Nafion-H mediated selective deprotection of terminal isopropylidene acetals and trityl ethers. Application in the synthesis of a substituted piperidone
作者:Girish K. Rawal、Shikha Rani、Amit Kumar、Yashwant D. Vankar
DOI:10.1016/j.tetlet.2006.10.067
日期:2006.12
A facile chemoselective hydrolysis of terminal isopropylideneacetals has been achieved in good to excellent yields within 2–4 h using Nafion-H in methanol at ambient temperature. This procedure has been employed to synthesize a substituted piperidone derivative. Similarly, trityl ethers are also deprotected to the corresponding alcohols in excellent yields using Nafion-H at room temperature.
Synthesis of fluorinated and nonfluorinated sugar alkenylphosphonates via highly stereoselective Horner-Wadsworth-Emmons olefination
作者:Monika Bilska-Markowska、Marcin Kaźmierczak
DOI:10.1016/j.carres.2023.108941
日期:2023.11
New fluorinated and nonfluorinated sugar alkenylphosphonates were obtained. In all cases 1,2;5,6-di-O-isopropylidene-α-d-glucofuranose was used as the starting material. The synthesis of alkenylphosphonates was based on Horner-Wadsworth-Emmonsolefination. The process led to products with E-stereochemistry exclusively or predominately.