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1
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Scheme 6. g-Addition of hetero groups to diene O,N-acetal 9a.
7.1 Hz, 2H), 5.16 (s, 2H), 6.89 (d, J = 15.4 Hz, 1H), 7.21 (dt, J =
15.4 Hz, 6.9 Hz, 1H), 7.34–7.95 ppm (m, 11H); 13C NMR (CDCl3,
100 MHz): d = 26.7, 36.6, 67.9, 122.0, 128.0, 128.4, 128.7 (C 2), 133.3,
134.3, 134.9, 136.6, 149.5, 151.5, 165.5, 198.1 ppm; IR (polymer): n˜ =
3292, 1764, 1687, 1648, 1523, 1204, 1049, 746, 698 cmÀ1; HRMS: calcd
for C20H19NO4: 337.1314, found: 337.1324.
Received: May 28, 2004
Keywords: alkenes · alkylation · carboxylic amides · radicals ·
.
synthetic methods
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Angew. Chem. Int. Ed. 2004, 43, 5378 –5380