6,7, dialkoxy-3,4-dihydroisoquinolin-8-ol, process for preparation thereof and process for preparation of 6,7-dialkoxy-1,2,3,4-tetrahydroisoquinolin-8-ol using the compound
申请人:BANYU PHARMACEUTICAL CO., LTD.
公开号:EP0617022A1
公开(公告)日:1994-09-28
This invention relates to novel 6, 7 - dialkoxy - 3, 4 - dihydroisoquinolin - 8 - ols, a process for preparing the 6, 7 - dialkoxy - 3, 4 - dihydroisoquinolin - 8 - ols reioselectively and in a high yield utilizing the Bischler - Napieralski reaction, a process for synthesizing 6, 7 - dialkoxy - 1, 2, 3, 4 - tetrahydroisoquinolin - 8 - ols via the compounds, and use of the 6, 7 - dialkoxy - 3, 4 - dihydroisoquinolin - 8 - ols for preparation of the 6, 7 - dialkoxy - 1, 2, 3, 4 - tetrahydroisoquinolin - 8 - ols..
It is possible, according to this invention, to obtain the 6, 7 - dialkoxy - 1, 2, 3, 4 - tetrahydroisoquinolin - 8 - ols, which have hitherto been difficult to synthesize, via the 6, 7 - dialkoxy - 3, 4 - dihydroisoquinolin - 8 - ols in a high yield.
本发明涉及新型 6, 7 - 二烷氧基 - 3, 4 - 二氢异喹啉 - 8 - 邻苯二甲酸酯,一种利用 Bischler - Napieralski 反应再选择性和高产率制备 6, 7 - 二烷氧基 - 3, 4 - 二氢异喹啉 - 8 - 邻苯二甲酸酯的工艺、通过这些化合物合成 6,7-二烷氧基-1,2,3,4-四氢异喹啉-8-烯丙基醚的工艺,以及利用 6,7-二烷氧基-3,4-二氢异喹啉-8-烯丙基醚制备 6,7-二烷氧基-1,2,3,4-四氢异喹啉-8-烯丙基醚。.
根据本发明,可以通过 6, 7 - dialkoxy - 3, 4 - dihydroisoquinolin - 8 - ols 以高收率获得迄今为止难以合成的 6, 7 - dialkoxy - 1, 2, 3, 4 - tetrahydroisoquinolin - 8 - ols。