Cobalt-catalyzed cyclization with the introduction of cyano, acyl and aminoalkyl groups
作者:Hiroto Hori、Shigeru Arai、Atsushi Nishida
DOI:10.1039/c9ob00637k
日期:——
An efficient synthesis of carbo- and heterocycles using CC, CO and CN bonds undercobaltcatalysis is described. The substituents on olefins are key for controlling the regio- and chemoselectivity in the initial hydrogen atom transfer step and quaternary carbons are efficiently constructed under mild conditions. Cyclopropane cleavage and tandem cyclization give highly functionalized bicyclic skeletons
Formamides as Lewis Base Catalysts in S<sub>N</sub>Reactions-Efficient Transformation of Alcohols into Chlorides, Amines, and Ethers
作者:Peter H. Huy、Sebastian Motsch、Sarah M. Kappler
DOI:10.1002/anie.201604921
日期:2016.8.16
and waste‐balance (E‐factor down to 2). Chiral substrates are converted with excellent levels of stereochemical inversion (99 %→≥95 % ee). In a practical one‐pot procedure, the primary formed chlorides can be further transformed into amines, azides, ethers, sulfides, and nitriles. The value of the method was demonstrated in straightforward syntheses of the drugs rac‐Clopidogrel and S‐Fendiline.
[EN] METHOD OF CONVERTING ALCOHOL TO HALIDE<br/>[FR] PROCÉDÉ DE CONVERSION D'UN ALCOOL EN HALOGÉNURE
申请人:UNIV SAARLAND
公开号:WO2016202894A1
公开(公告)日:2016-12-22
The present invention relates to a method of converting an alcohol into a corresponding halide. This method comprises reacting the alcohol with an optionally substituted aromatic carboxylic acid halide in presence of an N-substituted formamide to replace a hydroxyl group of the alcohol by a halogen atom. The present invention also relates to a method of converting an alcohol into a corresponding substitution product. The second method comprises: (a) performing the method of the invention of converting an alcohol into the corresponding halide; and (b) reacting the corresponding halide with a nucleophile to convert the halide into the nucleophilic substitution product.
Die Solvoyse von 4-substituierten 2-Chlor-2-methylbutanen
作者:Cyril A. Grob、Adrian Waldner
DOI:10.1002/hlca.19790620614
日期:1979.9.19
The solvolysis of sixteen 4-substituted 2-chloro-2-methylbutanes in aqueous dioxane has been studied.
已经研究了十六种4-取代的2-氯-2-甲基丁烷在二恶烷水溶液中的溶剂化作用。
Small-Ring Compounds. XXXIV. Carbonium Ion Reactions of 1-Methylcyclobutyl, (1-Methylcyclopropyl)-carbinyl and (β-Methylallyl)-carbinyl Derivatives<sup>1</sup>
作者:Eugene F. Cox、Marjorie C. Caserio、Marc S. Silver、John D. Roberts
DOI:10.1021/ja01473a028
日期:1961.6
alcohol as the only cyclic product. About 3% of the ^(14)C content of 1-methylcyclobutanol from the deamination of (1-methylcyclopropyl)-carbynil-α-^(14)C)-amine was found at the 3-position. These results are interpretable in terms of classical carboniumions and/or substituted “bicyclobutonium” ion intermediates with fairly localized positive charges.