Optimized Synthesis of Vinyl Ether Sugars and Vinyl Glycosides through Transfer Vinylation Catalyzed by (4,7‐Ph2‐phen)Pd(OOCCF3)2
摘要:
Sugar vinyl ethers and vinyl glycosides are conveniently synthesized by catalytic transfer vinylation with butyl vinyl ether, which serves as both the solvent and source of vinyl. The air-stable catalyst (4,7-diphenyl-1,10-phenanthroline)Pd(OOCCF(3))(2) is prepared in situ from commercially available components.
O-Isopropylidenation of carbohydrates catalyzed by vanadyl triflate
摘要:
Vanadyl triflate has been identified as a mild and efficient catalyst for the chemoselective O-isopropylidenation of functionalized carbohydrates with acetone and acetone equivalents. The current protocol is compatible with a diverse array of protecting groups and the products can be readily isolated by simple aqueous wash. (c) 2006 Elsevier Ltd. All rights reserved.