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34
-
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0038447402
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note
-
Lactone (+)-14 can be prepared from commercially available (-)-Wieland-Miescher ketone in 16 steps and 8% overall yield.
-
-
-
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37
-
-
0037770548
-
-
note
-
A similar protocol had also proven effective in our paspalicine and paspalinine synthetic ventures.
-
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38
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0003979828
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Academic Press Inc.: San Diego
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Sundberg, R.J.1
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0000829780
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24 polycycloalkanes to dodecahedrane and dimethyl dodecahedrane, see: Eaton, P. E. Tetrahedron 1979, 35, 2189-2223, and references therein.
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43
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0037770551
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note
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See the Supporting Information for the experimental procedure.
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44
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0037770550
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Ph.D. Thesis, University of Pennsylvania
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Hartz, R. A. Ph.D. Thesis, University of Pennsylvania, 1996.
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84979133927
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Conley, R.T.1
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50
-
-
0038108124
-
-
note
-
With the fully elaborated coupling partners, the heteroatom Peterson olefination did not go to completion without external promoters such as silica gel or heating; see also ref 6e.
-
-
-
-
52
-
-
0038447403
-
-
note
-
Attempts to use a MOM protecting group at C(25) as in the earlier model study failed due to our inability to differentiate the secondary and tertiary hydroxyls at C(25) and C(16), respectively.
-
-
-
-
53
-
-
0038108127
-
-
note
-
Without the auxiliary hydrazone 37, we were unable to detect the desired coupling product between (+)-35 and (-)-15.
-
-
-
-
54
-
-
0037770554
-
-
note
-
Intermediates (+)-38 and (+)-39 were both single isomers; the stereochemistry was not determined.
-
-
-
-
55
-
-
0038447405
-
-
note
-
3OD.
-
-
-
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56
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0010422691
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Grieco and co-workers exploited these conditions in an elegant synthesis of yuehchukene, see: (a) Grieco, P. A.; Clark, J. D.; Jagoe, C. T. J. Am. Chem. Soc. 1991, 113, 5488-5489. (b) Henry, K. J., Jr.; Grieco, P. A. J. Chem. Soc., Chem. Commun. 1993, 510-512.
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57
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0343629064
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Grieco and co-workers exploited these conditions in an elegant synthesis of yuehchukene, see: (a) Grieco, P. A.; Clark, J. D.; Jagoe, C. T. J. Am. Chem. Soc. 1991, 113, 5488-5489. (b) Henry, K. J., Jr.; Grieco, P. A. J. Chem. Soc., Chem. Commun. 1993, 510-512.
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Henry K.J., Jr.1
Grieco, P.A.2
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58
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0038108128
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-
note
-
The major byproduct was a diene i (32% yield).
-
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59
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0024353577
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Nicolaou, K. C.; Hwang, C.-K.; Nugiel, D. A. J. Am. Chem. Soc. 1989, 111, 4136-4137.
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0038785023
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note
-
Higher reaction temperature and/or longer reaction time resulted in over-reduction of the olefin in the side chain.
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61
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Dhaon, M. K.; Olsen, R. K.; Ramasamy, K. J. Org. Chem. 1982, 47, 1962-1965.
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64
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0033531680
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A similar autoxidation of an enol (ii) was observed by Kuwajima and co-workers during the synthesis of (+)-taxusin, see: Hara, R.; Furukawa, T.; Kashima, H.; Kusama, H.; Horiguchi, Y.; Kuwajima, I. J. Am. Chem. Soc. 1999, 121, 3072-3082. Equation presented
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0002652021
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Morrison, J. D., Ed.; Academic Press: New York Chapter 1
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0038108123
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note
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The lability of the TBS protecting group suggested that the use of the more robust TIPS ether would prove advantageous.
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