4-(<i>N,N</i>-Dimethylamino)pyridine Hydrochloride as a Recyclable Catalyst for Acylation of Inert Alcohols: Substrate Scope and Reaction Mechanism
作者:Zhihui Liu、Qiaoqiao Ma、Yuxiu Liu、Qingmin Wang
DOI:10.1021/ol4030875
日期:2014.1.3
4-(N,N-Dimethylamino)pyridine hydrochloride (DMAP·HCl), a DMAP salt with the simplest structure, was used as a recyclablecatalyst for the acylation of inert alcohols and phenols under base-free conditions. The reaction mechanism was investigated in detail for the first time; DMAP·HCl and the acylating reagent directly formed N-acyl-4-(N′,N′-dimethylamino)pyridine chloride, which was attacked by the
Introduction of a functionalized carbon chain at the 3-position of 4-methoxy-2-quinolones via photochemical 2+2 cycloaddition to alkynes and the synthesis of (.+-.)-edulinine.
作者:Toshihiko Naito、Chikara Kaneko
DOI:10.1248/cpb.31.366
日期:——
Irradiation of 4-methoxy-2-quinolone or its derivatives in methanol in the presence of mono-substituted ethyne gave the head-to-tail adducts : 1-substituted 2a, 8b-dihydrocyclobuta [c] quinolin-3 (4H)-one derivatives. A method for fissioning the C1-C8b bond in the adducts was developed. Based on these findings, the cycloadduct obtained from 4-methoxy-1-methyl-2-quinolone and 2-methyl-3-butyn-2-ol was transformed to (±)-edulinine.
Cyclobutane Ring Opening Reactions of 1,2,2a,8b-Tetrahydrocyclobuta[<i>c</i>]-quinolin-3(4<i>H</i>)-ones
作者:Thorsten Bach、Philipp Selig
DOI:10.1055/s-2008-1067143
日期:2008.7
bond in the title compounds. The first reaction was found by serendipity when reductive debenzylation was attempted on a heteroanellated azabicyclo[4.2.0]octane. It yielded an eight-membered lactam ring (azocane). The second transformation relies on a rationally designed 1,2-rearrangement reaction, which was introduced because attempts to induce classical Wagner-Meerwein-type 1,2-shifts did not meet
THE PHOTO-REARRANGEMENT OF HYPOIODITES GENERATED FROM CYCLOBUTANOLS FORMED BY MEANS OF 2+2 PHOTOCYCLOADDITION BETWEEN 4-HYDROXY-2-QUINOLO AND CYCLOALKENE OR ALKENE TO 2,3-FURANOQUINOL-4-ONES
The irradiation of hypoiodites generated from cyclobutanols prepared by means of N-methylation and hydrolysis of 2+2 photocycloadducts between 4-acetoxy-2-quinolone and cyclopentene or 2,3-dimethylbut-2-ene induced rearrangements of the corresponding alkoxy radicals to give 2,3-furanoquinol-4-ones or a ring expanded product.