A highly site-selective NHC-catalyzed benzoin-type cyclization of unsymmetrical dialdoses was achieved.
实现了高度对称的NHC催化的非对称拨号酶的安息香型环化。
Cu(ClO<sub>4</sub>)<sub>2</sub>·6H<sub>2</sub>O catalyzed solvent free per-O-acetylation and sequential one-pot conversions of sugars to thioglycosides
The solvent free per-O-acetylation of various reducing and non-reducing sugars has been carried out using stoichiometric amounts of acetic anhydride and copper(ii) perchlorate hexahydrate as the catalyst.
Elaboration of the ether cleaving ability and selectivity of the classical Pearlman's catalyst [Pd(OH)2/C]: concise synthesis of a precursor for a myo-inositol pyrophosphate
作者:Alson Mart、Mysore S. Shashidhar
DOI:10.1016/j.tet.2012.09.016
日期:2012.11
The cleavage of propargyl, allyl, benzyl, and PMB ethers by Pd(OH)2/C can be tuned in that order, by varying the reaction conditions. Other moieties such as C–C double bonds, esters, trityl ether, p-bromo and p-nitrobenzyl ethers are stable to these reaction conditions. Cleavage of allyl ethers can be made catalytic by using 1:1 mixture of Pd(OH)2/C and Pd/C. The synthetic potential of the selective
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
Protecting group directed stereoselective reduction of an epi-inosose: efficient synthesis of epi-inositol
作者:Madhuri T. Patil、Shobhana Krishnaswamy、Manash P. Sarmah、Mysore S. Shashidhar
DOI:10.1016/j.tetlet.2011.05.051
日期:2011.7
A facile and high yielding synthesis of epi-inositol via stereoselectivereduction of a pentaprotected epi-inosose is reported. Extent of stereoselectivity during the hydride reduction appears to depend on the ability of the substrate to complex with metal ions in the reducing agent.