Methyl 3-butenoate → (E)-Methyl 7-(2,3-diphenyl-7,8-dihydropyrido[3,2-b]pyrazin-5(6H)-yl)hept-3-enoate

Beteiligte Stoffe

Reaktionsschritte

To a solution of 5-(pent-4-enyl)-2,3-diphenyl-5,6,7,8-tetrahydropyrido[3,2-b]pyrazine (step 1) (200 mg, 0.563 mmol) and methyl but-3-enoate (225 mg, 2.251 mmol) in DCM (300 ml) was added Grubbs Catalyst second generation (5 mol %, 23.88 mg, 0.028 mmol). The reaction was stirred at RT under an atmosphere of nitrogen overnight. An additional portion of Grubbs Catalyst second generation (5 mol %, 23.88 mg, 0.028 mmol) was added and stirring continued for 2.5 h. The solvent was removed in vacuo and the resulting crude was purified by chromatography on silica eluting with EtOAc/iso-hexane to afford the title compound;

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