Vilsmeier reagent-mediated synthesis of 6-[(formyloxy)methyl]-pyrazolopyrimidines via a one-pot multiple tandem reaction
作者:Shi-Han Lu、Po-Lin Liu、Fung Fuh Wong
DOI:10.1039/c5ra07707a
日期:——
les as the starting material was developed for the efficient synthesis of 6-[(formyloxy)methyl]-1H-pyrazolo[3,4-d]pyrimidine. This new multiple tandem reaction, involving the Vilsmeier–Haack reaction, the Morgan–Walls reaction, sequential elimination, substitution, and final hydrolysis, afforded formyloxymethyl pyrazolo[3,4-d]pyrimidine products in good yields.
以5-(2-氯乙酰氨基)吡唑为起始原料,开发了一种新的Vilsmeier试剂介导的一锅反应,用于有效合成6-[((甲酰氧基)甲基] -1 H-吡唑并[3,4- d ]嘧啶。这种新的多级串联反应,包括Vilsmeier-Haack反应,Morgan-Walls反应,顺序消除,取代和最终水解,可提供高收率的甲酰氧基甲基吡唑并[3,4- d ]嘧啶产物。
An efficient and convenient transformation of α-haloketones to α-hydroxyketones using cesium formate
作者:Fung Fuh Wong、Po-Wei Chang、Hui-Chang Lin、Bang-Jau You、Jiann-Jyh Huang、Shao-Kai Lin
DOI:10.1016/j.jorganchem.2009.06.031
日期:2009.10
A new safe and convenient transformation has been developed. In the presence of cesium formate in dry MeOH solution, alpha-haloketones underwent direct conversion reaction to afford alpha-hydroxyketone in excellent yields. Furthermore, this methodology can be extended and applied in 2-chloro-N-(1,3-diphenyl-1H-pyrazol-5-yl)acetamide, 2-chloro-N-(2,6-dimethylphen-yl)acetamide, 1-(bromomethylsulfonyl)benzene, and N-(bromomethyl)phthalimide to give the corresponding products in moderate to excellent yields. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved.