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note
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3-mediated cyclization conditions gave a mixture of unidentified products.
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67
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33644961571
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note
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Cyclized products 8, 14, and the enantiomers of 21 and 22 were previously prepared by our group, see refs 1c, d and 5f.
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0033534507
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(a) Ohno, H.; Toda, A.; Miwa, Y.; Taga, T.; Fujii, N.; Ibuka, T. Tetrahedron Lett. 1999, 40, 349-352.
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69
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(b) Ohno, H.; Toda, A.; Fujii, N.; Takemoto, Y.; Tanaka, T.; Ibuka, T. Tetrahedron 2000, 56, 2811-2820.
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Ohno, H.1
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note
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The lower reactivity of 18 and 20 will be an influence of the Mts group: the aryl group of Mts will direct the opposite side to the isopropyl group at the α position, which may cause an unfavorable steric interaction to the alkyl group on the allenyl carbon on cyclization. However, the exact reason for their lower reactivity is unclear.
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