Water → 2-Benzyloxymethyl-8-phenethyl-1,4-dioxa-8-azaspiro[4,5]decane

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2-hydroxymethyl-8-phenethyl-1,4-dioxa-8-azaspiro[4,5]decane (compound 1, 50 gm, 0.18 mole) was dissolved in toluene (250 ml) at room temperature. 10 gm of 60% of sodium hydride in toluene (300 ml) was added to the above solution until the effervescence ceased. 2 gram of phase transfer catalyst tetrabutylammonium bromide (TBAB) was added. Benzyl chloride, 23 gm was then added drop wise to the above reaction mass and the reaction was maintained at 58° C. for 15 hrs. The reaction mass was poured into water and organic layer was separated. Toluene was removed under reduced pressure to get a thick reddish brown liquid. The yield is 84%.

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