DRUMMOND, JAMES T.;JOHNSON, GRAHAM, J. HETEROCYCL. CHEM., 25,(1988) N 4, C. 1123-1127
作者:DRUMMOND, JAMES T.、JOHNSON, GRAHAM
DOI:——
日期:——
Selective method for the preparation of isomeric<i>N</i>-alkyl and<i>N</i>-aryl-3(5)-amino-5(3)-hydroxy-1<i>H</i>-pyrazole-1-carboxamides
作者:James T. Drummond、Graham Johnson
DOI:10.1002/jhet.5570250416
日期:1988.7
As part of a program to develop novel mechanism based skeletal muscle relaxants we identified 5-amino-3-hydroxy-1H-pyrazole-1-carboxamide (1) as a potential structural lead. This highly functionalized pyrazole was prepared via a published procedure [1] (Scheme 1, R1 = R1 = H), which utilized 3,5-dimethyl-1H-pyrazole-1-carboxamide as an aminocarbonyl transfer reagent, to give with cyanoacethydrazide
作为开发基于新型机制的骨骼肌松弛剂的程序的一部分,我们确定了5-amino-3-hydroxy-1 H -pyrazole-1-carboxamide(1)作为潜在的结构线索。通过公开的方法[1](方案1,R 1 = R 1 = H)制备这种高度官能化的吡唑,该方法使用3,5-二甲基-1 H-吡唑-1-羧酰胺作为氨基羰基转移试剂,得到与氰基乙酰肼一起的氨基脲中间体6。碱催化的6环化反应得到初始的铅化合物。该反应方案扩展到合成另外的4-烷基-和4-芳基-5-氨基-3-羟基-1 H-吡唑-1-羧酰胺(表1)。