Catalytic Enantioselective Approaches to the oxa-Pictet–Spengler Cyclization and Other 3,6-Dihydropyran-Forming Reactions

Abstract

This Short Review provides an analysis of the state-of-the-art in catalytic enantioselective oxa-Pictet–Spengler cyclizations. Also discussed are other catalytic reactions providing access to enantio­enriched isochromans and tetrahydropyrano[3,4-b]indoles. Context is provided and remaining challenges are highlighted.

Key words

oxa-Pictet–Spengler cyclization - isochromans - tetrahydropyrano[3,4-b]indoles - oxocarbenium ions - asymmetric catalysis - ion pairing

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