Glycosyl thiocyanates having hydroxyl groups protected with acetyl or benzoyl groups react readily at −40°C with Grignard reagents to afford the corresponding alkyl or aryl thioglycosides in good yields. Monosaccharide derivatives having the SCN grouping at other positions form under similar conditions thioethers. Axial thiocyanates do not react. Elevated temperatures induce side reactions leading
Influence of bromide ions on the synthesis of anomeric thiocyanates
作者:Piotr Cmoch、Zbigniew Pakulski
DOI:10.1016/j.tet.2012.06.068
日期:2012.9
The synthesis of anomeric thiocyanates with the alpha- and beta-configuration is described. Reactions performed under standard conditions afforded the 1,2-trans derivatives as the main products, whereas in the presence of the quaternary ammonium salts, the 1,2-cis-thiocyanates were formed preferentially. The strong influence of the bromide ions on the distribution of the products is discussed. (C) 2012 Elsevier Ltd. All rights reserved.
FUENTES, MOTA JOSE;CARCIA, FERNANDEZ JOSE MANUEL;ORTIZ, MELLET CARMEN;PRA+, CARBOHYDR. RES., 193,(1989) C. 314-321
作者:FUENTES, MOTA JOSE、CARCIA, FERNANDEZ JOSE MANUEL、ORTIZ, MELLET CARMEN、PRA+
DOI:——
日期:——
MOTA, JOSE FUENTES;FERNANDEZ, JOSE M. CARCIA;MELLET, CARMEN ORTIZ;ADRIAN,+, J. CARBOHYDR. CHEM., 9,(1990) N, C. 837-851
作者:MOTA, JOSE FUENTES、FERNANDEZ, JOSE M. CARCIA、MELLET, CARMEN ORTIZ、ADRIAN,+
DOI:——
日期:——
PUENTES, MOTA J.;GARCIA, FERNANDEZ J. M.;PRADERA, ADRIAN M. A.;ORTIZ, MEL+, AN QUIM., 86,(1990) N, C. 655-664
作者:PUENTES, MOTA J.、GARCIA, FERNANDEZ J. M.、PRADERA, ADRIAN M. A.、ORTIZ, MEL+