申请人:Agfa Gevaert Aktiengesellschaft
公开号:US05336780A1
公开(公告)日:1994-08-09
Pyrazolo[5,1-c][1,2,4]triazoles of the general formula I ##STR1## in which R.sup.1 and R.sup.2 represent alkyl, cycloalkyl, aralkyl, aryl, alkoxy or heterocyclic radicals, R.sup.3 is hydrogen, halogen or an alkyl, cycloalkyl, aralkyl, aryl or heterocyclic radical bonded via a hetero atom, wherein R.sup.2 and R.sup.3 may be closed to form a ring, and R.sup.4 is hydrogen or an acyl radical, are prepared from 3(5)-amino-pyrazoles of the general formula II ##STR2## in which R.sup.2 and R.sup.3 have the abovementioned meaning, by reaction with a hydroximoyl halide of the general formula III ##STR3## in which R.sup.1 has the abovementioned meaning and X represents chlorine or bromine, in the presence of a tertiary base to give a 5-amino-1-hydroximoyl-pyrazole, subsequent reaction with an aliphatic or aromatic sulphonyl chloride in the presence of a tertiary base to give an O-sulphonated 5-amino-1-hydroximoyl-pyrazole, acylation to give an O-sulphonated 5-acylamino-1-hydroximoyl-pyrazole or 5-bisacylamino-1-hydroximoyl-pyrazole and then treatment with bases. The optionally O-sulphonated 5-amino-1-hydroximoyl-pyrazoles or O-sulphonated 5-acylamino- and 5-bisacylamino-1-hydroximoyl-pyrazoles are new valuable intermediates for the synthesis of pyrazolo[5,1-c][1,2,4]-triazoles.
一般式I的Pyrazolo [5,1-c] [1,2,4]三唑化合物## STR1 ##
其中R.sup.1和R.sup.2代表烷基,环烷基,芳基烷基,芳基,烷氧基或杂环基,R.sup.3是氢,卤素或通过杂原子键合的烷基,环烷基,芳基烷基,芳基或杂环基,其中R.sup.2和R.sup.3可以闭合形成环,而R.sup.4是氢或酰基基团,通过与一般式III的羟肟酰卤的反应,其中R.sup.1具有上述含义,X代表氯或溴,在三级碱的存在下,从一般式II的3(5)-氨基吡唑制备出5-氨基-1-羟肟基-吡唑,随后与脂肪族或芳香族磺酰氯在三级碱的存在下反应,得到O-磺酸化的5-氨基-1-羟肟基-吡唑,酰化得到O-磺酸化的5-酰基氨基-1-羟肟基-吡唑或5-双酰基氨基-1-羟肟基-吡唑,然后进行碱处理。可选的O-磺酸化的5-氨基-1-羟肟基-吡唑或O-磺酸化的5-酰氨基和5-双酰基氨基-1-羟肟基-吡唑是合成Pyrazolo [5,1-c] [1,2,4]三唑的有价值的新中间体。