Cannizzaro reaction of 2-chloro-3-formylquinolines and its synthetic utility for 2-acetylfuro[2,3-b]quinolines: The alkaloid analogues
作者:DEVADOSS KARTHIK KUMAR、RAJAKANDHAN SHANKAR、SUBRAMANIAM PARAMESWARAN RAJENDRAN
DOI:10.1007/s12039-012-0297-2
日期:2012.9
Cannizzaro reaction of 2-chloro-3-formylquinolines was investigated under two different conditions. Under both conditions, redox and methoxylation proceeded simultaneously and gave 2-methoxy-3-formylquinolines, 2-methoxyquinolin-3-yl-methanols and 2-methoxyquinoline-3-carboxylic acids. The synthesized 2-methoxy-3-formylquinolines were then condensed with acetone in the presence of sulphuric acid to give 4-(2-methoxy-quinolin-3-yl)-but-3-en-2-ones which in turn were bromocyclized and dehydrobrominated to get 2-acetylfuro[2,3-b]quinolines.
在两种不同条件下研究了 2-氯-3-甲酰基喹啉的 Cannizzaro 反应。在这两种条件下,氧化还原和甲氧基化反应同时进行,生成了 2-甲氧基-3-甲酰基喹啉、2-甲氧基喹啉-3-基甲醇和 2-甲氧基喹啉-3-羧酸。合成的 2-甲氧基-3-甲酰基喹啉随后在硫酸存在下与丙酮缩合,得到 4-(2-甲氧基-喹啉-3-基)-丁-3-烯-2-酮,再将其溴化和脱氢溴化,得到 2-乙酰基呋喃并[2,3-b]喹啉。