D. Sengupta, T. Gharbaoui, A. Krishnan
Jun 4, 2015
Citations
0
Influential Citations
8
Citations
Journal
Organic Process Research & Development
Abstract
Synthetic studies of the APD334 precursor 4-chloromethyl-1-cyclopentyl-2-(trifluoromethyl)benzene (6) are described. A two-step scalable process was developed starting from commercially available and inexpensive starting materials. An iron(III) chloride-catalyzed aryl–alkyl cross-coupling reaction provided the intermediate 1-cyclopentyl-2-(trifluoromethyl)benzene (9), which was converted to the target building block 6 by a direct regioselective chloromethylation reaction with trioxane/thionyl chloride or chlorosulfonic acid in sulfuric acid. The process was transferred to pilot-plant scale to produce >100 kg of 6 with >98 area % HPLC purity.