反应详情

A mixture of 3-methoxybenzaldehyde (10.0 g, 73.4 mmol), 1,4-dioxa-8-azaspiro[4.5]decane (10.5 g, 73.4 mmol), sodium triacetoxyborohydride (20.2 g, 95.3 mmol), and acetic acid (4.2 mL), in methylene chloride (400 mL), was stirred at ambient temperature. After 19 h, a 2 N aqueous sodium carbonate solution (220 mL) was added portionwise. After stirring for 15 min, the aqueous layer was separated and extracted with methylene chloride (100 mL). The combined organic layers were washed with brine (100 mL), dried over sodium sulfate and concentrated in vacuo to provide 8-(3-methoxybenzyl)-1,4-dioxa-8-azaspiro[4.5]decane (18.3 g, 95%) as a yellow oil: 1H NMR (CDCl3, 500 MHz) δ 7.25-7.19 (m, 1H), 6.91-6.89 (m, 2H), 6.80-6.77 (m, 1H), 3.94 (s, 4H), 3.80 (s, 3H), 3.50 (s, 2H), 2.53-2.49 (m, 4H), 1.76-1.72 (m, 4H).

1. customthe aqueous layer was separated
2. extractionextracted with methylene chloride (100 mL)
3. washThe combined organic layers were washed with brine (100 mL)
4. dry with materialdried over sodium sulfate
5. concentrationconcentrated in vacuo