(R)-6-(trifluoromethyl)-2,3-dihydrobenzo[b][1,4]dioxine-2-carboxylic acid 、
N-{4-[(1R)-1-aminoethyl]-2-chlorophenyl}methanesulfonamide hydrochloride 在
4-二甲氨基吡啶 、
N,N-二异丙基乙胺 、 Methanaminium,N-[(dimethylamino)(3H-1,2,3-triazolo[4,5-b]pyridin-3-yloxy)methylene]-N-methyl-, hexafluorophosphate(1-) 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
以36%的产率得到(R)-6-trifluoromethyl-2,3-dihydrobenzo[1,4]dioxine-2-carboxylic acid [(R)-1-(3-chloro-4-methanesulfonylaminophenyl)ethyl]amide