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Ihara, M.; Yasui, K.; Taniguchi, N.; Fukumoto, K. Heterocycles, 1990, 31, 1017-1020. Ihara, M.; Takahashi, M.; Taniguchi, N.; Yasui, K.; Niitsuma, H.; Fukumoto, K. J. Chem. Soc. Perkin Trans. 1, 1991, 525-535.
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37049087808
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Ihara, M.; Yasui, K.; Taniguchi, N.; Fukumoto, K. Heterocycles, 1990, 31, 1017-1020. Ihara, M.; Takahashi, M.; Taniguchi, N.; Yasui, K.; Niitsuma, H.; Fukumoto, K. J. Chem. Soc. Perkin Trans. 1, 1991, 525-535.
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Ihara, M.1
Takahashi, M.2
Taniguchi, N.3
Yasui, K.4
Niitsuma, H.5
Fukumoto, K.6
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0002447983
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Okada, K.; Katsura, T.; Tanino, H.; Kakoi, H.; Inoue, S. Chemistry Lett. 1994, 157-160. Okada, K.; Murakami, M.; Tanino, H.; Kakoi, H.; Inoue, S. Heterocycles, 1996, 43, 1735-1750 and see ref.4.
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0001577212
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Okada, K.; Katsura, T.; Tanino, H.; Kakoi, H.; Inoue, S. Chemistry Lett. 1994, 157-160. Okada, K.; Murakami, M.; Tanino, H.; Kakoi, H.; Inoue, S. Heterocycles, 1996, 43, 1735-1750 and see ref.4.
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Seki, K.; Ohnuma, T.; Oishi, T.; Ban, Y. Tetrahedron Lett. 1975, 723-726. Ban, Y.; Yoshida, K.; Goto, J.; Oishi, T. J. Am. Chem. Soc. 1981, 103, 6990-6992. Ban, Y.; Yoshida, K.; Goto, J.; Oishi, T.; Takeda, E. Tetrahedron, 1983, 39, 3657-3668.
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8
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0019775986
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Seki, K.; Ohnuma, T.; Oishi, T.; Ban, Y. Tetrahedron Lett. 1975, 723-726. Ban, Y.; Yoshida, K.; Goto, J.; Oishi, T. J. Am. Chem. Soc. 1981, 103, 6990-6992. Ban, Y.; Yoshida, K.; Goto, J.; Oishi, T.; Takeda, E. Tetrahedron, 1983, 39, 3657-3668.
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Ban, Y.1
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9
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Seki, K.; Ohnuma, T.; Oishi, T.; Ban, Y. Tetrahedron Lett. 1975, 723-726. Ban, Y.; Yoshida, K.; Goto, J.; Oishi, T. J. Am. Chem. Soc. 1981, 103, 6990-6992. Ban, Y.; Yoshida, K.; Goto, J.; Oishi, T.; Takeda, E. Tetrahedron, 1983, 39, 3657-3668.
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Goto, J.3
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Takeda, E.5
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10
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0028359968
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For the other asymmetric synthesis of aspidospermidine, see: Desmae"le, D.; d'Angelo, J. J. Org. Chem., 1994, 59, 2292-2303.
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Desmaele, D.1
D'Angelo, J.2
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11
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0342321925
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Enantiomeric enrichment of 11 a∼d might be performed at this stage
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Enantiomeric enrichment of 11 a∼d might be performed at this stage.
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12
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0342321924
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note
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3)} obtained from 11a was similar to that of 12 obtained from 11d. Conversion of 11a into 12 in acidic condition should proceed, without loss of the chirality at C5, as follows: 1) aldol type condensation-dehydration, 2) cleavage of C12-C19 bond promoted by protonation to the α,β-unsaturated carbonyl group and 3) recyclization through stable transition state.
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13
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0031592606
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and references cited therein
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Recently, similar acid-catalized cyclization was reported: Mirand, C.; Papa, M.; Cartier, D.; Le'vy, J. Tetrahedron Lett., 1997, 38, 2263-2266 and references cited therein.
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(1997)
Tetrahedron Lett.
, vol.38
, pp. 2263-2266
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Mirand, C.1
Papa, M.2
Cartier, D.3
Le'vy, J.4
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