A facile method of synthesizing 8-oxoprotoberberines is described from 6-benzoyl-5,6,7,8-tetrahydro-[1,3]dioxolo[4,5-g]isoquinoline-5-carbaldehyde via acidmediated cyclization or from 2-(2-iodophenethyl)isoquinolin-1(2H)-one via the Heck reaction. The present method offers several advantages, such as good yields and a simple procedure.
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