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13
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0344801349
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note
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Although the C9-stereocenter would be eventually lost through oxidation to the ketone, the (9S)-isomer has been shown to be crucial in the success of the macrocyclization reaction, see ref 6b for further discussion.
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14
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33845278140
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Evans, D. A.; Chapman, K. T.; Carreira, E. M. J. Am. Chem. Soc. 1988, 110, 3560-3578.
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Evans, D.A.1
Chapman, K.T.2
Carreira, E.M.3
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17
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4243489506
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For reviews on organozinc reagents in organic synthesis, see: (a) Knochel, P.; Singer, R. D. Chem. Rev. 1993, 93, 2117-2188. (b) Erdik, E. Tetrahedron 1992, 48, 9577-9648.
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Knochel, P.1
Singer, R.D.2
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18
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0026458587
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For reviews on organozinc reagents in organic synthesis, see: (a) Knochel, P.; Singer, R. D. Chem. Rev. 1993, 93, 2117-2188. (b) Erdik, E. Tetrahedron 1992, 48, 9577-9648.
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Tetrahedron
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Erdik, E.1
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19
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0345664290
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note
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3 hybridized organoboronate derived from 4 (through Li→Ḃ exchange) and triflate 5 produced the cross-coupling product in only 15% yield.
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21
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0011067186
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Nicolaou, K. C.; Veale, C. A.; Hwang, C.-K.; Hutchinson, J.; Prasad, C. V. C.; Ogilvie, W. W. Angew. Chem., Int. Ed. Engl. 1990, 30, 300-303.
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Nicolaou, K.C.1
Veale, C.A.2
Hwang, C.-K.3
Hutchinson, J.4
Prasad, C.V.C.5
Ogilvie, W.W.6
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22
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0001616071
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(a) Inanaga, J.; Hirata, K.; Saeki, H.; Katsuki, T.; Yamaguchi, M. Bull. Chem. Soc. Jpn. 1979, 52, 1989-1993.
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Inanaga, J.1
Hirata, K.2
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Yamaguchi, M.5
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23
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0025134909
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Also see ref 6c
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(b) Hikota, M.; Sakurai, V.; Horita, K.; Yonemitsu, O. Tetrahedron Lett. 1990, 31, 6367-6370. Also see ref 6c.
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Hikota, M.1
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Yonemitsu, O.4
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24
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0345664289
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note
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Attempts to introduce the C8-epoxide on the C11 benzyl ether of 23 were unsuccessful, as no trace of epoxide was detected using m-CPBA.
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25
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0027997412
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(a) The selectivity of this TPAP oxidation is believed to originate from the positioning of the C11 equatorial proton into the center of the macrocycle making it inaccessible in the oxidative addition step involving the α-C-H bond to the oxo-metal bond (cf.: Ley, S. V.; Norman, J.; Griffith, W. P.; Marsden, S. P. Synthesis 1994, 639-666). (b) For the selective chromic acid oxidation see: Corey, E. J.; Melvin, L. S. Tetrahedron Lett. 1975, 929-932.
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(1994)
Synthesis
, pp. 639-666
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Ley, S.V.1
Norman, J.2
Griffith, W.P.3
Marsden, S.P.4
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26
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0011129955
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(a) The selectivity of this TPAP oxidation is believed to originate from the positioning of the C11 equatorial proton into the center of the macrocycle making it inaccessible in the oxidative addition step involving the α-C-H bond to the oxo-metal bond (cf.: Ley, S. V.; Norman, J.; Griffith, W. P.; Marsden, S. P. Synthesis 1994, 639-666). (b) For the selective chromic acid oxidation see: Corey, E. J.; Melvin, L. S. Tetrahedron Lett. 1975, 929-932.
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(1975)
Tetrahedron Lett.
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Corey, E.J.1
Melvin, L.S.2
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