5-羟基-3,4-二氢异喹啉-1-酮的合成

Synthesis of 3,4-Dihydro-5-hydroxy-1(2H)-isoquinolinone

以异喹啉为起始原料,经成盐、磺化得异喹啉-5-磺酸(3),3与熔融的氢氧化钠和氢氧化钾反应得1,5-二羟基异喹啉(4),以5%Pd-C为催化剂还原4得5-羟基-3,4-二氢异喹啉-1-酮(1),总收率47.6%。1的结构经1H NMR和MS确证。

3,4-Dihydro-5-hydroxy-1 （2H） -isoquinolinone （ 1 ） was synthesized from isoquinoline （2） by a three-step reaction that isoquinoline-5-sulfonic acid（3） was prepared by the reaction of fuming sulfuric acid with 2, 1 ,5-dihydroxy-isoquinoline（4） was obtained from 3 in a melted mixture of sodium hydroxide and potassium hydroxide and hydrogenation of 4 to 1 was fulfilled in the presence of 5 % Pd-C. The overall yield of 1 was 47.6%. The structure of 1 was identified by ^1 H NMR and MS.