Michael-type additions in the synthesis of α-O- and -S-2-deoxyglycosides
作者:Katja Michael、Horst Kessler
DOI:10.1016/0040-4039(96)00616-8
日期:1996.5
O- and S-Nucleophiles including galactose, serine and cysteine derivatives undergo MICHAEL-typeadditions to hex-1-en-3-uloses to furnish stereoselectively the α-2-deoxy-ulosides. The keto function at C-3 can be reduced stereoelectively with NaBH4. Both configurations can be obtained depending on the presence or absence of CeCl3. Glycosylation takes place either base catalyzed with DBU (1,8-diazabicyclo[5
Copper-Mediated Cross-Coupling of Aryl Boronic Acids and Alkyl Thiols
作者:Prudencio S. Herradura、Kathleen A. Pendola、R. Kiplin Guy
DOI:10.1021/ol005832g
日期:2000.7.1
[reaction: see text] The cross-coupling of aryl boronic acids and alkanethiols mediated by copper(II) acetate and pyridine in anhydrous dimethylformamide affords aryl alkyl sulfides in good yield with a wide variety of substituted aryl boronic acids. The method is applicable to the synthesis of aryl sulfides of cysteine.