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
    • 10. 发明申请
    • A PROCESS FOR THE PREPARATION OF 2,2-DIMETHYL-5-(4-CHLOROBENZYL) CYCLOPENTANONE AND AN INTERMEDIATE USEFUL THEREFOR
    • 制备2,2-二甲基-5-(4-氯苄基)环戊酮的方法及其中间体有用的方法
    • WO0200608A3
    • 2002-05-30
    • PCT/EP0106578
    • 2001-06-11
    • BASF AG
    • WONG GEORGE S K
    • C07C45/65C07B61/00C07C45/67C07C49/697C07C253/30C07C255/04C07C255/10C07C255/46C07C253/00
    • C07C255/46C07C45/673C07C49/697C07C2601/08
    • A process for the preparation of 2,2-dimethyl-5-(4-chlorobenzyl)cyclopentanone (I) by reaction isobutyronitrile with 1-bromo-3-chloropropane in the presence of a first base in a non-polar solvent to afford 5-chloro-2,2-dimethylpentanenitrile; treating said 5-chloro-2,2-dimethylpentanenitrile with a cyanide-delivering reagent in the presence of a phase-transfer catalyst to form 2,2-dimethyladiponitrile; cyclizing said 2,2-dimethyladiponitrile in the presence of a second base in a non-polar solvent to afford 3,3-dimethyl-2-amino-1-cyanocyclopentene; hydrolyzing said 3,3-dimethyl-2-amino-1-cyanocyclopentene in the presence of an acid to give 5-cyano-2,2-dimethylcyclopentanone; treating said 5-cyano-2,2-dimethylcyclopentanone with 4-chlorobenzyl chloride in the presence of a third base in a polar aprotic solvent to form 5-(4-chorobenzyl)-5-cyano-2,2-dimethylcyclopentanone; and hydrolyzing said 5-(4-chlorobenzyl)-5-cyano-2,2-dimethylcyclopentanone in the presence of an acid to give the desired 5-(4-chlorobenzyl)-2,2-dimethylcyclopentanone; the compound, 5-(4-chlorobenzyl)-5-cyano-2,2-dimethylcyclopentanone.
    • 通过反应异丁腈与1-溴-3-氯丙烷在非极性溶剂中的第一碱存在下制备2,2-二甲基-5-(4-氯苄基)环戊酮(I)的方法,得到5 氯-2,2-二甲基戊腈; 在相转移催化剂存在下用氰化物递送剂处理所述5-氯-2,2-二甲基戊腈以形成2,2-二甲基己二腈; 在第二碱的存在下在非极性溶剂中使所述2,2-二甲基己二腈环化,得到3,3-二甲基-2-氨基-1-氰基环戊烯; 在酸存在下水解所述3,3-二甲基-2-氨基-1-氰基环戊烯,得到5-氰基-2,2-二甲基环戊酮; 在极性非质子溶剂中在第三碱存在下用4-氯苄基氯处理所述5-氰基-2,2-二甲基环戊酮以形成5-(4-氯苄基)-5-氰基-2,2-二甲基环戊酮; 并在酸存在下水解所述5-(4-氯苄基)-5-氰基-2,2-二甲基环戊酮,得到所需的5-(4-氯苄基)-2,2-二甲基环戊酮; 化合物,5-(4-氯苄基)-5-氰基-2,2-二甲基环戊酮。