Abstract

The synthetic versatility of 4-alkoxy-4-alkyl/aryl-1,1,1-trichloroalk-3-en-2-ones (enones) for the synthesis of [1,2,4]triazolo[1,5-a]pyrimidines, in which the trichloromethyl group is either maintained or eliminated from the product by simply controlling the reaction medium, is reported. These enones react with 3-amino-1H-1,2,4-triazoles under acidic conditions to furnish exclusively 7-(trichloromethyl)-[1,2,4]triazolo[1,5-a]pyrimidines, whereas under basic conditions [1,2,4]triazolo[1,5-a]pyrimidin-5/7(1H)-ones are obtained with elimination of the trichloromethyl group. The regioselectivity of the reactions performed under basic conditions is highly influenced by the substituents present in the starting enones. Twenty-one examples are synthesized using these two methodologies, with yields of up to 86%.

The synthetic versatility of 4-alkoxy-4-alkyl/aryl-1,1,1-trichloroalk-3-en-2-ones (enones) for the synthesis of [1,2,4]triazolo[1,5-a]pyrimidines, in which the trichloromethyl group is either maintained or eliminated from the product by simply controlling the reaction medium, is reported. These enones react with 3-amino-1H-1,2,4-triazoles under acidic conditions to furnish exclusively 7-(trichloromethyl)-[1,2,4]triazolo[1,5-a]pyrimidines, whereas under basic conditions [1,2,4]triazolo[1,5-a]pyrimidin-5/7(1H)-ones are obtained with elimination of the trichloromethyl group. The regioselectivity of the reactions performed under basic conditions is highly influenced by the substituents present in the starting enones. Twenty-one examples are synthesized using these two methodologies, with yields of up to 86%.

中文翻译：

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β-烷氧基乙烯基三氯甲基酮的合成多功能性可用于获得[1,2,4] Triazolo [1,5-a]嘧啶

摘要

4-烷氧基-4-烷基/芳基-1,1,1-三氯烷基-3-en-2-ones（烯酮）的合成多功能性，可合成[1,2,4]三唑[1,5- a ]据报道，通过简单地控制反应介质，可以保持或从产物中除去三氯甲基的嘧啶。这些烯酮在酸性条件下与3-氨基-1 H -1,2,4-三唑反应，仅提供7-（三氯甲基）-[1,2,4]三唑[1,5- a ]嘧啶，而在碱性条件下条件[1,2,4] triazolo [1,5- a ]嘧啶-5/7 （1 H在消除三氯甲基的情况下获得-。在碱性条件下进行的反应的区域选择性受到起始烯酮中存在的取代基的高度影响。使用这两种方法合成了21个示例，收率高达86％。

4-烷氧基-4-烷基/芳基-1,1,1-三氯烷基-3-en-2-ones（烯酮）的合成多功能性，可合成[1,2,4]三唑[1,5- a ]据报道，通过简单地控制反应介质，可以保持或从产物中除去三氯甲基的嘧啶。这些烯酮在酸性条件下与3-氨基-1 H -1,2,4-三唑反应，仅提供7-（三氯甲基）-[1,2,4]三唑[1,5- a ]嘧啶，而在碱性条件下条件[1,2,4] triazolo [1,5- a ]嘧啶-5/7 （1 H在消除三氯甲基的情况下获得-。在碱性条件下进行的反应的区域选择性受到起始烯酮中存在的取代基的高度影响。使用这两种方法合成了21个示例，收率高达86％。