Regioselective deprotection of p-methoxybenzyl ethers of furanose derivatives
摘要:
Reaction of per-p-methoxybenzylated hexofuranoses and pentofuranoses with either a catalytic amount of tin chloride dihydrate (SnCl2. 2H(2)O) or 0.5-10% solution of trifluoroacetic acid in dichloromethane afforded regioselectively the corresponding monosaccharide derivatives having a single free hydroxyl group at C(5) in good yields. (C) 1999 Elsevier Science Ltd. All rights reserved.
ZEOLITE-MEDIATED CONVERSION OF ALCOHOLS TO<i>p</i>-METHOXYBENZYL ETHERS
作者:G. V. M. Sharma、Sreenivas Punna、A. Ratnamala、V. Durga Kumari、M. Subrahmanyam
DOI:10.1080/00304940409355975
日期:2004.12
The protection of functional groups1 is very important for the successful synthesis of complex molecules. The p-methoxybenzyl (PMB) and 3,4dimethoxybenzyl @MB) groups have proven their usefulness for the protection of hydroxy groups because of the ease with which they can be removed under neutral and mild conditions [2,3-dichloro-5,6 dicyano-benzO-l,4quinone (DDQ) in aqueous dichloromethane2 or DDQ-M~(OAC)
Nascent-HBr-Catalyzed Removal of Orthogonal Protecting Groups in Aqueous Surfactants
作者:Shilpi Gupta、Smritilekha Bera、Dhananjoy Mondal
DOI:10.1021/acs.joc.9b02561
日期:2020.2.21
the hydrophobic core of the confined micellar medium in aqueous surfactant is described for the first time. The sustained-release nascent-HBr enabled the chemoselective cleavages of acid-sensitive orthogonal functionalities present in carbohydrates, amino alcohols, and hydroxylated acyclic compounds in good to excellent yields.