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and references cited therein. For a recent contribution see
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Streptonigrin: (a) Weinreb, S. M. Strategies Tactics Org. Synth. 1984, 1, 325.
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Streptonigrin: (a) Kende, A. S.; Lorah, D. P.; Boatman, R. J. J. Am. Chem. Soc. 1981, 103, 1271.
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24
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(b) Kametani, T.; Kano, S.; Watanabe, Y. Yakugaku Zasshi 1966, 86, 417.
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0014349344
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(a) Heindel, N. D.; Bechara, I. S.; Kennewell, P. D.; Molnar, J.; Ohnmacht, C. J.; Lemke, S. M.; Lemke, T. F. J. Med. Chem. 1968, 11, 1218.
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52
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35549005912
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In the presence of Et3N, a minor degree of overreduction of 12 to 17 occurs only after an extended (> 12 h) contact time
-
3N, a minor degree of overreduction of 12 to 17 occurs only after an extended (> 12 h) contact time.
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-
-
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53
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35548953141
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Experimental procedures and characterization data for compounds not directly related to 1 are provided as Supporting Information.
-
Experimental procedures and characterization data for compounds not directly related to 1 are provided as Supporting Information.
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-
-
-
54
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35548966670
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2.
-
2.
-
-
-
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55
-
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35549004057
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-
13C lines at ca. 104, 118, and 142 ppm. Hardcopy spectra are provided as Supporting Information.
-
13C lines at ca. 104, 118, and 142 ppm. Hardcopy spectra are provided as Supporting Information.
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-
-
-
56
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35549006339
-
-
Substituent Z was H in chalcones 25 related to camptothecin. Such enones cyclized to indolizines only upon exposure to Lewis acidic agents, in contrast to the more electrophilic, doubly activated enones (Z = COOEt, etc.), which cyclize spontaneously.
-
Substituent Z was H in chalcones 25 related to camptothecin. Such enones cyclized to indolizines only upon exposure to Lewis acidic agents, in contrast to the more electrophilic, "doubly activated" enones (Z = COOEt, etc.), which cyclize spontaneously.
-
-
-
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57
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35548949832
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Calculations carried out with the Hyperchem package
-
Calculations carried out with the Hyperchem package.
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58
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0027394922
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Shen, W.; Coburn, C. A.; Bornmann, W. G.; Danishefsky, S. J. J. Org Chem. 1993, 58, 611.
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60
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35548935640
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2.
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2.
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61
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27544461903
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(a) Tamura, Y.; Fujita, M.; Chen, L. C.; Kiyokawa, H.; Ueno, K.; Kita, Y. Heterocycles 1981, 15, 871.
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Ueno, K.5
Kita, Y.6
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63
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35548999682
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-
Condensation of 12 and related substances with protected glycine esters, as well as reduction of nitroketones such as 20 (H2, Pd-C, MeOH, or EtOAc, RT, 1 h; H2, Pd-C, HCl, MeOH-H2O, RT, 5 h; H2, Ra.Ni, MeOH, RT, 1-4 h; Zn, AcOH, RT, 30 min; SnCl 2, HCl, H2O, EtOH, 60°C, 1 h; SnCl2, EtOAc, 60°C, 1 h) afforded largely intractable mixtures of products. Only reduction with SnCl2 followed by treatment with ethyl chloroformate afforded some of the desired material. Customary methods for the conversion of 40 and related compounds to the corresponding bromoketones Br 2, CHCl3, RT, 4 h; Br2, AcOH, RT, 15 min; Br2, AcOH, dioxane, RT, 1-18 h; pyridinium tribromide, AcOH, RT, 1.5 h; CuBr2, CHCl3, RT, 18 h; NBS, NH4OAc, CCl4, 80°C, 4-24 h, were inefficient, and the reaction of the bromoketon
-
3 or with MsNHNa proceeded poorly.
-
-
-
-
64
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0015520853
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(a) Shiori, T.; Ninomiya, K.; Yamada, S. J. Am. Chem. Soc. 1972, 94, 6203.
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Shiori, T.1
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35848945419
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(b) Ninomiya, K.; Shioiri, T.; Yamada, S. Tetrahedron 1974, 30, 2151.
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67
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33749131945
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(b) Peters, R.; Althaus, M.; Diolez, C.; Rolland, A.; Manginot, E.; Veyrat, M. J. Org. Chem. 2006, 71, 7583.
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68
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35548974324
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13C NMR chemical shifts for synthetic and natural 1 is provided as Supporting Information.
-
13C NMR chemical shifts for synthetic and natural 1 is provided as Supporting Information.
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-
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69
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35548961393
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Experimental protocols are provided as Supporting Information
-
Experimental protocols are provided as Supporting Information.
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