Bromodimethylsulfonium bromide (BDMS) mediated dithioacetalization of carbohydrates under solvent-free conditions
作者:Abu T. Khan、Md. Musawwer Khan
DOI:10.1016/j.carres.2010.07.044
日期:2010.10
A variety of diethyl dithioacetals of sugars can be prepared in very good yields by the reaction of various monosaccharides with ethanethiol in the presence of 3 mol% bromodimethylsulfonium bromide (BDMS) at 0-5 degrees C. Similarly, dipropyl dithioacetal derivatives can also be obtained in good yields using propanethiol under identical reaction conditions. These dithioacetal derivatives were characterized
Regioselective Synthesis of Difluorinated <i>C</i>-Furanosides Involving a Debenzylative Cycloetherification
作者:Julien A. Delbrouck、Valentin N. Bochatay、Abdellatif Tikad、Stéphane P. Vincent
DOI:10.1021/acs.orglett.9b01878
日期:2019.7.19
A highly regioselective synthesis of valuable gem-difluorinated C-furanosides from unprotected aldoses via a debenzylative cycloetherification (DBCE) reaction induced by diethylaminosulfur trifluoride is descibed. The scope and limitations of this DBCE reaction are described using a series of commercially available pentoses and hexoses to afford, without selective protection/deprotection sequences
Prodrugs of L-cysteine as protective agents against acetaminophen-induced hepatotoxicity. 2-(Polyhydroxyalkyl)- and 2-(polyacetoxyalkyl)thiazolidine-4(R)-carboxylic acids
作者:Jeanette C. Roberts、Herbert T. Nagasawa、Richard T. Zera、Robert F. Fricke、David J. W. Goon
DOI:10.1021/jm00393a034
日期:1987.10
prodrugs of L-cysteine (1a-h) were synthesized by the condensation of the sulfhydryl amino acid with naturally occurring aldose monosaccharides containing three, five, and six carbon atoms. The resulting 2-(polyhydroxyalkyl)thiazolidine-4(R)-carboxylicacids (TCAs) are capable of releasing L-cysteine and the sugars by nonenzymatic ring opening and hydrolysis. Thus, when added to rat hepatocyte preparations
Kinetic cyclohexylidenation and isopropylidenation of aldose diethyl dithioacetals
作者:T. Bruce Grindley、Christian J.P. Cote、Chandra Wickramage
DOI:10.1016/0008-6215(85)85124-7
日期:1985.7
Abstract Aldose diethyldithioacetals react with 1.2 equivalents of 1-ethoxycyclohexene or 2-methoxypropene in N , N -dimethylformamide at 0° with p -toluenesulfonic acid as catalyst to give the five-membered ring acetal attached to the two terminal oxygen atoms as the major product in every case. In most instances, a small proportion of the terminal, six-membered ring acetal was also obtained, and