A Convenient Synthesis of 2'- OR 4'-Hydroxycocaine
摘要:
A short, convenient and efficient synthesis of 2'- or 4'-hydroxycocaine is described. The key step involved selective hydrolysis/transesterification of the acetoxy group of 2'- or 4'-acetoxycocaine in methanol saturated with dry HCl gas.
The synthesis of 5-iodo-5 alpha-cholestan-6-one (6), its 3 beta-acetoxy-(7) and 3 beta-chloro-(8) analogues, 3 beta-acetoxy-5-iodo-5 alpha-stigmastan-6-one (9) and its 3 beta-chloro-(10) analogue by the reacion of silver chromate-iodine and pyridine with the corresponding steroidal olefins (1-5) is described. The structures of these products have been established on the basis of their elemental, analytical and spectral data.