Polycyclic compounds, their preparation and their use as phosphodiesterases inhibitors
申请人:TSUMURA & CO.
公开号:EP0594890A1
公开(公告)日:1994-05-04
Polycyclic compounds (I) can be prepared in accordance with the following reaction formula:
wherein R₁-R₈ each represents a hydrogen atom, a hydroxyl group, an alkoxyl group or a substituted or unsubstituted benzyloxy group or neighboring two groups of R₁-R₈ are coupled together to form an alkylenedioxy group; and A is an alkylene group which may be substituted by one or more alkoxycarbonyl groups, an alkenylene group which may be substituted by one or more alkoxycarbonyl groups, or a group represented by any one of the following formulas:
An economical and environmentally friendly oxidative biaryl coupling promoted by activated MnO<sub>2</sub>
作者:Jingjing Yang、Shutao Sun、Ziyu Zeng、Hongbo Zheng、Wei Li、Hongxiang Lou、Lei Liu
DOI:10.1039/c4ob01409j
日期:——
An activated manganese dioxide (MnO2)–BF3·OEt2 oxidation system was developed to efficiently mediate the intramolecular as well as intermolecular biaryl coupling. The oxidative coupling proceeds smoothly at ambient temperature to deliver the corresponding five- to eight-membered tricyclic products in good to excellent yields. The employment of the combination of MnO2 and BF3·OEt2 is attractive on the basis of economical and environmental issues.
Process for the preparation of polycyclic compounds
申请人:TSUMURA & CO.
公开号:EP0511666A1
公开(公告)日:1992-11-04
Polycyclic compounds (I) can be prepared in accordance with the following reaction formula:
wherein R₁-R₈ each represents a hydrogen atom, a hydroxyl group, an alkoxyl group or a substituted or unsubstituted benzyloxy group or neighboring two groups of R₁-R₈ are coupled together to form an alkylenedioxy group; and A is an alkylene group which may be substituted by one or more alkoxycarbonyl groups, an alkenylene group which may be substituted by one or more alkoxycarbonyl groups, or a group represented by any one of the following formulas:
Process for the preparation of polycyclic compounds using ferric
申请人:Tsumura & Co.
公开号:US05321135A1
公开(公告)日:1994-06-14
Polycyclic compounds (I) can be prepared in accordance with the following reaction formula: ##STR1## wherein R.sub.1 -R.sub.8 each represents a hydrogen atom, a hydroxyl group, an alkoxyl group or a substituted or unsubstituted benzyloxy group or neighboring two groups of R.sub.1 -R.sub.8 are coupled together to form an alkylenedioxy group; and A is an alkylene group which may be substituted by one or more alkoxycarbonyl groups, an alkenylene group which may be substituted by one or more alkoxycarbonyl groups, or a group represented by any one of the following formulas: ##STR2##