Regioselective Alkylation of Carbohydrate Derivatives Catalyzed by a Diarylborinic Acid Derivative
作者:Lina Chan、Mark S. Taylor
DOI:10.1021/ol200990e
日期:2011.6.17
Regioselective, catalyst-controlled monoalkylations of cis-vicinal diol motifs in carbohydrate derivatives, using a diphenylborinic ester precatalyst, are described. Selective installation of benzyl, naphthylmethyl, 4-bromobenzyl and benzyloxymethyl protective groups at a single secondary hydroxy group of ten representative carbohydrate derivatives illustrates the scope of this method. This new mode
The regioselectivity of tributyltin ether-mediated benzylation of 1,6-anhydro-β-d-hexoipyranoses
作者:M. Carmen Cruzado、Manuel Martin-Lomas
DOI:10.1016/0008-6215(88)84142-9
日期:1988.5
Abstract The benzylation of 1,6-anhydro-β- d -galactopyranose and the manno , allo , altro , gulo , talo , gluco , and ido isomers, using bis(tributyltin) oxide and N -methylimidazole, tetrabutylammonium bromide, tetrabutylammonium iodide, or tetrabutylammonium fluoride as catalyst, has been studied. The results confirm the importance of the catalyst in the benzylation reactions and indicate that the