Boron trifluoride etherate → HCID 178513157, compound

Participants

Reaction Conditions

Reaction Steps

To a screw cap pressure vessel was added the intermediate from Step A (3.22 g, 10.2 mmol), aminoguanidine hydrochloride (1.69 g, 15.3 mmol), methanol (25 mL) and boron trifluoride diethyl etherate (2.6 mL, 20.4 mmol). The reaction solution was heated at 100° C. for 70 minutes. The solution was concentrated and the residue partitioned between EtOAc and aqueous 1N NaOH. The organic phase was washed twice with aqueous 1N NaOH and brine (1×). The organic phase was dried over anhydrous magnesium sulfate, filtered and concentrated to give the indicated compound as a mixture of E, Z hydrazone isomers. 1H NMR (400 MHz, CD3CN): δ 7.54 (d, J=8.4 Hz, 1H); 7.24-7.17 (m, 1H); 7.10 (d, J=2.6 Hz, 1H); 2.68-2.51 (m, 4H). m/z 371 (M+H).

Provenance & Evidence