Tetrahydrofuran → N-[2-(2,3-Dihydro-1,4-benzodioxin-6-yl)-2-oxoethyl]hexadecanamide

Aminoacetophenone HCl (7.1 g, 31 mmol) and tetrahydrofuran (300 ml) were placed in a 1 liter three-neck round bottom flask with a large stir bar. Sodium acetate (50% in water, 31 ml) was added in three portions to this suspension. Palmitoyl chloride (31 ml, 10% excess, 0.036 mol) in tetrahydrofuran (25 ml) was then added dropwise over 20 min to yield a dark brown solution. This mixture was then stirred for an additional 2 h at room temperature. The resultant mixture was poured into a separatory funnel to remove the aqueous solution. Chloroform/methanol (2/1, 150 ml) was then added to the organic layer and washed with water (50 ml). The yellow aqueous layer was extracted once with chloroform (50 ml). The organic solutions were pooled and rotoevaportated until almost dry. The residue was redissolved in chloroform (100 ml) and crystallized by the addition of hexane (400 ml). The flask was then cooled to 4° C. for 2 h. The crystals were filtered and washed with cold hexane until they were almost white and then dried in a fume hood overnight. The yield of the product was 27 mmol (11.6 g).

1. customto yield a dark brown solution
2. customto remove the aqueous solution
3. additionChloroform/methanol (2/1, 150 ml) was then added to the organic layer
4. washwashed with water (50 ml)
5. extractionThe yellow aqueous layer was extracted once with chloroform (50 ml)
6. customuntil almost dry
7. dissolutionThe residue was redissolved in chloroform (100 ml)
8. customcrystallized by the addition of hexane (400 ml)
9. temperatureThe flask was then cooled to 4° C. for 2 h
10. filtrationThe crystals were filtered
11. washwashed with cold hexane until they
12. customdried in a fume hood overnight

ORD record

ord-999160059dc84cc29593b6193ed410b2

Source dataset

uspto-grants-2005_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06916802B2