A process for preparing compounds of the formula ##STR1## wherein X is sulfur or oxygen; and R.sup.1 and R.sup.2 are independently selected from the group consisting of H and an alkyl group containing 1 to about 4 carbon atoms, or R.sup.1 and R.sup.2 are fused to form a benzene ring which is optionally substituted by one or more substituents independently selected from the group consisting of an alkyl group containing 1 to about 4 carbon atoms, an alkoxy group containing 1 to about 4 carbon atoms, and halogen. The process involves reacting together a 2-aminooxazole, 2-aminobenzoxazole, 2-aminothiazole or 2-aminobenzothiazole, an alkyl tetrazol-5-ylacetate, and a trialkyl orthoformate and cyclizing the resulting intermediate.
一种制备式为##STR1##的化合物的方法,其中X为
硫或氧;R.sup.1和R.sup.2分别选自H和含有1至约4个碳原子的烷基,或者R.sup.1和R.sup.2融合形成一个苯环,该苯环可以选择性地被一个或多个取代基独立地选自含有1至约4个碳原子的烷基,含有1至约4个碳原子的烷氧基和卤素的群。该方法涉及将2-
氨基
噁唑、
2-氨基苯并噁唑、
2-氨基噻唑或
2-氨基苯并噻唑、烷基
四唑-5-
乙酸酯和三烷基正
甲酸酯反应,并使所得的中间体环化。