Cu(II)/Triazine-Based Dendrimer as an Efficacious Recoverable Nano-catalyst for the Preparation of 1-Substituted-1<i>H</i>-1,2,3,4-Tetrazoles under Solventless Conditions
作者:Samaneh Javdan、Farid Moeinpour、Fatemeh S. Mohseni-Shahri
DOI:10.1080/00304948.2022.2057143
日期:2022.7.4
Published in Organic Preparations and Procedures International: The New Journal for Organic Synthesis (Vol. 54, No. 4, 2022)
A process for the preparation of a compound of the general formula I
is described according to which a compound of the general formula IIb
is reacted with a compound of formula III
in which
L represents a leaving group, generally carrying out the reaction in the presence of a base.
R' represents an alkylene, alkenylene or alkynylene group, having from 1 to 4 carbon atoms, and
R2 represents a heterocyclic group having a five-membered or 6-membered ring with 1 to 4 heteroatoms, selected from oxygen sulfur and nitrogen, and being linked to the adjacent sulphur atom via a ring carbon atom.
通式 I 化合物的制备工艺
的制备方法,根据该方法,通式 IIb 的化合物
与通式 III 的化合物反应
其中
L 代表离去基团,通常在碱存在下进行反应。
R' 代表具有 1 至 4 个碳原子的亚烷基、亚烯基或亚炔基,以及
R2 代表杂环基团,具有 1 至 4 个杂质原子的五元环或六元环,这些杂质原子可选 自氧、硫和氮,并通过环上的碳原子与相邻的硫原子相连。
Green Synthesis of 5-Substituted-1H-1,2,3,4-tetrazoles and 1-Sustituted-1H-1,2,3,4-tetrazoles via [3+2] Cycloaddition by Reusable Immobilized AlCl3 on γ-Al2O3
We report the effectiveness of the surface modified gamma-Al2O3 which is reusable, efficient, catalytic, safe and environmentally acceptable procedure for the conversion of both alkyl and aryl nitriles into the corresponding 5-substituted-1H-1,2,3,4-tetrazoles via [3+2] cycloaddition with sodium azide in excellent yields at mild reaction conditions (50 degrees C). The catalyst also afforded 1-substituted-1H-1,2,3,4-tetrazoles by the reaction of amines, sodium azide and triethyl orthoformate. The catalyst could be recycled and was reused eleven runs without losing its activity.