New oxabispidine compound useful in the treatment of cardiac arrhythmias

摘要

There is provided a process for the preparation of a compound of formula I, (I), or a pharmaceutically acceptable derivative thereof, wherein A, B, G, R 1 , R 2 , R 3 , R 4 and R 41 to R 46 have meanings given in the description, which process comprises the dehydrative cyclisaton of a compound of formula II, (II).