2,4-二溴丁酸甲酯 、 4,4-二氟环己胺盐酸盐 以yielded methyl 1-(4,4-difluorocyclohexyl)azetidine-2-carboxylate as a brown oil (30%)的产率得到methyl 1-(4,4-difluorocyclohexyl)azetidine-2-carboxylate
The invention relates to a compound of formula (I)
wherein A
1
to A
3
and R
1
to R
3
are defined as in the description and in the claims. The compound of formula (I) can be used as a medicament.