Mild and Direct Access to 7-Substituted-4-trifluoromethylpyrimido[1,2-b]pyridazin-2-one Systems
作者:Mohamed Abarbri、Julien Petrignet、Emilie Thiery、Laurence Silpa
DOI:10.1055/s-0033-1340664
日期:——
New and efficient methods for the synthesis of 7-substituted-4-trifluoromethylpyrimido[1,2-b]pyridazin-2-one derivatives using either two-step Suzuki/heterocyclization, or two-step heterocyclization/substitution sequences are developed. A variety of substituted products are obtained in good to excellent yields from 3-amino-6-chloropyridazine and ethyl 4,4,4-trifluorobut-2-ynoate.