New Diels-Alder reactions of (E/Z)-2'-methoxy-substituted 3-vinylindoles with carbo- and heterodienophiles: regio- and stereoselective access to [b]-annelated indoles and functionalized or [a]-annelated carbazoles
摘要:
The (E/Z)-2'-methoxy-substituted 3-vinylindoles 1a,b react with some carbo- and azodienophiles to furnish new carbazoles and pyridazinoindoles. The conservation of the E and Z stereochemistry of 1 in these Diels-Alder reactions was investigated, and a mechanistic rationalization is given for the stereoselective and regioselective results observed.