Stereoselective oxidative spiroketalization of a C-arylglucal derived from palladium-catalyzed coupling. Synthesis of the C-arylglucoside spiroketal nucleus of the papulacandins
Stereoselective oxidative spiroketalization of a C-arylglucal derived from palladium-catalyzed coupling. Synthesis of the C-arylglucoside spiroketal nucleus of the papulacandins
The preparation of <i>C</i>-aryl glucals via palladium-catalyzed cross-coupling methods
作者:Richard W. Friesen、Richard W. Loo、Claudio F. Sturino
DOI:10.1139/v94-160
日期:1994.5.1
prepared by the palladium-catalyzed cross coupling of 1-tributylstannyl-3,4,6-tri-O-(tert-butyldimethylsilyl)-D-glucal (11) and arylbromides. The major by-product in all of these reactions is the dimer 33, the product of homocoupling of 11. Alternatively, the C-aryl glucals 34–40 can be obtained from the palladium-catalyzedcoupling of 1-iodo-3,4,6-tri-O-(triisopropylsilyl)-D-glucal (16) and a variety