Convenient syntheses of 1,2-anhydro-3,4:5,6-di-O-isopropylidene-d-glucitol and -d-mannitol
作者:Henk Regeling、Gordon J.F. Chittenden
DOI:10.1016/0008-6215(89)84134-5
日期:1989.7
Synthese des composes du titre a partir de di-«O»-isopropylidene-3,4:5,6 glucitol et de l'ester de methyle de l'acide di-«O»-isopropylidene-3,4:5,6 «O»-tosyl-2 gluconique
Selective deprotection of terminal isopropylidene acetals and trityl ethers using HClO4 supported on silica gel
作者:Aditi Agarwal、Yashwant D. Vankar
DOI:10.1016/j.carres.2005.04.005
日期:2005.7
Terminal isopropylideneacetals are selectively cleaved to the corresponding 1,2-diols in good to excellent yields in 6-24 h at room temperature by using the 'HClO4.SiO2' reagent system. Likewise, trityl ethers are readily cleaved to the corresponding alcohols in good to excellent yields within 2-3 h at room temperature. Work-up involves merely filtration of the reagent followed by purification of
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.