Abstract
A three-step synthesis of anti-amoebic, ring-fused mackinazolinones has been developed. A Mannich-type reaction between quinazolin-4-ones and N-Cbz propanal in the presence of AgOTf afforded quinazolinones (19-94% isolated yield) bearing a newly formed heterocycle with an alkylamine appendage that, upon N-Cbz deprotection and basification, triggered a domino rearrangement to afford 45 separable, ring-fused products. Several compounds inhibited growth of Naegleria fowleri parasites that can cause a lethal human brain infection. Thus, the methodology provides immediate access to a promising anti-amoebic scaffold.
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