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10
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20644469294
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note
-
13C NMR spectra of macrocarpals C 3 and G 4 were measured in different solvents, which made comparison difficult. In ref 1, it has been considered that these were diastereomers due to difference between their physicochemical properties.
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0003662244
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When the corresponding benzyl acetate was used for the coupling reaction, none of the desired product was obtained. For examples for the coupling reaction of benzyl acetates with silylenol ethers, see: Reetz, M. T.; Hüttenhain, S.; Hübner, F. Synth. Commun. 1981,11, 217.
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0010849445
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Morris, M.J.1
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34
-
-
33847520026
-
-
The reaction should be carried out at 120 ± 5 °C (bath temperature) since 19 decomposes (decomplexes) at 136 °C.
-
The reaction should be carried out at 120 ± 5 °C (bath temperature) since 19 decomposes (decomplexes) at 136 °C.
-
-
-
-
35
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0000921269
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0001222072
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39
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33847501725
-
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Direct Cr-complexation of the antecedent diester 16 was failed under various conditions.
-
Direct Cr-complexation of the antecedent diester 16 was failed under various conditions.
-
-
-
-
40
-
-
20644472091
-
-
note
-
22
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41
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33847491562
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27
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67
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69
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49049128445
-
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For a review on Barton deoxygenation, see: Hartwig, W. Tetrahedron 1983, 39, 2609.
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85038134535
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Trost, B. M., Eds.; Pergamon: New York, Chapter 4.2.
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McCombie, S.W.1
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-
73
-
-
20644436097
-
-
note
-
It appears that the formation of the byproduct 27 was attributed to more reactive l,l'-carbonyldiimidazole as contamination of 1,1′-thiocarbonyldiimidazole used in a large excess. In fact, treatment of 25 with 1.1′-carbonyldiimidazole under the same condition afforded only 27 (83% yield).
-
-
-
-
74
-
-
20644451075
-
-
note
-
The author has deposited atomic coordinates for this structure with the Cambridge Crystallographic Data Centre (CCDC 182/601). The coordinates can be obtained, on request, from the Director, Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge, CB2 1EZ, UK.
-
-
-
-
77
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0005297156
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Hutchins, R. O.; Hutchins, M. G.; Milewski, C. A. J. Org. Chem. 1972, 37, 4190.
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33847800152
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79
-
-
33847510984
-
-
To remove the excess of reagents, we operated the oxidative workup before isolation.
-
To remove the excess of reagents, we operated the oxidative workup before isolation.
-
-
-
-
80
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0025011727
-
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3P-azodicarboxylate): Akita, H.; Yamada, H.; Matsukura, H.; Nakata, T.; Oishi, T. Chem. Pharm. Bull. 1990, 38, 2377.
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0027997412
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For a review on TPAP oxidation, see: Ley, S. V.; Norman, J.; Griffith, W. P.; Marsden, S. P. Synthesis 1994, 639.
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Synthesis
, pp. 639
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Ley, S.V.1
Norman, J.2
Griffith, W.P.3
Marsden, S.P.4
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86
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0001213177
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Hwu, J. R.; Wong, F. F.; Huang, J.-J.; Tsay, S.-C. J. Org. Chem. 1997, 62, 4097.
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(1997)
J. Org. Chem.
, vol.62
, pp. 4097
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Hwu, J.R.1
Wong, F.F.2
Huang, J.-J.3
Tsay, S.-C.4
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88
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33847526746
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3CN.
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3CN.
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-
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89
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33847510320
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Lithiump-thiocresolate is conveniently prepared in quantitative yield fromp-thiocresol and n-BuLi in toluene at 0 °C. This salt can be stored at room temperature in a desiccator for months.
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Lithiump-thiocresolate is conveniently prepared in quantitative yield fromp-thiocresol and n-BuLi in toluene at 0 °C. This salt can be stored at room temperature in a desiccator for months.
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94
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33847524457
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Nishizawa, M., a personal letter on April 15
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Nishizawa, M., a personal letter on April 15, 1997.
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(1997)
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