Spiro Derivatives of Tetrahydrothiophene. Synthesis of the Quinolizidine <3-spiro-2′> tetrahydrothiophene System Using Solid/Liquid or Liquid/Liquid Phase-Transfer Catalysis
作者:Jerzy T. Wróbel、Elżbieta Hejchman
DOI:10.1055/s-1987-33430
日期:——
4-Oxooctahydroquinolizine<3-spiro-2′>tetrahydrothiophene 1′,1′-dioxide can be synthetized from 2-cyanotetrahydrothiophene by two independent routes, both of them using phase-transfer catalysis: the first one involves alkylation of 2-cyanotetrahydrothiophene under PTC conditions, the second one N-acylation of 2-(2-chloroethyl)piperidine with 2-chlorocarbonyltetrahydrothiophene with the final cycloalkylation being performed under PTC conditions. Two stereoisomers of the spiro compound are obtained.
4-氧代八氢喹啉<3-螺-2'>四氢噻吩1',1'-二氧化物可以通过两条独立的途径从2-氰基四氢噻吩合成,两者均使用相转移催化:第一条途径涉及在PTC条件下对2-氰基四氢噻吩进行烷基化,第二条途径则是使用2-氯乙基哌啶与2-氯羰基四氢噻吩进行N-酰化,最后在PTC条件下进行环烷基化。得到两个螺旋化合物的立体异构体。