Acetic Acid → 4-(1,4-Dioxaspiro[4.5]decan-8-yl)morpholine

A mixture of 1,4-dioxaspiro[4.5]decan-8-one (10.0 g, 64.0 mmol), morpholine (20 mL) and AcOH (1.0 mL) was stirred for 2.5 h. Sodium cyanoborohydride (8.05 g, 128.0 mmol) was then added in one portion followed by more morpholine (15 mL). An exothermic reaction occurred and the mixture was cooled for 2 min with an ice-bath. Then the mixture was stirred at room temperature for 16 h. Ethanol (120 mL) and water (28 mL) were added to the resulting thick slurry and the white solid filtered, washed with ethanol (2×) and the filtrate concentrated. EtOAc was then added, the precipitate filtered off, washed with EtOAc and the filtrate concentrated. The residual oil was purified by Kugelrohr distillation to give 7 (9.03 g, 62%; b.p.140° C./0.05 mmHg) as a clear oil which solidifies on standing.

1. customAn exothermic reaction
2. temperaturethe mixture was cooled for 2 min with an ice-bath
3. stirringThen the mixture was stirred at room temperature for 16 h
4. filtrationthe white solid filtered
5. washwashed with ethanol (2×)
6. concentrationthe filtrate concentrated
7. additionEtOAc was then added
8. filtrationthe precipitate filtered off
9. washwashed with EtOAc
10. concentrationthe filtrate concentrated
11. distillationThe residual oil was purified by Kugelrohr distillation
12. customto give 7 (9.03 g, 62%; b.p.140° C./0.05 mmHg) as a clear oil which

ORD record

ord-d6749fd7c49447e8a06f58f90cb280aa

Source dataset

uspto-grants-2012_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08178552B2