Benzenesulfinic acid → 5-amino-1-(chloromethyl)-3-((5,6,7-trimethoxyindol-2-yl)carbonyl)-1,2-dihydro-3H-benz(e)indole

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Reaction Steps

Benzenesulfinic acid, sodium salt (25 mg, 0.15 mmol) and camphorsulfonic acid (40 mg, 0.17 mmol) were added to a solution of 10a (30 mg, 0.059 mmol) in dichloromethane (5 mL). Pd(Ph3P)4 (5 mg, 0.004 mmol) was added and the reaction mixture was stirred at an ambient temperature for 30 min. The mixture was purified directly via a silica gel column. Elution with EtOAc/petroleum ether (1:1) gave 1-(chloromethyl)-3-[(5,6,7-trimethoxy-1H-indol-2-yl)carbonyl]-1,2-dihydro-3H-benzo[e]indol-5-amine (11a) (22 mg, 80%), spectroscopically identical to an authentic sample (Atwell et al., J. Org Chem., 1998, 63, 9414).

Provenance & Evidence