Manganese-Catalyzed Oxidative Azidation of Cyclobutanols: Regiospecific Synthesis of Alkyl Azides by CC Bond Cleavage
作者:Rongguo Ren、Huijun Zhao、Leitao Huan、Chen Zhu
DOI:10.1002/anie.201506578
日期:2015.10.19
azidation of cyclobutanols is described. A wide range of primary, secondary, and tertiary alkyl azides were generated in synthetically useful yields and exclusive regioselectivity. Aside from linear alkyl azides, otherwise elusive medium‐sized cyclicazides were also readily prepared. Preliminary mechanistic studies reveal that the reaction likely proceeds by a radical‐mediated CC bond cleavage/CN3 bond
描述了一种新型的锰催化的环丁醇的氧化叠氮化。产生了大量伯,仲和叔烷基叠氮化物,具有合成上有用的产率和唯一的区域选择性。除了线性烷基叠氮化物外,还容易制备难以捉摸的中型环状叠氮化物。初步机理研究表明,该反应可能是由自由基介导的C转入 C键裂解/ C Ñ 3键的形成通路。
Cycloadditions of dichloroketene to olefins and dienes
situ by dehydrohalogenation of dichloroacetyl chloride with triethylamine or zinc dehalogenation of trichloroacetyl bromide, is a reactive and unstable molecule. It reacts very readily with conjugated dienes to give exclusively derivatives of α,α dichlorocyclobutanone. No 1,4-cycloadducts were detected. Other activated olefins such as indene or dihydropyran also give good yields of cycloadducts. Electrophilic
Metal-catalysed enantiospecific aerobic oxidation of cyclobutanones
作者:Carsten Bolm、Gunther Schlingloff
DOI:10.1039/c39950001247
日期:——
The metal-catalysed aerobic oxidation of substituted racemic cyclobutanones provides optically active lactones with enantioselectivities of up to 95% e.e.
Microbial Baeyer−Villiger Oxidation: Stereopreference and Substrate Acceptance of Cyclohexanone Monooxygenase Mutants Prepared by Directed Evolution
作者:Marko D. Mihovilovic、Florian Rudroff、Alexander Winninger、Toni Schneider、Frank Schulz、Manfred T. Reetz
DOI:10.1021/ol0601040
日期:2006.3.1
array of random mutants of cyclohexanonemonooxygenase (CHMO) from Acinetobacter sp. NCIMB 9871 was screened against a library of structurally diverse ketones for modifications in the substrate acceptance profile and stereopreference of the enzymatic Baeyer-Villiger biooxidation. While the set of mutant biocatalysts was initially evolved for the enantiocomplementary oxidation of 4-hydroxycyclohexanone