2,3,5,6-Tetrahydro- and 5,6-dihydro-imidazo[2,1-b]thiazoles from imidazoline-2-thiol derivatives and unsaturated or halogenated acids and esters
作者:R. B. Blackshire、C. J. Sharpe
DOI:10.1039/j39710003602
日期:——
imidazoline-2-thiol with maleic anhydride and with α-bromo-dicarboxylic acids and their diethyl esters. Ethyl 2-chloro- and 4-bromoacetoacetate with imidazoline-2-thiol give derivatives of 5,6-dihydroimidazo[2,1-b]thiazole with retention of the ethoxycarbonyl group. 5-Substituted 2-thiohydantoins react in a similar way.
证据表明,咪唑啉-2-硫醇与乙炔二羧酸及其二甲基酯的反应产物是5,6-二氢咪唑并[ 2,1- b ]噻唑-3(2 H)-one的衍生物。该咪唑啉-2-硫醇与马来酸酐,α-溴-二羧酸及其二乙酯的反应可制得该环系的其他衍生物。用2-咪唑啉-2-巯基的2-氯乙酰乙酸乙酯和4-溴乙酰乙酸乙酯得到5,6-二氢咪唑并[2,1- b ]噻唑的衍生物,并保留了乙氧基羰基。5-取代的2-硫代乙内酰脲以相似的方式反应。