Synthesis of novel quinoxalines by ring transformation of 3-quinoxalinyl-l,5-benzodiazepine
作者:Yoshihisa Kurasawa、Sayuri Shimabukuro、Yoshihisa Okamoto、Atsushi Takada
DOI:10.1002/jhet.5570220567
日期:1985.9
Ring transformation of the 3-quinoxalinyl-l,5-benzodiazepine (2) gave 3-(benzimidazol-2-ylmethylene)-2-oxo-l,2,3,4-tetrahydroquinoxaline hydrochloride (4a), whose treatment with 5% sodium hydroxide provided the free base 5a, while refluxing of the 3′-chloro-l-formyl derivative 3 in acetic acid and in 10% hydrochloric acid/acetic acid afforded 3-(3-oxo-3,4-dihydroquinoxalin-2-yl)-1,2-dihydro-1-formyl-2-oxo-3H-1
3-喹喔啉基-1,5-苯并二氮杂卓(2)的环转化得到3-(苯并咪唑-2-基亚甲基)-2-氧代-1,2,3,4-四氢喹喔啉盐酸盐(4a),用5%处理用氢氧化钠提供游离碱5a,同时使3'-氯-1-甲酰基衍生物3在乙酸和10%盐酸/乙酸中回流,得到3-(3-氧代-3,4-二氢喹喔啉-2- yl)-1,2-二氢-1-甲酰基-2-氧代-3H-1,5-苯二氮卓盐酸盐(7)和3-甲基-2-氧代-1,2-二氢喹喔啉(6)。将化合物4a和5a转化为3-(α-羟基亚氨基苯并咪唑-2-基甲基)-2-氧代-1,2-二氢喹喔啉(8)和3-(苯并咪唑-2-基羰基)-2-氧代-1,2-二氢喹喔啉(10),分别进一步转化成3-(苯并咪唑-2-基)异唑并[4,5- b ]喹喔啉(9)和12-(苯并咪唑-2-基)-6H-喹喔啉[2,3- b I 1,5]苯并二氮杂((11)。