The synthesis of α,β-unsaturated 18αH,19βH-ursane methyl ketones
摘要:
An efficient and facile synthetic technique of a new alpha,beta-unsaturated ketones of 18 alpha H,19 beta H-ursane type from betulin and a possibility of their further heterocyclization to C20 pyrazoline derivative are reported. The synthetic scheme involves aldol condensation of 18 alpha H,19 beta H-urs-20(21)-ene 30-aldehyde with acetone as a key stage.[GRAPHICS]
The synthesis of α,β-unsaturated 18αH,19βH-ursane methyl ketones
摘要:
An efficient and facile synthetic technique of a new alpha,beta-unsaturated ketones of 18 alpha H,19 beta H-ursane type from betulin and a possibility of their further heterocyclization to C20 pyrazoline derivative are reported. The synthetic scheme involves aldol condensation of 18 alpha H,19 beta H-urs-20(21)-ene 30-aldehyde with acetone as a key stage.[GRAPHICS]