Sulfuric acid magnesium salt (1:1) → 6,11-DIHYDRO-11-(4-PIPERIDINYL)-5H-BENZO[5,6]CYCLOHEPTA[1,2-b]PYRIDINE

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Reaction Steps

To a solution 66.27 g (0.21 mole) of 4-(8-chloro-5,6-dihydro-11H-benzo[5,6]cyclohepta(1,2-b]pyridin-11-ylidene)-piperidine (product from Preparative Example 1 Example, step G), in THF (1L) was added lithium aluminum hydride (24.32 g, 0.64 mole) and the reaction mixture was heated to reflux overnight. The reaction mixture was then cooled to room temperature and ˜3L of diethyl ether is added followed by dropwise addition of saturated sodium sulfate until a white gray precipitate forms. MgSO4 was then added to the separated organic layer and stirred for 30 minutes. All the volatiles were then removed and the resulting crude mixture was chromatographed on a silica gel column eluting with 10% MeOH saturated with ammonia in CH2Cl2. The material obtained contained both the desired compound and the des-chloro compound. Separation on HPLC using reverse phase column and eluting with 40% MeOH-water afforded the desired compounds as white solids (Product A's mp=95.2-96.1° C., Product B's mp=145.1-145.7° C.).

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