| 摘要 |
3-(3,5-Di-butyl -4-hydroxyphenyl) -1H-pyrazolo(3,4-6) pyridine derivs. of formula (I) and their salts are new. R1 = H, alkyl, alkenyl, alkynyl, cycloalkyl, opt. substd. phenyl or heteroaryl, haloalkyl, hydroxyalkyl, alkoxyalkyl, acyloxyalkyl, carboxyalkyl, alkoxycarbonylalkyl, cyanoalkyl, opt. mono- or disubstd. carbomoylalkyl, alkoxycarbonyalkyl, opt. mono- or disubstd. carbomoyloxalkyl, alkylthioalkyl, opt. substd. phenylalkyl or heteroarylalkyl, cycloalkylalkyl, (CH2)nNRaRb, alkanoyl alkoxycarbonyl, acyloxyalkanoyl, opt. substd. benzoyl or heteroaroyl, or a gp. of formula (a) Ra and Rb = H, alkyl or opt. substd. phenylalkvl, or NRaRb is a ring; n = 1-8; R4-R6 = H or alkyl, or R4+R5 or R4+R6 is a bond; v-z = 0-4; R2 and R3 = H, halogen, alkyl or haloalkyl. - Intermediates of formula (II) are also new. 7 cpds. (I), including: 1-(2-acetoxyethyl) -3-(3,5-di-t-butyl- 4-hydroxyphenyl) 1H-pyrazolo(3,4-b)pyridine are specifically claimed.
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