Cycloadditions in syntheses. VIII. Synthesis of 1,2-dihydrocyclobuta(c)-pyridine and -quinoline and their 3-substituted derivatives.
作者:CHIKARA KANEKO、TOSHIHIKO NAITO、YU MOMOSE、HARUE FUJII、NAYOMI NAKAYAMA、IKUE KOIZUMI
DOI:10.1248/cpb.30.519
日期:——
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。