Full Paper
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100.6 MHz): δ = 17.6 (CH3), 17.9 (CH3), 21.23 (CH3), 21.24 (CH3), 38.4
(NCH3), 39.0 (NCH3), 60.5 (CH2), 61.0 (CH2), 97.1 (CH), 100.4 (CHar),
108.5 (Cq), 110.9 (Cq), 126.3 (CHar), 129.4 (CHar), 130.8 (CHar), 131.7
(CHar), 134.1 (CHar), 134.2 (CHar), 134.9 (CHar), 135.0 (CHar), 140.6
(Cq), 140.80 (CHar), 140.82 (CHar), 157.5 (Cq), 159.5 (Cq), 161.3 (Cq),
161.7 (Cq), 173.3 (Au=C), 173.6 (Au=C), 177.3 (CO) ppm.
C41H40Au2I2N6O4 (1328.55): calcd. C 37.07, H 3.03, N 6.33; found C
37.43, H 3.21, N 6.59.
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General Procedure for the MIC-AuI Catalyzed Indole Formation:
The appropriate gold complex (0.5 mol-%, based on the metal) and
AgBF4 (1 mol-% for complexes 4–5 and 2 mol-% for complex 6)
were charged in a Schlenk flask and dry toluene (3 mL) was added.
After 5 min of stirring, a solution of the aniline derivative (1.0 mmol)
in 1 mL of toluene was added to the reaction mixture and stirred
at room temperature. At the end of the reaction (followed by 1H
NMR or TLC monitoring), the solvent was removed under pressure.
The crude product was directly purified by column chromatography
on silica gel using hexane/ethyl acetate as mobile phase.
CCDC 1857941 (for 1), 1857942 (for 5), and 1857943 (for F) contain
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Acknowledgments
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Keywords: Chrysin · Coumarin · Gold · Mesoionic
carbenes · Triazolium salts
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