7-Chloromethyl-1,4-dichloro-isoquinoline → 4-chloro-7-(hydroxymethyl)-1(2H)-isoquinolone

Participants

Reaction Steps

7-(Chloromethyl)-1,4-dichloro-isoquinoline ##STR186## LiBH4 (530 mg, 24.3 mmol) was added portionwise to a stirred solution of ethyl 4-chloro-1-oxo-1,2-dihydro-7-isoquinolinecarboxylate (3.06 g, 12.2 mmol) in THF (100 mL) and the mixture was stirred at room temperature for 1 h. The heterogeneous mixture was quenched with dilute HCl (2 M), and extracted with CH2Cl7 (2×100 mL) and EtOAc (5×100 mL). The remaining solid was taken up in hot EtOH, and allowed to cool to yield a white fluffy solid. This solid was combined with the combined organic extracts, evaporated in vacuo and crystallised with EtOH to give 4-chloro-7-(hydroxymethyl)-1(2H)-isoquinolone (2.19 g, 10.49 mmol) as a white solid.

Provenance & Evidence