Reactivity increase of dienophiles by change of the ester substituents into the acid chlorides: cycloaddition reaction of the diacid chloride of 3,10-hexacyclo[10.2.1.15,8.02,11.03,10.04,9]hexadeca-6,13-diene-3,10-dicarboxylic acid with quadricyclane
摘要:
Conversion of the ester substituents on the cyclobutene it-bond of dimethyl tricyclo[4.2.1.0(2,5)]nona-3,7-diene-3,4-dicarboxylate to the corresponding acid chloride increases the cycloaddition reactivity toward quadricyclane so dramatically that the reaction temperature can be dropped from 180 degrees C (preparation of title 3,10-diester) to room temperature (preparation of the title 3,10-diacid chloride). The cycloadduct product, an acid chloride of the title ring system, is extremely docile and can be recrystallized unchanged from hot methanol. (C) 2013 Elsevier Ltd. All rights reserved.
Reactivity increase of dienophiles by change of the ester substituents into the acid chlorides: cycloaddition reaction of the diacid chloride of 3,10-hexacyclo[10.2.1.15,8.02,11.03,10.04,9]hexadeca-6,13-diene-3,10-dicarboxylic acid with quadricyclane
摘要:
Conversion of the ester substituents on the cyclobutene it-bond of dimethyl tricyclo[4.2.1.0(2,5)]nona-3,7-diene-3,4-dicarboxylate to the corresponding acid chloride increases the cycloaddition reactivity toward quadricyclane so dramatically that the reaction temperature can be dropped from 180 degrees C (preparation of title 3,10-diester) to room temperature (preparation of the title 3,10-diacid chloride). The cycloadduct product, an acid chloride of the title ring system, is extremely docile and can be recrystallized unchanged from hot methanol. (C) 2013 Elsevier Ltd. All rights reserved.
Container Systems II: An Experimental Study of the High-Pressure Intramolecular Cycloaddition of Tethered Furans and Anthracenes onto Norbornane Cyclobutene-1,2-diesters
作者:Davor Margetić、Ronald N. Warrener
DOI:10.1002/jhet.2015
日期:2014.9
single 1:1‐adduct was obtained in which one furfuryl moiety was intramolecularly cyclized and the other present as the DMAD adduct; again this product underwent retro‐DA reaction at 40°C. Similar intermolecular cyclization was observed with the bis‐anthracenyl esters. The stereoselectivity of the intermolecular attack of the furfuryl diene with the dienophilic cyclobutene gave a single adduct by endo‐face
Reactivity increase of dienophiles by change of the ester substituents into the acid chlorides: cycloaddition reaction of the diacid chloride of 3,10-hexacyclo[10.2.1.15,8.02,11.03,10.04,9]hexadeca-6,13-diene-3,10-dicarboxylic acid with quadricyclane
作者:Davor Margetić、Anamarija Briš、Ronald N. Warrener、Douglas N. Butler
DOI:10.1016/j.tet.2013.06.057
日期:2013.9
Conversion of the ester substituents on the cyclobutene it-bond of dimethyl tricyclo[4.2.1.0(2,5)]nona-3,7-diene-3,4-dicarboxylate to the corresponding acid chloride increases the cycloaddition reactivity toward quadricyclane so dramatically that the reaction temperature can be dropped from 180 degrees C (preparation of title 3,10-diester) to room temperature (preparation of the title 3,10-diacid chloride). The cycloadduct product, an acid chloride of the title ring system, is extremely docile and can be recrystallized unchanged from hot methanol. (C) 2013 Elsevier Ltd. All rights reserved.