反应详情

The compounds of examples 25a and 25b were synthesized starting from benzyl 3-hydroxy-3-(2-oxycyclohenyl)azetidine-1-carboxylate prepared according to the procedure given in example 25. The ketone was reduced to give benzyl 3-hydroxy-3-(2-hydroxycyclohexyl)azetidine-1-carboxylate as a mixture of racemic diastereomers which were subjected to hydrogenation to afford 3-(2-hydroxycyclohexyl)azetidin-3-ol. 3-(2-hydroxycyclohexyl)azetidin-3-ol was then carried forward in a coupling step with 3,4-difluoro-2-(2-fluoro-4-iodophenylamino)benzoyl fluoride in the usual manner. The coupled material thus obtained was purified by preparative reverse phase HPLC where fraction 1 was tentatively assigned as (±)-1-({3,4-difluoro-2-[(2-fluoro-4-iodophenyl)amino]phenyl}carbonyl)-3-[(trans)-2-hydroxycyclohexyl]azetidin-3-ol (Example 25a) and fraction 2 was tentatively assigned as (±)-1-({3,4-difluoro-2-[(2-fluoro-4-iodophenyl)amino]phenyl}carbonyl)-3-[(cis)-2-hydroxycyclohexyl]azetidin-3-ol.

1. customThe coupled material thus obtained
2. customwas purified by preparative reverse phase HPLC where fraction 1