Twenty-five new hydroxyand methoxy-substituted 4,6-diarylpyrimidin-2(1H)-ol (20–34) and 4,6-diarylpyrimidine-2(1H)-thiol derivatives (35–44) were synthesized from the reaction of the corresponding 1,3-diaryl-2-propene-1one compounds (1–19) with urea or thiourea using the solid-phase microwave method. All the new synthetic compounds (20–44) were evaluated with regard to their α -glucosidase activity
Polysulfide-promoted conversions of ene carbonyls. Arrangements of o-methoxy-substituted chalcone units incorporated into product thiolanes
作者:Robert T. LaLonde、LynnMarie Codacovi、Cun Heng He、Cang Fu Xu、Jon Clardy、Bala S. Krishnan
DOI:10.1021/jo00375a026
日期:1986.12
Bu
<sub>4</sub>
NHSO
<sub>4</sub>
‐Catalyzed Direct
<i>N</i>
‐Allylation of Pyrazole and its Derivatives with Allylic Alcohols in Water: A Metal‐Free, Recyclable and Sustainable System
functional building blocks. Direct N-allylation of pyrazole and its derivatives as an atom economic strategy to provide allylic amines has been achieved only using commercial Bu4NHSO4 as the metal-free catalyst and water as the solvent without any additives. 11–93% isolated yields were obtained for the N-allylation of pyrazole and its derivatives with allylic alcohols. Bu4NHSO4 could be reused for
烯丙胺是有价值的功能性构件。吡唑及其衍生物的直接N-烯丙基化作为提供烯丙胺的原子经济策略已经实现,仅使用商业 Bu 4 NHSO 4作为无金属催化剂和水作为溶剂而没有任何添加剂。吡唑及其衍生物与烯丙醇的N-烯丙基化获得了 11-93% 的分离产率。布4 NHSO 4可通过简单提取重复使用六次,几乎不损失催化活性,也适用于克级规模生产。烯丙醚和吡唑没有发生反应以得到所需产物表明烯丙醚不是该途径中的活性中间体。密度泛函理论 (DFT) 计算表明,底物、溶剂和催化剂之间存在氢键作用,尤其是烯丙醇和 H 2 O之间形成的氢键作用。不同质子溶剂中的对照实验进一步证明了烯丙醇和水的分子间氢键.