Sulfuric acid immobilized on silica gel is designed as a very useful catalyst for synthesis of 2,3-unsaturated glycopyranosides. This handy,metal-free,environment friendly transformation provides high yields andα-stereoselectivities in a very few amount （0.02 eq.） of catalyst and in short reaction times（10 min）.
Jia Fen ZhouXuan ChenQing Bing WangBo ZhangLi Yah ZhangAbdullah YusulfZhong Fu WangJian Bo ZhangJie Tang
