Synthesis of Isoquinoline Derivatives via Palladium‐Catalyzed C−H/C−N Bond Activation of
<i>N</i>
‐Acyl Hydrazones with
<i>α</i>
‐Substituted Vinyl Azides
A palladium‐catalyzed cyclization of N‐acetyl hydrazones with vinyl azides has been developed. Various substituted isoquinolines, including diverse fused isoquinolines can be prepared via this protocol in moderate to good yields. Mechanistic studies suggest that α‐substituted vinyl azide serves as an internal nitrogen source. Also, C−H bond activation and C−N bond cleavage have been realized using
Selectivity in vinyl azide reactions; decomposition of azidocinnamates with olefinic ortho-substituents
作者:Deirdre M. B. Hickey、Christopher J. Moody、Charles W. Rees
DOI:10.1039/c39820001419
日期:——
Thermal decomposition of vinylazides (1a–c) gives isoquinolines (3), benzazepines (4), or aziridines (5) and (6) by preferential reaction at the unsaturated substituent; removal of this unsaturation as in the epoxides (1d,1e) leads exclusively to 4-substituted indoles.