Novel Synthesis of Castanospermine and 1-Epicastanospermine
摘要:
Polyhydroxylated indolizidines have potential for treatment of HIV, hepatitis C and HSV infection, multiple sclerosis, angiogenesis, cancer, and diabetes. A new synthetic approach to the title compounds from a 5-C-methoxypyranosyl azide has been developed. The route incorporates lid the aldol reaction and a novel catalytic reductive amination cascade to generate the indolizidine ring.
The chemistry of castanospermine. Direct oxidation of the tetraacetate to the corresponding γ-lactam
作者:Richard H Furneaux、Graeme J Gainsford、Jennifer M Mason、Peter C Tyler
DOI:10.1016/j.carres.2004.05.006
日期:2004.7
From the products of oxidation of tetra-O-acetylcastanospermine (2) with N-bromosuccinimide, only the gamma-lactam 11 was isolated (19%). Treatment of this lactam with DBU in dichloromethane afforded the elimination product 12, while deacetylation with sodium methoxide in methanol gave tetraol 13 together with diene 14. The X-ray crystal structure of compound 13 is reported.