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36
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74049123774
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note
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Enantiomeric excess was determined by chiral HPLC. Column: Chiralpak IA No. IA00CE-KL063, eluent: n-hexane/i-PrOH (95:5), flow rate: 0.5 mL/min, UV detector: 240 nm.
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39
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0001685085
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For the Johnson-Claisen rearrangement see:
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For the Johnson-Claisen rearrangement see:. Johnson W.S., Werthemann L., Bartlett W.R., Brocksom T.J., Li T.-T., Faulkner D.J., and Peterson M.R. J. Am. Chem. Soc. 92 (1970) 741
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Werthemann, L.2
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Li, T.-T.5
Faulkner, D.J.6
Peterson, M.R.7
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43
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0042564591
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Brenna, E.1
Fuganti, C.2
Gatti, F.G.3
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Serra, S.5
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44
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0017166973
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Chan K.-K., Cohen N., De Noble J.P., Specian Jr. A.C., and Saucy G. J. Org. Chem. 41 (1976) 3497
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Chan, K.-K.1
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45
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74049129307
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note
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1H NMR of the mixture. Here anti/syn refers to the C3/C4 relative configuration of protons. (b) The reaction was not continued over 4 h so as to avoid the formation of higher amounts of the anti-diastereomer. When the reaction was carried out over shorter periods, lower yields were obtained with no change in the anti/syn ratio.
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46
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74049092224
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note
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The relative configuration of 20a and 20b is based on the comparison of the chemical shifts of Hb protons in the lactones. In 20a, the Hb proton is syn to the vinyl group and is shielded to δ 4.12 as compared to Hb (δ 4.38) in 20b.{A figure is presented}
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47
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74049156763
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note
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The syn-geometry in 20b is further confirmed after the ozonolysis reaction by the fact that it cyclizes to give the γ-(lactone-lactol) intermediate 6b (Scheme 3).
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48
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74049132480
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note
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5i,5s
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-
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49
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74049161941
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note
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3CN, NaH/THF and NaHMDS/THF were attempted to epimerize the -carbon centre of aldehyde 24, but they failed to produce 6c.
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51
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15944379143
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Gao, D.; O'Doherty, G. A. Org. Lett. 2005, 7, 1069. (b) Gao, D.; O'Doherty, G. A. J. Org. Chem. 2005, 70, 9932. (c) The enantiomeric excess reported in the synthesis of 26 is only 85% ee. Hence the compound 26 prepared from (R,R)-diethyl tartrate was used further.
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(a) Gao, D.; O'Doherty, G. A. Org. Lett. 2005, 7, 1069. (b) Gao, D.; O'Doherty, G. A. J. Org. Chem. 2005, 70, 9932. (c) The enantiomeric excess reported in the synthesis of 26 is only 85% ee. Hence the compound 26 prepared from (R,R)-diethyl tartrate was used further.
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52
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74049158221
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note
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5o
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