Abstract
AbstractDescribed here is a practical carbocation‐initiated formal [3+2] or [4+2] cycloaddition reaction for the diversity‐oriented syntheses of 1‐amidoindenes and 2‐amido‐4H‐chromenes. The Lewis acid‐promoted annulation of ynamides and benzyl silyl ethers efficiently constructs 1‐amidoindenes via CH functionalization of benzyl silyl ethers. By utilization of o‐methoxybenzyl silyl ethers, 2‐amido‐4H‐chromenes are also constructed via CO bond cleavage of benzyl silyl ethers.magnified image
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