Abstract
Schiff bases derived from tryptophan methyl ester react with differently substituted electron-rich siloxy dienes in the presence of achiral or chiral boric acid esters to give enaminones 5 and 6 with high diastereomer ratios (up to >98:2). These intermediates are converted into highly functionalized indoloquinolizines 14 and 15 by means of a new method which employs the transformation of vinylogous amides to vinylogous chloromethyl amines and their subsequent conversion to vinylogous imidoyl chlorides as the key step.
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