Highly Efficient Catalytic Formation of (<i>Z</i>)-1,4-But-2-ene Diols Using Water as a Nucleophile
作者:Wusheng Guo、Luis Martínez-Rodríguez、Eddy Martin、Eduardo C. Escudero-Adán、Arjan W. Kleij
DOI:10.1002/anie.201603638
日期:2016.9.5
The first general catalytic and highly stereoselective formation of (Z)‐1,4‐but‐2‐ene diols is described from readily available and modular vinyl‐substituted cyclic carbonate precursors using water as a nucleophilicreagent. These 1,4‐diol scaffolds can be generally prepared in high yields and with ample scope in reaction partners using a simple synthetic method that does not require the presence of
Catalytic effect of aluminium chloride on the example of the conversion of sugar model compounds
作者:Martin Schwiderski、Andrea Kruse
DOI:10.1016/j.molcata.2015.03.018
日期:2015.6
In this work, the catalytic effect of the Bronsted acid hydrochloric acid, the Bronsted base sodium hydroxide and the Lewis acid AlCl3 on the conversion of biomass derived carbohydrates is investigated. On the example of the glycolaldehyde conversion, it is shown that the Lewis acid catalyses the ketol-endiol-tautomerism, the dehydration, the retro-aldol-reaction and the benzilic-acid-rearrangement. The main products are C-4- and C-6-carbohydrates as well as their secondary products 2-hydroxybut-3-enoic acid 1 and several furans. Under the same reaction conditions hydrochloric acid catalyzes mainly the dehydration and sodium hydroxide the tautomerism and subsequent aldolization. (C) 2015 Elsevier B.V. All rights reserved.