Hydrazine hydrate (1:1) → 6,7,8,9-Tetrahydropyridazino[4,5-b]indolizin-1(2H)-one

Participants

Reaction Conditions

Reaction Steps

A 100-mL single-neck round-bottomed flask equipped with a reflux condenser was charged with 193d (600 mg, 2.9 mmol) and hydrazine hydrate (20 mL). The reaction mixture was heated at 100° C. for 4 hours. After this time the reaction was cooled to room temperature and filtered to afford 193e as a yellow solid (413 mg, 75%). MS-ESI: (M+H)+ 190.1. 1H NMR (500 MHz, DMSO-d6) δ 12.17 (s, 1H), 8.24 (s, 1H), 6.33 (s, 1H), 4.16 (t, J=6.0 Hz, 2H), 2.88 (t, J=6.5 Hz, 2H), 2.00-1.96 (m, 2H), 1.84-1.79 (m, 2H).

Provenance & Evidence