3-Pyridinemethanol → (r)-2-(3-Chloro-4-(3-pyridinylmethoxy)benzyl)morpholine

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Reaction Steps

N-BOC-(R)-2-(3-chloro-4-hydroxybenzyl)morpholine, example 7, intermediate (a) (53 mg, 0.16 mmol), was dissolved in dichloromethane (4 mL) with 3-pyridinyl carbinol (35 mg, 0.32 mmol) shaken at room temperature for 20 mins and diisopropylazodicarboxylate (65 mg, 0.32 mmol) added in one portion. dichloromethane (6 mL) was added to solvate the polymer. The reaction mixture was shaken for 24 hrs then filtered. Polymer supported toluenesulfonyl chloride (0.18 g, 2.82 mmol/g) and MP-carbonate (0.39 g, 2.62 mmol/g) were added to the liquor and the mixture shaken for 6 hrs. The reaction was filtered and evaporated under a high flow of nitrogen. The crude residue was dissolved in TFA (20% v/v solution in dichloromethane, 2.0 mL) and shaken for 3 hrs at room temperature. The reaction mixture was added directly to an SCX-2 column (2 g) and washed with dichloromethane (2 mL×2) and methanol (2 mL×2). The SCX-2 column was then washed with ammonia (2N in methanol, 3×2 mL). Combined ammonia washes were concentrated in vacuo and the residue purified by preparative HPLC to yield the desired morpholine example 44 as a colorless oil (9 mg).

Provenance & Evidence