7-溴-1-庚醇 、
2-[(7-溴庚基)氧基]四氢-2H-吡喃 、
2-(2,3-Difluorophenoxy)-1-ethanol 以affording 2-(7-[2-(2,3-difluoro-phenyl)-ethoxy]-heptyloxy)-tetrahydro-pyran, which after deprotection in step 3的产率得到2-(7-[2-(2,3-difluoro-phenyl)-ethoxy]-heptyloxy)-tetrahydro-pyran