1-Methylpiperazine → HCID 14579227, compound

Participants

Reaction Steps

970 mg (3.1 m moles) of 4-bromo-2-phenyl-2,3,4,5-tetrahydro-1-benzoxepin-5-one (compound R14 of Reference Example 14) was dissolved in 100 ml of benzene, 3.1 g (10 equivalent amount) of N-methylpiperazine was added to the solution, and the whole was heated to reflux for 7 hours. After distilling off the solvent, water was added to the residue, and the mixture was extracted with methylene chloride. The organic phase was washed with water and dried with anhydrous magnesium sulfate. After filtrating off the magnesium sulfate, the filtrate was concentrated to obtain a residue, which was then applied to a silica gel column, and eluted with a mixture of methylene chloride/methanol (90:10) to obtain diastereomers R15a (700 mg; yield 55.1%) and R15b (220 mg; yield 17.3%) of the desired compound.

Provenance & Evidence