4-Phenylspiro[2.2]pentane-1,1-dicarboxylate: synthesis and reactions with EtAlCl2 and 4,5-diazaspiro[2.4]hept-4-ene derivative
作者:Dmitry A. Denisov、Denis D. Borisov、Konstantin V. Potapov、Roman A. Novikov、Yury V. Tomilov
DOI:10.1016/j.mencom.2019.07.020
日期:2019.7
Cyclopropanation of 1-methylidene-2-phenylcyclopropane with dimethyl diazomalonate affords new dimethyl 4-phenyl-spiro[2.2]pentane-1,1-dicarboxylate. On contact with EtAlCl2, this compound undergoes opening of both cyclopropane rings to give dimethyl (2-chloromethyl-3-phenylallyl)malonate. Its EtAlCl2-assisted reaction with methyl 5′-methylspiro[cyclo-propane-1,3′-pyrazoline]-5′-carboxylate proceeds
用重氮丙二酸二甲酯对1-亚甲基-2-苯基环丙烷进行环丙烷化,得到新的4-苯基-螺[2.2]戊烷-1,1-二羧酸二甲酯。与EtAlCl 2接触时,该化合物经历两个环丙烷环的打开,得到(2-氯甲基-3-苯基烯丙基)丙二酸二甲酯。它与5'-甲基螺[环丙烷-1,3'-吡唑啉] -5'-羧酸甲酯的EtAlCl2-辅助反应按1,3:1',5'-加成进行,主要生成3-(2-氯乙基)-1-环丙基甲基-1H-吡唑啉衍生物。