Aryl participated cyclisations involving indane derivatives a total synthesis of (±)-isolongifolene
摘要:
A total synthesis of (+/-)-isolongifolene (1) has been accomplished using intramolecular anionic cyclisation of the bromophenol 2 as the key step. Aryl participated intramolecular cyclisation of the diazomethyl ketones 17 and 23 provided the dienediones 18 and 24 which were stereo-selectively converted into the diketones 19 and 25 respectively.
Formation of 2,2-dimethylchroman-4-ones during the photoinduced rearrangement of some aryl 3-methyl-2-butenoate esters. A mechanistic insight
作者:Daniela Iguchi、Rosa Erra-Balsells、Sergio M. Bonesi
DOI:10.1016/j.tet.2016.02.039
日期:2016.4
Several aryl 3-methyl-2-butenoate esters upon irradiation lead to the formation of [1,3]-migrated photoproducts, phenol and, surprisingly 2,2-dimethylchroman-4-one derivatives. The starting photochemical reaction takes place from the singlet excited state of the ester and as a total mechanism two consecutive reaction pathways are proposed. The former involves the photo-Fries rearrangement of the esters
Bismuth(III) triflate catalyzed tandem esterification–Fries–oxa-Michael route to 4-chromanones
作者:Kevin Meraz、Krishna Kumar Gnanasekaran、Rup Thing、Richard A. Bunce
DOI:10.1016/j.tetlet.2016.10.005
日期:2016.11
An efficient tandem reaction approach is described to prepare 4-chromanones from electron-rich phenols and 3,3-dimethylacrylic acid or trans-crotonic acid in boiling toluene using 20 mol % bismuth(III) triflate as the catalyst. The reaction is also successful from the corresponding aryl esters of each of these acids under the same conditions. The procedure is convenient to perform, and 25–90% yields
A systematic study of the reaction of a series of monosubstituted phenols 3 and 3-methylbut-2-enoic acid 4 in phosphorusoxychloride/zinc chloride revealed that the formation of 4-chromanones was strongly infuenced by the substituents and their position on the aromatic ring of the starting phenols.
Investigation of the Rh-Catalyzed Asymmetric Reductive Aldol Reaction. Expanded Scope Based on Reaction Analysis
作者:Albert E. Russell、Nathan O. Fuller、Steven J. Taylor、Pauline Aurriset、James P. Morken
DOI:10.1021/ol049591e
日期:2004.7.1
[reaction: see text] A series of experiments are described that suggest that the Rh-catalyzed reductive aldol reaction proceeds by addition of a Rh(I) hydride, generated in situ, to the reacting acrylate followed by a stereochemistry-controlling aldol addition reaction. On the basis of this hypothesis, reaction conditions are engineered that allow for increased substrate scope.
CHROMAN-SUBSTITUTED, TETRAHYDROQUINOLINE-SUBSTITUTED AND THIOCHROMAN-SUBSTITUTED HETEROAROTINOIDS AS ANTI-CANCER AGENTS
申请人:THE BOARD OF REGENTS FOR OKLAHOMA STATE UNIVERSITY
公开号:US20200062711A1
公开(公告)日:2020-02-27
Chemical compounds that inhibit cancer cell growth are provided. The compounds are heteroarotinoids and derivatives thereof with oxygen, nitrogen or sulfur in chroman systems, tetrahydroquinoline systems, and tetrahydrothiochroman systems.