已经建立了新的I 2催化的β-酮腈与磺酰肼的多组分双环化反应,为未报告的吡唑并[1,5 - a ]嘧啶-4-磺酸盐提供了直接且无金属的通道。后者可以在存在碱的情况下定量转化为致密的吡唑并[1,5- a ]嘧啶。使用磺酰肼作为亚磺酰化剂,得到的吡唑并[1,5- a ]嘧啶使I 2催化的空前的二苯甲基化反应通过直接的C(sp 2)-H键双官能化作用来获得完全取代的吡唑并[1,5- a ]嘧啶。
(2021). Development of 7-Aminopyrazolo[1,5-a]pyrimidines as Anti-Candida and AntibacterialAgents. Organic Preparations and Procedures International: Vol. 53, No. 1, pp. 42-51.
An NMR and Computational Study of Azolo[<i>a</i>]pyrimidines with Special Emphasis on Pyrazolo[1,5-<i>a</i>]pyrimidines
作者:Ranjana Aggarwal、Virender Kumar、Gulshan Singh、Dionisia Sanz、Rosa M. Claramunt、Ibon Alkorta、Goar Sánchez-Sanz、José Elguero
DOI:10.1002/jhet.1955
日期:2015.3
3‐oxo‐3‐phenylpropanenitrile and two of its p‐substituted derivatives affords 2,5‐diaryl‐7‐aminopyrazolo[1,5‐a]pyrimidines. A mechanism for this unexpected reaction involving the formation of hydrazine is proposed. The position of the aryl substituents on the bicyclic ring has been established by the combined use of NMR and DFT calculations. Moreover, the chemical shifts have been calculated, and some general rules
双功能化合物3(5)-氨基-5(3)-肼基吡唑与3-氧代-3-苯基丙腈及其两个对位取代衍生物的反应得到2,5-二芳基-7-氨基吡唑并[1, 5- a ]嘧啶。提出了这种涉及肼形成的意外反应的机理。通过结合使用NMR和DFT计算,已经确定了双环上芳基取代基的位置。此外,已经计算出化学位移,并且已经撤销了一些通用规则。