The effects of phosphorus substituents on the reactivity of α‐alkoxyphosphonium salts with nucleophiles has been explored. Reactions of α‐alkoxyphosphonium salts, prepared from various acetals and tris(o‐tolyl)phosphine, with a variety of nucleophiles proceeded efficiently. These processes represent the first examples of high‐yielding nucleophilic substitution reactions of α‐alkoxyphosphonium salts
Iridium(I) complexes having an imidazol-2-ylidene ligand with benzylic wingtips efficiently catalyzed the β-alkylation of secondary alcohols with primary alcohols and acceptorless dehydrogenative cyclization of 2-aminobenzyl alcohol with ketonesthrough a borrowinghydrogen pathway. The β-alkylated alcohols, including cholesterol derivatives, and substituted quinolines were obtained in good yields
Ruthenium Phosphine–Pyridone Catalyzed Cross-Coupling of Alcohols To form α-Alkylated Ketones
作者:Apurba R. Sahoo、Gummidi Lalitha、V. Murugesh、Christian Bruneau、Gangavaram V. M. Sharma、Surisetti Suresh、Mathieu Achard
DOI:10.1021/acs.joc.7b02042
日期:2017.10.6
An efficient and green route to access diverse functionalized ketones via dehydrogenative–dehydrative cross-coupling of primary and secondary alcohols is demonstrated. Selective and tunable formation of ketones or alcohols is catalyzed by a recently developed proton responsive ruthenium phosphine–pyridone complex. Light alcohols such as ethanol could be used as alkylating agents in this methodology
作者:Mehmet Sevim、Serdar Batıkan Kavukcu、Armağan Kınal、Onur Şahin、Hayati Türkmen
DOI:10.1039/d0dt02937h
日期:——
under mild conditions. These complexes were able to perform this catalytic transformation in a short time with low catalyst and base amounts under an air atmosphere. Also, the PdII–nitron complexes (6–9) were applied in the Suzuki–Miyaura C–C coupling reaction and these complexes successfully initiated this reaction in a short time (30 minutes) using the H2O/2-propanol (1.5 : 0.5) solvent system. The
一系列的Ru II(1),铑III(2),IR III(3,4),IR我(5)和Pd II(6-9制备和表征通过) '瞬间卡宾'硝酮的复合物1 H-和13 C-NMR,FT-IR和元素分析。配合物1-4和6的分子结构通过X射线衍射研究确定。在酮与醇的α(α)-烷基化反应中,通过乙胺(α-)烷基化反应评价了配合物(1-9)的催化活性。温和条件下的借用氢战略。这些络合物能够在短时间内在空气气氛下以低催化剂和碱量进行这种催化转化。同样,Pd II-硝基络合物(6-9)用于Suzuki-Miyaura C-C偶联反应,这些络合物使用H 2 O / 2-丙醇(30分钟)在短时间内成功引发了该反应。1.5:0.5)溶剂系统。DFT计算表明,对于该机理,Pd 0 / II / 0途径更为可取。