StarchSulfuric Acid (SSA) as Catalyst for a One-Pot Synthesis of 1,5-Diaryl-1<i>H</i>-pyrazoles
作者:Farhad Hatamjafari
DOI:10.1002/hlca.201200621
日期:2013.8
Protocols with starchsulfuricacid (SSA) as reusable catalyst for the synthesis of aryl‐1H‐pyrazoles are described. SSA acted as an efficient and environmentally friendly catalyst for the regioselective condensation of BaylisHillman adducts 1 with phenylhydrazine hydrochloride leading to the new 1,5‐diaryl‐1H‐pyrazole 2a–2e in excellent yields (Scheme and Table 1).