作者:Dominik Gärtner、André Luiz Stein、Sabine Grupe、Johannes Arp、Axel Jacobi von Wangelin
DOI:10.1002/anie.201504524
日期:2015.9.1
unreactive in cross‐coupling reactions which mostly employ more electrophilic halides or activated esters (triflates, tosylates). Acetates are cheap and easily accessible electrophiles but have not been used in cross‐couplings because the strong CO bond and high propensity to engage in unwanted acetylation and deprotonation. Reported herein is a selective iron‐catalyzedcross‐coupling of diverse alkenyl
X-ray structure and conformation of some enol acetates derived from simple ketones
作者:Ewan Boyd、Svitlana Buksha、Gregory S. Coumbarides、Marco Dingjan、Jason Eames、Ray V. H. Jones、Majid Motevalli、Rachel A. Stenson、Michael J. Suggate
DOI:10.1007/s10870-006-9081-9
日期:2007.3.6
The conformational arrangements of a series of enol acetates derived from simple ketones have been examined by X-ray crystallography. For this series, the carbonyl enol motif was found to adopt a similar conformation.
已经通过 X 射线晶体学检查了一系列衍生自简单酮的烯醇乙酸酯的构象排列。对于该系列,发现羰基烯醇基序采用类似的构象。
Desymmetrisation of prochiral ketones by catalytic enantioselective hydrolysis of their enol esters using enzymes
作者:Andrew J Carnell、Jim Barkley、Amarjit Singh
DOI:10.1016/s0040-4039(97)01817-0
日期:1997.11
Desymmetrisation of 4-cyano-4-phenylcyclohexanone 1 has been achieved by enzyme-catalysed enantioselective alcoholysis with n-butanol of the derived racemic enol acetate 2 in tetrahydrofuran. The absolute configuration of the enol acetate (−)-(S)-2 (100% e.e.) obtained was determined by X-ray analysis of the camphanyl derivative 7.
Cyclohexynes are effectively generated by treatment of cyclohex-1-enyliodonium salts with a mild base such as acetate and fluoride ion in chloroform. Regioselectivity of the nucleophilic addition of acetate ion to cyclohexynes depends on the 4-substituent.
CH Alkenylations with Alkenyl Acetates, Phosphates, Carbonates, and Carbamates by Cobalt Catalysis at 23 °C
作者:Marc Moselage、Nicolas Sauermann、Sven C. Richter、Lutz Ackermann
DOI:10.1002/anie.201412319
日期:2015.5.18
N‐heterocyclic carbene ligands enable direct arene alkenylations with easily accessible alkenyl acetates through regioselective CH/CO functionalizations in a stereoconvergent fashion. The versatile cobalt catalyst was broadly applicable and thus also allowed for the efficient conversion of alkenyl phosphates, carbonates, and carbamates at ambient temperature.
便宜的钴催化剂与N-杂环碳烯配体能够通过区域选择性下用容易获得的烯基乙酸酯直接芳烃alkenylations H / C Ò官能化以stereoconvergent方式。通用的钴催化剂具有广泛的用途,因此也可以在环境温度下有效地转化烯基磷酸盐,碳酸盐和氨基甲酸酯。