d]噻唑(PBT)的六齿三齿NNN配体前体PBT NN X N(X = NH,NMe,O,S)(1a – 1f)具有已经准备好了。PBT NN X N配体的电子性质可通过PBT骨架和吡啶环之间的不同连接基和/或通过在吡啶环上引入给电子/吸电子基团(R = OMe或F)很好地调节。配体前体和代表性络合物Ru(PBT NN NH N)Cl 2(PPh 3)(2a),Ru(PBT NNNMe N)Cl 2(PPh 3)( 2b)和Ru( PBT NN S N)Cl 2(PPh 3)( 2f)的特征已通过NMR光谱,高分辨率质谱和傅立叶变换红外(FT- IR)。1f, 2a和2f的分子结构已通过X射线衍射研究确定。结果表明,复合物中的PBT NN NH N配体与两个五元螯合环共面。应该注意的是2a与其他连接子(如NMe,O或S)相比,具有NH基团的分
ω-Hydroxy ketones and diketones, which are important starting materials for the synthesis of cycloalkanones and heterocyclic compounds, were prepared by the one-step reaction of methyl ketones with α,ω-diols under the influence of an iridium complex and a base. The selectivity of ω-hydroxy ketones and diketones could be controlled by varying the starting ratio of methyl ketones to α,ω-diols. For example, reaction using acetophenone (5 equiv) with respect to 1,6-hexanediol (1 equiv) in the presence of [IrCl(cod)]2, PPh3, and KOH without solvent gave 1,10-diphenyl-1,10-decanedione in almost quantitative yield, while reaction using acetophenone (1 equiv) to 1,6-hexanediol (4 equiv) led to 8-hydroxy-1-phenyl-1-octanone in 92% yield. This methodology was successfully extended to the reaction of arylacetonitriles with α,ω-diols leading to diaryldinitriles.
Atmosphere-Controlled Chemoselectivity: Rhodium-Catalyzed Alkylation and Olefination of Alkylnitriles with Alcohols
作者:Junjun Li、Yuxuan Liu、Weijun Tang、Dong Xue、Chaoqun Li、Jianliang Xiao、Chao Wang
DOI:10.1002/chem.201704037
日期:2017.10.17
The chemoselectivealkylation and olefination of alkylnitriles with alcohols have been developed by simply controlling the reaction atmosphere. A binuclear rhodium complex catalyzes the alkylation reaction under argon through a hydrogen‐borrowing pathway and the olefination reaction under oxygen through aerobic dehydrogenation. Broad substrate scope is demonstrated, permitting the synthesis of some