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HELVETICA CHIMICA ACTA – Vol. 88 (2005)
yellow needles. M.p. 237–2388. IR: 1711s (C=O, ester); 1622s (C=O, ketone); 1523, 1477, 1443, 1404 (s–m,
C=C, C=N(arom.)); 1252, 1136s (CÀOÀC); 2952w (CÀH(aliph.)); 429s (CÀCl). 1H-NMR (CDCl3)1): 10.12–
10.10 (d, J=7.6, HÀC(4)); 8.24–8.22 (d, J=8.4, 2 H, HÀC(10)); 7.99 (s, HÀC(6)); 7.80–7.78 (d, J=8.4, 2 H,
HÀC(2’)); 7.57–7.55 (d, J=7.6, HÀC(3)); 7.53–7.48 (m, 4 H, HÀC(11), HÀC(3’)); 3.97 (s, COOMe). 13C-
NMR (CDCl3)1): 184.38 (C(8)=O); 163.43 (COOMe); 156.90 (C(2)); 144.86 (C(7a)); 138.42 (C(1’)); 137.85
(C(9)); 137.14 (C(12)); 136.24 (C(4)); 134.67 (C(4’)); 131.01 (C(6)); 130.36 (C(2’)); 129.80 (C(3’)); 129.23
(C(10)); 128.92 (C(11)); 119.04 (C(7)); 107.53 (C(3)); 105.85 (C(5)); 51.72 (Me). Anal. calc. for C22H14Cl2N2-
O3 (425.27): N 6.59; found: N 6.51.
Note. The synthesis of compounds 3c and 5c, as well as of 11a and 12a were published in [17] and [15], resp.
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Received June 27, 2005