作者:Hiroshi Yoshida、Hideki Ohtsuka、Keisuke Yoshida、Yoshiyuki Totani、Tsuyoshi Ogata、Kiyoshi Matsumoto
DOI:10.1246/bcsj.61.4347
日期:1988.12
2,3-Diphenyl-, 2-methyl-3-phenyl-, and 2-methyl-3-(4-methylphenyl)cyclopropenone oxime hydrochlorides (3) were prepared in good yields from the corresponding cyclopropenones and hydroxylamine hydrochloride in methanol. The salts 3 reacted with alkyl and aryl isocyanates in the presence of triethylamine to afford 1:2 addition products 4,6-diazaspiro[2.3]hexenones in moderate yields. In contrast, acetone
2,3-二苯基-、2-甲基-3-苯基-和2-甲基-3-(4-甲基苯基)环丙烯酮肟盐酸盐(3)在甲醇中由相应的环丙烯酮和羟胺盐酸盐以良好的产率制备。在三乙胺的存在下,盐 3 与烷基和芳基异氰酸酯反应,以中等产率得到 1:2 加成产物 4,6-二氮杂螺[2.3] 己烯酮。相比之下,丙酮、苯乙酮和环己酮肟与两倍过量的异氰酸甲酯反应生成线性 1:2 加成产物,而二苯甲酮肟仅生成 1:1 加成产物。