Facile and convenient strategy towards synthesis of 4-substituted 2-aminothiazolo[4,5-d]pyridazinones
作者:Amol A. Thorave、Pinkal N. Prajapati、Jignesh P. Pethani、Krunal C. Kothari、Mukul R. Jain、Pankaj R. Patel、Rajendra K. Kharul
DOI:10.1016/j.tetlet.2009.07.105
日期:2009.10
Convenient synthesis of 4-substituted 2-aminothiazolo[4,5-d]pyridazinones has been achieved in 12 steps with overall yield of 19% by employing Grignard reaction as the key step. The route utilizes well established thiazole ring formation followed by Grignard reaction to introduce substitution at 4-position effectively. In addition to the use of inexpensive chemicals, the present route first time gave
通过采用格氏反应作为关键步骤,分12个步骤实现了4取代的2-氨基噻唑并[4,5- d ]哒嗪酮的便捷合成,总收率为19%。该途径利用充分建立的噻唑环形成,随后进行格氏反应以有效地在4位引入取代。除了使用廉价的化学品外,本路线还首次获得了在C-2位带有游离氨基的4-取代的2-氨基噻唑并[4,5- d ]哒嗪酮。