Synthesis of Silylallene Glycosides and Diene Diglycosides by C-Glycosidation of d-Glucal with 1,4-Bis(trimethylsilyl)-2-butyne
摘要:
Silylmethylallenyl glycosides, symmetrical and unsymmetrical diene glycosides, were synthesized by C-glycosidation with 1,4-bis(trimethylsilyl)2-butyne in good yield. The nature of the product is controlled by the choice of Lewis acid, (BF3OEt2)-O-., or SnCl4. The efficient construction of unsymmetrical diene glycosides was achieved in one pot on the basis of the order of addition of sugar starting materials.