Abstract:
The first synthesis of the spiroacetal-containing anti-Helicobacter pylori agents ent-CJ-12,954 and ent-CJ-13,014 is reported based on the union of a heterocycle-activated spiroacetal-containing sulfone fragment with a phthalide-containing aldehyde fragment; comparison of the 1H and 13C NMR data, optical rotations and HPLC retention times of the synthetic compounds (3S,2″S,5″S,7″S)-(1a) and (3S,2″S,5″R,7″S)-(2a) and the (3R)-diastereomers (3R,2″S,5″S,7″S)-(1b) and (3R,2″S,5″R,7″S)-(2b) with the naturally occurring compounds established that the synthetic isomers (1a) and (2a) were in fact enantiomeric to the natural products CJ-12,954 and CJ-13,014.
