1, 2-Dihydrocyclobuta [c] quinolin-3(4H)-one was synthesized from 4-methoxyquinolin-2(1H)-one according to our two-step procedure involving photoaddition of the latter to ethylene and subsequent elimination of methanol from the adduct. Chlorination of this compound with phosphoryl chloride afforded 3-chloro-1, 2-dihydrocyclobuta [c] quinoline. This 3-chloro derivative then afforded either the parent base (1, 2-dihydrocyclobuta [c]-quinoline) by reductive dechlorination, or a variety of 3-substituted derivatives by reaction with nucleophiles. In a similar manner, the corresponding 1, 2-dihydrocyclobuta [c] pyridine and its 3-substituted derivatives were synthesized from 1, 2-dihydrocyclobuta [c] pyridin-3(4H)-one obtained from 4-methoxy- or -acetoxy-pyridin-2(1H)-one and ethylene. Suitable reaction conditions for nucleophilic substitution reactions of the 3-chlorofunction were determined for each 1, 2-dihydrocyclobuta [c]-quinoline or -pyridine derivative.
1, 2-二氢
环丁基[c]
喹啉-3(4H)-酮是由
4-甲氧基喹啉-2(1H)-酮根据我们的两步程序合成的,包括将后者光加成到
乙烯上并随后从产物中消除
甲醇加合物。该化合物用
磷酰
氯氯化,得到3-
氯-1,2-二氢
环丁基[c]
喹啉。然后,该3-
氯衍
生物通过还原脱
氯得到母体碱(1, 2-二氢环丁[c]-
喹啉),或通过与亲核试剂反应得到各种3-取代衍
生物。以类似的方式,由4-甲氧基-或-乙酰氧基得到的1, 2-二氢环丁[c]
吡啶-3(4H)-酮合成相应的1, 2-二氢环丁[c]
吡啶及其3-取代衍
生物。 -
吡啶-2(1H)-酮和
乙烯。对于每种1, 2-二氢环丁[c]-
喹啉或-
吡啶衍生物,确定了3-
氯官能团的亲核取代反应的合适反应条件。