A new method of preparing 3-(2-hydroxy-2-arylethyl)--2-iminothiazolidines of the formula
and acid addition salts thereof, wherein Ar is phenyl, halophenyl, nitrophenyl or (trifluormethyl)phenyl, by protonating a starting material of the formula
wherein Ar is as defined above, R1 is chloro or bromo and R2 is lower alkyloxy, aryloxy or optionally substituted phenyl, or, R' and R2 taken together, represent an -O-radical, and subsequently reacting the thus obtained protonated intermediate with thiourea, ammonium isothiocyanate or an alkali- or earth alkaline metal isothiocyanate. The compounds of formula I are used as starting materials in the preparation of anthelmintic 2,3,5,6--tetrahydro-6-arylimidazo[2,1-b]thiazoles, in particular tetramisole and levamisole.
The starting materials of formula (II) are obtained by hydrolyzing the corresponding halides of the formula
wherein R', R2, and Ar are as defined in formula (II) and X is chloro, bromo or iodo.
The starting materials of formula (II) and the halides of formula (III) are novel compounds.
一种制备式 3-(2-羟基-2-芳基乙基)-2-亚
氨基
噻唑烷及其酸加成盐的新方法
及其酸加成盐(其中 Ar 为苯基、卤代苯基、
硝基苯基或(三
氟甲基)苯基)的新方法,通过质子化式中的起始原料
其中 Ar 如上定义,R1 为
氯或
溴,R2 为低级烷氧基、芳氧基或任选取代的苯基,或 R' 和 R2 合在一起代表-O-自由基,然后将由此获得的质子化中间体与
硫脲、异
硫氰酸铵或碱
金属或土碱
金属异
硫氰酸盐反应。式 I 的化合物可用作制备驱虫药 2,3,5,6-四氢-6-芳基
咪唑并[2,1-b]
噻唑,特别是四
咪唑和
左旋咪唑的起始原料。
式 (II) 的起始原料可通过
水解相应的式卤化物获得
其中 R'、R2 和 Ar 如式 (II) 所定义,X 为
氯、
溴或
碘。
式(II)的起始原料和式(III)的卤化物是新型化合物。