[4-(1H-indol-3-ylmethylene)-5-oxo-1-phenyl-4,5-dihydro-2,3,6,10b-tetraaza-benzo[e]azulen-6-yl]-acetic acid tert-butyl ester → [4-(1H-indol-3-ylmethyl)-5-oxo-1-phenyl-4,5-dihydro-2,3,6,10b-tetraaza-benzo[e]azulen-6-yl]-acetic acid tert-butyl ester

Participants

Reaction Steps

Following the procedure described for Example 1(A), Step B, [4-(1H-indol-3-ylmethylene)-5-oxo-1-phenyl-4,5-dihydro-2,3,6,10b-tetraaza-benzo[e]azulen-6-yl]-acetic acid tert-butyl ester (4.84 g, 9.37 mmol) was reduced in EtOH (150 mL) for 3 hours at 80° C. The residue was dissolved in EtOAc and was washed with aqueous NH4Cl (1×) and brine (1×). The organic solution was dried (Na2SO4), filtered and concentrated to provide 4.26 g of [4-(1H-indol-3-ylmethyl)-5-oxo-1-phenyl-4,5-dihydro-2,3,6,10b-tetraaza-benzo[e]azulen-6-yl]-acetic acid tert-butyl ester. 1H NMR (DMSO-d6) δ 7.65 (d, 1H), 7.53-7.38 (m, 7H), 7.27 (m, 1H), 7.18 (m, 2H), 6.98 (m, 1H), 6.89 (m, 2H), 4.75 (d, 1H), 4.43 (d, 1H), 3.82 (t, 1H), 3.59 (m, 2H), 1.22 (s, 9H).

Provenance & Evidence