Reaction of beta-bromo alpha-alkylthiocinnamonitriles with various substituted methyl salicylates followed by treatment with AlCl3/PhNO2 provides 3-cyanoflavones. (C) 2003 Elsevier Ltd. All rights reserved.
Construction of trisubstituted chromone skeletons carrying electron-withdrawing groups via PhIO-mediated dehydrogenation and its application to the synthesis of frutinone A
作者:Qiao Li、Chen Zhuang、Donghua Wang、Wei Zhang、Rongxuan Jia、Fengxia Sun、Yilin Zhang、Yunfei Du
DOI:10.3762/bjoc.15.291
日期:——
The construction of the biologically interesting chromone skeleton was realized by PhIO-mediated dehydrogenation of chromanones under mild conditions. Interestingly, this method also found application in the synthesis of the naturally occurring frutinone A.
Novel conversion of 3-(α-hydroxybenzyl)flavones to 3-benzoylchromones and 3-cyanoflavones with NaN3/TFA
作者:Asok K Mallik、Falguni Chattopadhyay、Sankar P Dey
DOI:10.1016/s0040-4039(00)00730-9
日期:2000.6
On treatment with NaN3/TFA, 3-(α-hydroxybenzyl)flavones are converted to 3-benzoyl- chromones and 3-cyanoflavones, plausible mechanisms for which have been suggested.
Facile Synthesis of Tetrazolylchromonoids and Related Compounds
作者:Tamás Patonay、Albert Lévai
DOI:10.1002/ardp.19943270310
日期:——
The reaction between the appropriate nitriles and tributyltin azide (TBTA) provides an easy and efficient method for the synthesis of the title compounds. Treatment of thiocyanate 9b with TBTA affords the alkylthio‐substituted tetrazole 10b.
A novel combination of SmI2, KHMDS, and TsCN can be utilized to introduce a cyano group into structurally diverse and highly sensitive 2-alkyl-chroman-4-ones. Subsequent oxidation allows the formed 2-alkyl-3-cyanochromones to be isolated in yields ranging from 49 to 77%. In addition, alpha-bromoketones and esters were found to undergo equally effective alpha-cyanation.