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, 8-diazobicyclo[5.4.0]undec-7-ene (15 ml), 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): δ 0.71 (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