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6
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85088755365
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note
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5 (see Supporting Information).
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8
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0347495062
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note
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While the structure of 1 or 2 was confirmed by extensive analysis of 2D NMR data except for the location of substructure b in the side chain, the structural assignment of 4 was carried out by FAB-MS data, which was in full agreement with FAB-MS/MS data.
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9
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0025790925
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Kusumi, T.1
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Kakisawa, H.4
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10
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0000953504
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Riguera, R.4
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11
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0346234076
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note
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This assignment was consistent with the CD spectrum of 1, which gave a positive Cotton effect at 270 nm. The CD spectra of this class of compounds are dependent on the conformation of the central six-membered ring; our analysis of the conformation of 1 and its CD spectrum was in agreement with a closely related compound 11 in ref 12.
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13
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2142858450
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Othani, I.; Kusumi, T.; Kashman, Y.; Kakisawa, H. J. Am. Chem. Soc. 1991, 113, 4092-4096.
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Othani, I.1
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Kakisawa, H.4
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14
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0028263686
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Fujimoto, Y.; Murasaki, C.; Shimada, H.; Nishioka, S.; Kakinuma, K.; Singh, S.; Singh, M.; Gupta, Y. K.; Sahai, M. Chem. Pharm. Bull. 1994, 42, 1175-1184.
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Fujimoto, Y.1
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Kakinuma, K.5
Singh, S.6
Singh, M.7
Gupta, Y.K.8
Sahai, M.9
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15
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0346864491
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note
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13C NMR data for model compounds corresponding to C-2 to C-5 and C-1″ were as follows.15 Inconsistency of chemical shifts for C-17′ and C-18′ between 7 and the 14′R*, 17′S*, 18′S* isomer may be due to γ (Δδ -2.5) and δ (+0.3) effects by a methyl substitute at C-20′, 14′R*, 17′S*, 18′S* isomer [δ 79.3 (C-14′), 32.4 (C-15′), 28.4 (C-16′), 81.9 (C-17′), 74.2 (C-18′)], 14′S*, 17′S*, 18′S* isomer [δ 79.9 (C-14′), 31.4 (C-15′), 27.8 (C-16′), 82.2 (C-17′), 74.5 (C-18′)], 14′R*, 17′S*, 18′R* isomer [δ 80.2 (C-14′), 32.3 (C-15′), 25.0 (C-16′), 81.5 (C-17′), 72.0 (C-18′)], 14′R*, 17′R*, 18′R* isomer [δ 79.6 (C-14′), 31.4 (C-15′), 23.9 (C-16′), 82.1 (C-17′), 71.6 (C-18′)].
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17
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0037015426
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Eguchi, T.; Kobayashi, K.; Uekusa, H.; Ohashi, Y.; Mizoue, K.; Matsushima, Y.; Kakinuma, K. Org. Lett. 2002, 4, 3383-3386.
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Eguchi, T.1
Kobayashi, K.2
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Matsushima, Y.6
Kakinuma, K.7
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18
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0027973655
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Oikawa, H.1
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Ichikawa, A.4
Kohmoto, K.5
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19
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0347495061
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note
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The 11bS-configuration was consistent with the CD spectrum of 2.11.12
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20
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0348125065
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note
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Because of a limited amount of 3, its degradation studies were not performed.
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21
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0025978317
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0033574468
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Ohba, M.1
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Fujii, T.4
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