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85033151623
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note
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3 gave a mixture of O- and N-cyclized products in a ratio of 2:1.
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0031013358
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Preliminary communication of this work: Kitagawa, O.; Fujita, M.; Li, H.; Taguchi, T. Tetrahedron Lett. 1997, 38, 615.
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Kitagawa, O.1
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0030527155
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4-mediated iodocarbocyclization reaction of alkenylmalonate derivatives and its asymmetric catalysis. Kitagawa, O.; Inoue, T.; Taguchi, T. Rev. Heteroat. Chem. 1996, 15, 243.
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Kitagawa, O.1
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19
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85033143484
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Ethoxycarbonyl isocyanate was purchased from Aldrich Co
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Ethoxycarbonyl isocyanate was purchased from Aldrich Co.
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-
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20
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0028967188
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(a) Maligres, P. E.; Upadhyay, V.; Rossen, K.; Cianciosi, S. J.; Purick, R. M.; Eng, K. K.; Reamer, R. A.; Askin, D.; Volante, R. P.; Reider, P. J. Tetrahedron Lett. 1995, 36, 2195.
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85033146036
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note
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3, the reaction hardly proceeded resulting in the recovery of 2f.
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24
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0020407132
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85033136438
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note
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Although we also investigated 1,2-asymmetric induction in the reaction of an O-allyl carbamate or urea with a chiral center at the allylic position, high stereoselectivity could not be achieved.
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26
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0029953198
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85033130772
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note
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The use of n-BuLi gave 2j with similar high cis-selectivity without formation of dealkoxycarbonylated product 4j (70%, cis-2j/trans-2j = 24).
-
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-
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28
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0000535305
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