By reaction of tropine (I) with 3,5-dichlorobenzoyl chloride (II) at 140 C.
The synthesis of [11C]-labeled MDL-72222 for use in PET studies of the 5-HT3 receptor by methylation of 3,5-dichlorobenzoic acid 8-azabicyclo[3.2.1]oct-3-yl ester (I) with [11C]-labeled methyl iodide in hot acetonitrile has been described.