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This strategy is considered one of the best routes to vitamin D analogs because it provides in one step the vitamin D triene unit under mild conditions. This approach presents, however, a few disadvantages namely: (a) the preparation of small quantities of up to 50mg of compound that requires an excess of the phosphine oxide (A-ring fragment); (b) the multistep preparation of the phosphine oxide required for coupling with the upper ketone (CD-side chain fragment), and (c) the low yield obtained in the formation of the triene unit when some C-ring or A-ring substituted fragments are used. For details, see
-
This strategy is considered one of the best routes to vitamin D analogs because it provides in one step the vitamin D triene unit under mild conditions. This approach presents, however, a few disadvantages namely: (a) the preparation of small quantities of up to 50mg of compound that requires an excess of the phosphine oxide (A-ring fragment); (b) the multistep preparation of the phosphine oxide required for coupling with the upper ketone (CD-side chain fragment), and (c) the low yield obtained in the formation of the triene unit when some C-ring or A-ring substituted fragments are used. For details, see:.
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-
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Sigmatropic rearrangement of vinylallenes: a novel route to the 1-hydroxyvitamin D system
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This interesting route to vitamin D analogs is based on the thermal isomerization of a vinyallene triene system to produce the vitamin D triene through a thermal suprafacial [1,5]-sigmatropic hydrogen shift. This approach cannot be applied to the synthesis of analogs that are unstable or easily isomerizes to the corresponding previtamins. The synthetic potential of this route to prepare new vitami
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Hammond M.L., Mouriño A., Okamura W.H. Sigmatropic rearrangement of vinylallenes: a novel route to the 1-hydroxyvitamin D system. J. Am. Chem. Soc. 1978, 100:4907-4908. This interesting route to vitamin D analogs is based on the thermal isomerization of a vinyallene triene system to produce the vitamin D triene through a thermal suprafacial [1,5]-sigmatropic hydrogen shift. This approach cannot be applied to the synthesis of analogs that are unstable or easily isomerizes to the corresponding previtamins. The synthetic potential of this route to prepare new vitamin D analogs have not yet been explored. For details, see:.
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(1978)
J. Am. Chem. Soc.
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Hammond, M.L.1
Mouriño, A.2
Okamura, W.H.3
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A convenient synthesis of mono- and polyhalogenated benzocyclanones
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Cornelius L., Combs D. A convenient synthesis of mono- and polyhalogenated benzocyclanones. Synth. Commun. 1994, 24:2777-2788.
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(1994)
Synth. Commun.
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Cornelius, L.1
Combs, D.2
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71
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33748805474
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Efficient synthesis of functionalized organozinc compounds by the direct insertion of zinc into organic iodides and bromides
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Krasovskiy A., Malakhov V., Gavryushin A., Knochel P. Efficient synthesis of functionalized organozinc compounds by the direct insertion of zinc into organic iodides and bromides. Angew. Chem. Int. Ed. 2006, 45:6040-6044.
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(2006)
Angew. Chem. Int. Ed.
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Krasovskiy, A.1
Malakhov, V.2
Gavryushin, A.3
Knochel, P.4
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