bridged pyranose derivatives;
ring enlargement;
carbenes;
glycosides;
D O I:
暂无
中图分类号:
O62 [有机化学];
学科分类号:
070303 ;
081704 ;
摘要:
Addition of dichlorocarbene to the glycal (+/-)-2 followed by cyclopropyl-allyl rearrangement leads to the chloro-2H-pyran (+/-)-4. Oxidation of (+/-)-4 and reduction of the obtained hydroxypyranone (+/-)-5 gave the methyl pyranoside (+/-)-6. The relative configuration of (+/-)-6 was established by X-ray structural analysis of the corresponding acetate (+/-)-7. The synthesis of the optically active starting materials (+)-2 and (-)-2 is also reported.