Iodine induced transformations of alcohols under solvent-free conditions
摘要:
Iodine has been shown to be an efficient catalyst for transformations of alcohols under solvent-free conditions. In the presence of 5% of iodine, tertiary alcohols underwent dehydration forming the corresponding alkenes, while in the case of 2-phenylpropane-2-ol cyclodimerisation to 1,1,3-trimethyl-3-phenylindane took place. Secondary and primary benzyl alcohols under the same conditions gave the corresponding ethers. (c) 2006 Elsevier Ltd. All rights reserved.
Et<sub>2</sub>Zn-Mediated Rearrangement of Bromohydrins
作者:Lezhen Li、Peijie Cai、Qingxiang Guo、Song Xue
DOI:10.1021/jo800231s
日期:2008.5.1
and highly efficient method for the rearrangement of bromohydrins mediated by Et2Zn to synthesize carbonylcompounds was described. Various β-bromo alcohols were treated with 0.6 equiv of Et2Zn to form a zinc complex in CH2Cl2 at room temperature for 2 h, followed by 1,2-migration to give the corresponding carbonylcompounds. This remarkable and clean rearrangement is general for acyclic and cyclic bromohydrins
Conversion of Carbonyl Compounds to Olefins
<i>via</i>
Enolate Intermediate
作者:Zhi‐Chao Cao、Pei‐Lin Xu、Qin‐Yu Luo、Xiao‐Lei Li、Da‐Gang Yu、Huayi Fang、Zhang‐Jie Shi
DOI:10.1002/cjoc.201800554
日期:2019.8
A general and efficient protocol to synthesize substituted olefins from carbonyl compounds via nickel catalyzed C—O activation of enolates was developed. Besides ketones, aldehydes were also suitable substrates for the presented catalytic system to produce di‐ or tri‐ substituted olefins. It is worth noting that this approach exhibited good tolerance to highly reactive tertiary alcohols, which could
Stereochemistry and Some Kinetic Aspects of Fluorination of Phenyl-Substituted Alkenes with Selectfluor<sup>TM</sup>Reagent F-TEDA-BF<sub>4</sub>
作者:Stojan Stavber、Tjaša Sotler-Pecan、Marko Zupan
DOI:10.1246/bcsj.69.169
日期:1996.1
while equal amounts of both diastereoisomers were formed in the case of (E)-1-phenyl-1-propene and acenaphthylene. In the phenyl-substituted benzocyclene series the stereochemistry of fluoro-alkoxylation was found to be dependent on ring size and on the structure of the alcohol. The resulting vicinal fluoroalkoxy adducts were transformed by heating in aqueous HBr to 2-fluoro-1-phenylbenzocyclenes. Correlation
One-Pot Synthesis of Spirofuran and Benzocycloalka[1,2-<i>b</i>]furan Derivatives Using Manganese(III)-Mediated Oxidative Radical Cyclization
作者:Hiroshi Nishino、Reika Fujino
DOI:10.1055/s-2005-861807
日期:——
obtained by the oxidation of methylenebenzocycloalkanes with manganese(III) acetate in the presence of 1,3-dicarbonyl compounds. A similar oxidation of the benzocycloalkene derivatives produced the functionalized benzocycloalka[1,2-b]furans in good yields. However, l-benzyl-3,4-dihydronaphthalene gave both the corresponding spirofuran and benzocyclohexa[1,2-b]furan under the same oxidation conditions.
Photolysis of 1,2-benzo-1,3-cycloalkadien-4-yl bromides and 1,2-benzo-,1,3-cycloalkadien-3-yl chlorides showed a remarkable effect of ring size on the rearrangements of the resulting 1,2-benzo-1,3-cycloalkadienyl cations, i.e., 1,2-aryl or alkyl migration across the double bond and 1,2-hydride or methyl migration to the cationic center.