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14
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38849177721
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1H-NMR ratio of their (R)-MαNP esters, which was synthesized by esterification of the C15-primary hydroxy group in dichotomine C (1) with pivaloyl chloride, followed by treatment of the C14-secondary hydroxy group with (R)-2-methoxy-2-(1-naphthyl)propionic acid (MαNP acid) in the presence of dicyclohexylcarbodiimide and dimethylaminopyridine.
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1H-NMR ratio of their (R)-MαNP esters, which was synthesized by esterification of the C15-primary hydroxy group in dichotomine C (1) with pivaloyl chloride, followed by treatment of the C14-secondary hydroxy group with (R)-2-methoxy-2-(1-naphthyl)propionic acid (MαNP acid) in the presence of dicyclohexylcarbodiimide and dimethylaminopyridine.
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15
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38849166913
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Although DMSO-d6 as the measurement solvent for the 1H-NMR spectrum of natural, -dichotomine C (1) was described in ref. 1, the 1H-NMR spectrum data of synthetic, )-1 by DMSO-d6 were not identical with those of natural, )-1: 1H-NMR (300 MHz, DMSO-d6) d, 3.77-3.87 (2H, m, 3.89 (3H, s, 4.83 (1H, t, J=5.9 Hz, 5.04-5.12 (1H, m, 5.91 (1H, d, J=4.4 Hz, 7.27 (1H, t, J=7.3 Hz, 7.56 (1H, t, J=7.3 Hz, 7.72-7.76 (1H, m, 8.35 (1H, d, J=7.3 Hz, 8.82 (1H, s, 11.61 (1H, s, The 1H-NMR spectrum of synthetic, )-1 was measured again in pyridine d6 by the corrected information from Professor M. Yoshikawa
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6 by the corrected information from Professor M. Yoshikawa.
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