Nitrogen → HCID 57079368, compound

Participants

Reaction Steps

A mixture of methyl 7-methyl-3-oxochola-4,6-dien-24-oate (9) (0.62 g, 1.56 mmoles), 5% palladium on carbon (72 mg), 1,8diazobicyclo-[5.4.0]undec-7-ene (15 gl), cyclohexene (4.9 ml) and ethanol (3.6 ml) was heated under reflux in an N2 for 6 hrs. The cooled mixture was filtered, and the catalyst washed with ethanol (4 times). The combined filtrate and washes were evaporated in vacuo. The residue was dissolved in EtOAc (30 ml), washed with 0.5M HCl, H2O, saturated brine and dried (MgSO4). Evaporation in vacuo gave 0.62 g of pure 10 as a pale yellow syrup. NMR (CDCl3): δ0.71 (s, 3H, 18-Me); 0.94 (d, 3H, 20-Me); 1.05 (d, 3H, 7-Me); 1.15 (s, 3H, 19-Me); 3.66 (s, 3H, CO2Me); 5.70 (s, 1H, 4-H).

Provenance & Evidence