synthesis of 4,4′-(arylmethylene)bis(1h-pyrazol-5-ols) via multi-component reactions by using silica-bonded sulfamic acid derivatives

Authors

shekoofeh tayebi

khodabakhsh niknam

abstract

the one-pot, multi-component synthesis of 4,4′-(arylmethylene)bis(1h-pyrazol-5-ols) by tandem knoevenagel-michael reaction of phenylhydrazine, ethyl acetoacetate and aldehydes in the presence of silica-bonded n-propylpiperazine sulfamic acid (sbppsa) as a recyclable solid acid catalyst was reported. sbppsa showed much the same efficiency when used in consecutive reaction runs.

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Journal title:

iranian journal of catalysis

Publisher: islamic azad university, shahreza branch

ISSN 2252-0236

volume 2

issue 2 2012

Keywords

[ ' s i l i c a ' , ' b o n d e d n ' , ' p r o p y l p i p e r a z i n e s u l f a m i c a c i d ' , ' c a t a l y s t ' , ' a l d e h y d e s ' , 4 , ' 4 ′ ' , ' ( a r y l m e t h y l e n e ) b i s ( 1 h ' , ' p y r a z o l ' , 5 , ' o l s ) ' , ' m u l t i ' , ' c o m p o n e n t r e a c t i o n s ' ]

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