Potassium Hydroxide → 5-Benzyloxy-3-(1-BOC-2-(S)-azetidinylmethoxy)pyridine

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Next, a solution of 3-benzyloxy-5-hydroxypyridine (350 mg, 1.74 mmol, from step 120d) in DMF (20 mL) was treated with ground KOH (154 mg, 2.74 mmol) and stirred for 30 minutes at 80° C. To this mixture was rapidly added the Boc-(S)-toluensulfonyloxymethylazetidine (585 mg, 1.74 mmol) dissolved in DMF (5 mL), and the mixture was stirred for 16 hours at 80° C. The mixture was concentrated under vacuum to remove the DMF, and the residue was diluted with water and extracted with EtOAc. The organic extracts were combined, dried (Na2SO4), filtered, and concentrated under vacuum to give 800 mg of crude product. This material was purified by chromatography (silica gel; hexane/EtOAc, 10:1) to give the title compound (575 mg, 90%): 1H NMR (CDCl3, 300 MHz) δ 1.40 (s, 9H), 2.26-2.30 (m, 2H), 3.90-2.94 (m, 2H), 4.16 (m, 1H), 4.35 (m, 1H), 4.54 (m, 1H), 5.10 (s, 2H), 6.95 (s, 1H), 7.40-7.46 (m, 5H), 8.20 (br s, (2H): MS (CI/NH3) m/z: 371 (M+H)+.

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