Diketene → N-(2-bornyl)-acetylacetamide
Reaction equation
[CH2:1]=[C:2]1[O:6][C:4](=[O:5])[CH2:3]1.[C:7]12([CH3:17])[C:13]([CH3:15])([CH3:14])[CH:10]([CH2:11][CH2:12]1)[CH2:9][CH:8]2[NH2:16]>C(OC(C)C)(C)C>[C:7]12([CH3:17])[C:13]([CH3:14])([CH3:15])[CH:10]([CH2:11][CH2:12]1)[CH2:9][CH:8]2[NH:16][C:4](=[O:5])[CH2:3][C:2](=[O:6])[CH3:1]Participants
Reactant 2
Product 1
Reagents, catalysts & solvents 1
Conditions
- Temperature
- 20 °C
Procedure
16.8 g of diketene were added with stirring to a mixture of 30 g of 2-bornylamine and 200 ml of isopropyl ether and after stirring for 4 hours at 20° C., the mixture was evaporated to dryness under reduced pressure. The residue was chromatographed over silica gel and elution with a 9-1 methylene chloride-acetone mixture gave 39 g of N-(2-bornyl)-acetylacetamide. 30 g of the latter product and 1 g of p-toluene sulfonic acid were added to a mixture of 20 g of methyl orthoformate and 30 ml of methanol and the mixture stood at 20° C. for 16 hours. 2 ml of quinoline were added thereto and the mixture was evaporated to dryness under reduced pressure. The residue was added to toluene and the mixture was heated at 145° C. for 3 hours while distilling a toluene-methanol azeotrope. The mixture was evaporated to dryness under reduced pressure and the residue was chromatographed over silica gel. The product was eluted with an 8-2 methylene chloride-acetone mixture and was crystallized from isopropyl ether to obtain 19 g of N-(2'-bornyl)-3-methoxy-crotonamide melting at 149° C. The RMN spectra showed it was the E somer.
Workup
- customthe mixture was evaporated to dryness under reduced pressure
- customThe residue was chromatographed over silica gel and elution with a 9-1 methylene chloride-acetone mixture
Sources & evidence
- ORD record
- ord-ed8083d187034f8cb39439ab6c6f68ce
- Source dataset
- uspto-grants-1979_10
- Patent number
- US04170465
Reaction notes
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