Diphenylsilane → (S)-tert-butyl 3-((diethylamino)methyl)morpholine-4-carboxylate

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To a solution of (S)-tert-butyl 3-((N-ethylacetamido)methyl)morpholine-4-carboxylate (INTERMEDIATE 86A, Step 2, 0.04 g, 0.14 mmol) and diphenylsilane (0.052 ml, 0.28 mmol) in tetrahydrofuran (1.345 ml) at rt was added carbonyltris(triphenylphosphine)rhodium(I)hydride (6.42 mg, 6.98 mol). After a brief surge of gas evolution, the now yellow reaction was stirred for 30 min and then quenched with 1N aqueous hydrogen chloride. The mixture was extracted with ether, and the aqueous layer was basified with 50% aqueous sodium hydroxide. The aqueous layer was the extracted with ethyl acetate (×4), and the combined organic layers were dried over sodium sulfate, filtered, and concentrated under reduced pressure to afford (S)-tert-butyl 3-((diethylamino)methyl)morpholine-4-carboxylate (0.038 g, yield: almost quantitative) (INTERMEDIATE 86A, Step 3).

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