Sequential Functionalizations of Carbohydrates Enabled by Boronic Esters as Switchable Protective/Activating Groups
作者:Ross S. Mancini、Jessica B. Lee、Mark S. Taylor
DOI:10.1021/acs.joc.7b01605
日期:2017.9.1
glycosylation of the boronicester, a variety of selectively protected di- and trisaccharide derivatives can be accessed in an operationally simple fashion without purification of intermediates. This Lewis base-triggered switching of behavior from “latent” to “active” nucleophile is a unique feature of boronicesters relative to other protective groups for diol moieties in carbohydrate chemistry.
Site-Selective, Copper-Mediated <i>O</i>-Arylation of Carbohydrate Derivatives
作者:Victoria Dimakos、Graham E. Garrett、Mark S. Taylor
DOI:10.1021/jacs.7b09420
日期:2017.11.1
site-selective, copper-promoted couplings of boronic acids with carbohydrate derivatives. These reactions generate sugar-derived aryl ethers, a structural class that is challenging to generate by other means and has not previously been accessed in a site-selective fashion. Experimental evidence and computational modeling suggest that the formation of a sugar-derived boronic ester intermediate is crucial to the
The invention disclosed in this document is related to the field of pesticides and their use in controlling pests. A compound having the following structure is disclosed.
Regioselective, tin-free sulfation of a number of unprotected glycopyranosidesderived from L-fucose, L-rhamnose, D-arabinose, D-glucose, D-galactose, and D-trehalose was achieved by using phenylboronic acid for masking the hydroxy groups and a 2,2,2-trichloroethyl-protected sulfurylimidazolium salt as the sulfating reagent. The formation of phenylborate ester remarkably improved the solubility of