Mesoxalic acid → 8-Benzyl-8-azabicyclo(3.2.1)octan-3-one

温度

50 °C

A solution of 2,5-dimethoxytetrahydrofuran (50 g, 378 mmol) in 0.025 M aqueous hydrochloric acid (160 ml) was cooled to 0° C. and stirred for 16 hours. Benzylamine hydrochloride (65 g, 453 mmol), ketomalonic acid (55 g, 377 mmol) and an aqueous solution of sodium acetate (300 ml, 0.69 M) were added and the reaction stirred at room temperature for 1 hour. The mixture was heated to 50° C. for a further 90 minutes then cooled in an ice bath and basified to pH12 with 2 N aqueous sodium hydroxide solution. The layers were separated, and the aqueous phase extracted with ethyl acetate (3×). The combined organic solutions were washed with water, dried (MgSO4), filtered and evaporated under reduced pressure. The residual brown oil was distilled under reduced pressure (126° C./0.4 kPa) to afford the title compound as an off-white solid, 37.81 g.

1. stirringthe reaction stirred at room temperature for 1 hour
2. temperaturethen cooled in an ice bath
3. customThe layers were separated
4. extractionthe aqueous phase extracted with ethyl acetate (3×)
5. washThe combined organic solutions were washed with water
6. dry with materialdried (MgSO4)
7. filtrationfiltered
8. customevaporated under reduced pressure
9. distillationThe residual brown oil was distilled under reduced pressure (126° C./0.4 kPa)

ORDレコード

ord-a96b865394804e97888a20ceefdfd451

出典データセット

uspto-grants-2003_12

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US06667314B2