Transferreaktionen mit hilfe von bleitetraacetat—V
作者:E. Zbiral、G. Nestler
DOI:10.1016/s0040-4020(01)91627-8
日期:1971.1
The reaction of the twofold branched steroidolefines 1-5 with the system Pb(OAc4-(CH3)3SiN3 at a temperature of −20°C yields the α-azidoketones. 1a-5a with the azido group in an axial position. The 3α-azido-2-oxo-steroids 1a-3a can be transformed at silicagel surface into the epimeric 3β-azido-2-oxosteroids 1b-3b. Furthermore, the by-products 7α(-azido-3β-OAc-cholest-5-en 6 and 3β-OAc-7-oxo-cholest-5-en