Selective O-deallylation of dihydropyrazoles has been achieved by use of iodine (10 mol%) in PEG-400 as ecofriendly solvent. Iodine (10 mol%) in dimethyl sulfoxide at 100 °C also afforded O-deallylation with aromatization compatible with highly reactive N-allyl and formyl groups. The function of iodine in the synthesis of substituted pyrazoles under different conditions is described.
在P
EG-400中加入10 mol%的
碘作为环保溶剂,实现了
二氢吡唑的选择性O-脱烷基化。在100 °C下,在
二甲基亚砜中加入10 mol%的
碘,也能实现O-脱烷基化,且与高反应性的N-烯丙基和甲酰基的芳香化相容。本文介绍了
碘在不同条件下合成取代
吡唑的作用。