申请人:SK Corporation
公开号:EP1632485A1
公开(公告)日:2006-03-08
Disclosed is a process of producing 3,4,5,7,8,9-hexahydro-2H-dibenzofuran-1-one, and 1-hydroxydibenzofuran and 4-hydroxycarbazole using 3,4,5,7,8,9-hexahydro-2H-dibenzofuran-1-one as an intermediate. 2-chlorocyclohexanone and 1,3-cyclohexanedione are reacted with each other in a base and organic solvent to form a carbon-carbon bond, and then subject to a cyclization reaction in the presence of an acid solution to produce 3,4,5,7,8,9-hexahydro-2H-dibenzofuran-1-one. 3,4,5,7,8,9-hexahydro-2H-dibenzofuran-1-one as the intermediate is subjected to nitrogen substitution and dehydrogenation reactions to produce 4-hydroxycarbazole. 1-hydroxydibenzofuran is produced by dehydrogenating 3,4,5,7,8,9-hexahydro-2H-dibenzofuran-1-one. The process according to the present invention is advantageous in that a low-priced starting material is used to improve economic efficiency, the reaction is stable in specific base and organic solvent conditions, and 3,4,5,7,8,9-hexahydro-2H-dibenzofuran-1-one is produced at high yield because of the cyclization reaction in the presence of the acid solution. Furthermore, 1-hydroxydibenzofuran and 4-hydroxycarbazole can be stably and economically produced using the above intermediate.
本发明公开了一种利用3,4,5,7,8,9-六氢-2H-二苯并呋喃-1-酮作为中间体生产3,4,5,7,8,9-六氢-2H-二苯并呋喃-1-酮、1-羟基二苯并呋喃和4-羟基咔唑的方法。将2-氯环己酮和1,3-环己二酮在碱和有机溶剂中相互反应形成碳-碳键,然后在酸溶液存在下进行环化反应以产生3,4,5,7,8,9-六氢-2H-二苯并呋喃-1-酮。将3,4,5,7,8,9-六氢-2H-二苯并呋喃-1-酮作为中间体进行氮取代和脱氢反应以产生4-羟基咔唑。通过脱氢3,4,5,7,8,9-六氢-2H-二苯并呋喃-1-酮来生产1-羟基二苯并呋喃。根据本发明的方法具有以下优点:使用低价起始原料提高经济效益,反应在特定碱和有机溶剂条件下稳定,由于在酸溶液存在下的环化反应,3,4,5,7,8,9-六氢-2H-二苯并呋喃-1-酮的产量较高。此外,可以使用上述中间体稳定、经济地生产1-羟基二苯并呋喃和4-羟基咔唑。