会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 6. 发明专利
    • NOVEL PREPARATION OF PHTHALIMIDINE DERIVATIVE
    • JPS5841865A
    • 1983-03-11
    • JP14201681
    • 1981-09-07
    • HISAMITSU PHARMACEUTICAL CO
    • NODA KANJINAKAGAWA AKIRAMOTOMURA TOSHIHARU
    • C07D209/46
    • PURPOSE:To obtain the titled compound useful as an intermediate for synthesizing drugs, etc. by simple operations in high yield, by using a specific benzylidene derivative as a raw material, reacting it in the presence of a reducing agent so that it is subjected to ring formation. CONSTITUTION:An o-phtahlaldehyde-acid shown by the formulaI(R is H or lower alkyl) or its ester derivative is reacted with an aniline derivative shown by the formula II (X is H, CF3, or halogen), to give quantitatively a benzylidene shown by the formula III, which is not isolated, reacted in the presence of 1-3 times the molar quantity of a reducing agent such as NaBH4, KBH4, etc. in a solvent such as methanol, ethanol, diglyme(preferably methanol) at room temperature or under heating, so that it is subjected to ring formation, to give the desired compound shown by the formula IV. The use of CH3OH as a solvent can make the recovery easily and prepare the desired compound inexpensively. USE:An intermediate for preparing a phthalimide derivative shown by the formula V having medicinal effects such as antiphlogistic action, analgesic action, antipyretic action, etc.