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12344315990
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This paper is "Synthetic Studies on Indoles and Related Compounds 54": Part 53: "A Total Synthesis of 1-Methoxycanthin-6-one: An Efficient One-Pot Synthesis of the Canthin-6-one Skeleton from β-Carboline-1-carbaldehyde" H. Suzuki, M. Adachi, Y. Ebihara, H. Gyoutoku, H. Furuya, Y. Murakami, and H. Okuno Synthesis 2005 28 32
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Synthesis
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Suzuki, H.1
Adachi, M.2
Ebihara, Y.3
Gyoutoku, H.4
Furuya, H.5
Murakami, Y.6
Okuno, H.7
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2
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85030796766
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note
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Current address: Faculty of Pharmaceutical Sciences, Chiba Institute of Science, 3 Shiomi-cho, Choshi, Chiba 288-0025, Japan
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85030804780
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2-EtOAc (1:1) as a solvent system to afford the product (7) shown in Table 1
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36
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85030795169
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2-EtOAc (1:1) as a solvent system to afford the product (8) shown in Table 2
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85030793890
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2-MeOH (10:1) as a solvent system to afford the product (10) shown in Table 3
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85030798663
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One-pot procedure for 10a from 7a: To a stirred solution of compound (7a) (38.6 mg, 0.108 mmol) in 1,1,2,2-tetrachloroethane (2.0 mL), borontrifluoride etherate (0.36 mL, 2.9 mmol) was added at 0°C under argon atmosphere, and then the reaction mixture was heated to 120°C for 2 h. To the reaction mixture, dimethoxypropane (0.2 mL, 1.6 mmol) was added at 120°C, and heated at 120°C for 1 h. The reaction mixture was worked up as described above to afford the product (10a, 16.5 mg) in 77% yield
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39
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85030797345
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note
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-1: 3345, 3255, 1595
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40
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85030803899
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note
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-1: 3388, 1660
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41
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85030802249
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note
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-1: 3447
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