3-Formylchromone reacts with cyclohexyl isocyanide to produce pyrano[3,4-b]chromone, which rearranges to 1-benzopyrano[2,3-c]pyridine when heated with HCl in ethanol.
Synthesis of functionalized chromones via organocatalysis
作者:Sai-Shuai Wen、Jing Wang、Yi-Ming Luo、Hua Yang
DOI:10.1016/j.tet.2014.10.045
日期:2014.12
A facile and versatile organocatalytic approach to access 2-substituted and 2,3-disubstituted chromone derivatives under mild conditions was developed, which was effectively catalyzed by novel proline phenylsulphonylhydrazide or pyrrolidine. As a result, diversely functionalized chromones were obtained in up to 99% yield. In addition, further modification of the corresponding chromones afforded novel polycyclic chromones. (C) 2014 Elsevier Ltd. All rights reserved.
US4769367A
申请人:——
公开号:US4769367A
公开(公告)日:1988-09-06
The Synthesis of a Clavacin Isomer and Related Compounds<sup>1</sup>
作者:Bruno Puetzer、Cyril H. Nield、Richard H. Barry
DOI:10.1021/ja01221a041
日期:1945.5
Heterocyclic amino compounds
申请人:Glaxo Group Limited
公开号:US04769367A1
公开(公告)日:1988-09-06
Compounds of the general formula (I) ##STR1## (wherein R is H, alkyl, alkenyl, alkynyl, cycloalkyl, aralkyl or CHO; and R.sup.1 and R.sup.2 each represents H, fluorine or chlorine); and their salts have selective .alpha..sub.2 -adrenoreceptor antagonist action. The compounds may be prepared by amination of compounds of the general formula (II): ##STR2## (wherein X is a leaving group).