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The synthesis of osthenol by the same approach was also published by Murray et al. in 1970, wherein the Claisen rearrangement of neat 7 gave osthenol (4) and its 6-isoprenyl isomer, 7-demethylsuberosin, in 74% and 14% yield, respectively. (a) Murray, R. D. H.; Ballantyne, M. M.; Mathai, K. P. Tetrahedron Lett. 1970, 11, 243.
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The synthesis of osthenol by the same approach was also published by Murray et al. in 1970, wherein the Claisen rearrangement of neat 7 gave osthenol (4) and its 6-isoprenyl isomer, 7-demethylsuberosin, in 74% and 14% yield, respectively. (a) Murray, R. D. H.; Ballantyne, M. M.; Mathai, K. P. Tetrahedron Lett. 1970, 11, 243.
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67650485662
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3-Chloro-3-methyl-1-butyne (6) is available for $96.20 for 5 g.
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3-Chloro-3-methyl-1-butyne (6) is available for $96.20 for 5 g.
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28
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6-DMSO.
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6-DMSO.
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31
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Wang, Z.-X.; Tu, Y.; Frohn, M.; Zhang, J.-R.; Shi, Y. J. Am. Chem. Soc. 1997, 119, 11224.
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The enantiomeric excess of 2 could not be determined by using chiral HPLC under standard conditions; however, polarimetry proved satisfactory, due to the large specific rotation reported for, -columbianetin, see ref 5b
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The enantiomeric excess of 2 could not be determined by using chiral HPLC under standard conditions; however, polarimetry proved satisfactory, due to the large specific rotation reported for (+)-columbianetin, see ref 5b.
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37
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67650495120
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Synthetic 1 was obtained from 2 of 75% ee by polarimetry (Table 1, entry 8). The specific rotation for synthetic 1 is consistent with 75% ee and this value was confirmed by chiral HPLC (see the Supporting Information).
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Synthetic 1 was obtained from 2 of 75% ee by polarimetry (Table 1, entry 8). The specific rotation for synthetic 1 is consistent with 75% ee and this value was confirmed by chiral HPLC (see the Supporting Information).
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