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semisolid (yield: 214 mg, 0.48 mmol, 83%), with imine 4a’
(yield: 11%) in minor proportions. 4a: H NMR (400 MHz,
[7] 1,1,-Diamino-1,3-diene species III might alternatively
undergo Povarov reactions with imines; see selected
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1
CDCl3): d=7.25 ~7.17 (m, 7H), 7.06 ~6.99 (m, 3H), 6.74
(dd, J=8.3, 1.0 Hz, 2H), 6.60 (t, J=6.5 Hz, 1H), 6.45 (d, J=
7.7 Hz, 2H), 5.91 (s, 1H), 4.40 (dd, J=9.5, 4.9 Hz, 1H), 4.32
(s, 1H), 3.28 (s, 3H), 3.03 (s, 3H), 2.39–2.28 (m, 2H), 1.50
(s, 3H); 13C NMR (150 MHz, CDCl3): d=154.2, 148.3, 146.8,
143.3, 141.7, 128.9, 128.7, 127.1, 125.9, 123.5, 121.0, 120.9,
117.3, 113.3, 55.4, 48.3, 40.2, 34.3, 18.3; ESI-MS: m/z=
447.1978, calcd. for C26H29N3O2S: 447.1980.
[9] CCDC 1430744 (4k), CCDC 1430745 (5i), CCDC
1430743 (5e), and CCDC 1430746 (5k) contain the sup-
plementary crystallographic data for this paper. These
data can be obtained free of charge from The Cam-
Acknowledgements
The National Science Council, Taiwan, supported this work.
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Adv. Synth. Catal. 2016, 358, 1421 – 1427