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For related zirconium-zinc transmetalations, see: (a) Wipf P, Kendall C. Novel applications of alkenyl zirconocenes. Chem Eur J 2002;8: 1778-1784. (b) Wipf P, Kendall C. Tandem zirconocene homologation - aldimine addition. Org Lett 2001;3:2773-2776. (c) Wipf P, Kendall C, Stephenson CRJ. Three-component aldimine addition - cyclopropanation. An efficient new methodology for amino cyclopropane synthesis. J Am Chem Soc 2001;123:5122-5123. (d) Wipf P, Coish PDG. Total synthesis of (±)-nisamycin. J Org Chem 1999;64: 5053-5061. (e) Wipf P, Coish PDG. Organozirconocene-mediated polyene synthesis: preparation of asukamycin and manumycin A side chains. Tetrahedron Lett 1997;38:5073-5076. (f) Wipf P, Xu W, Takahashi H, Jahn H, Coish PDG. Synthetic applications of organozirconocenes. Pure Appl Chem 1997;69:639-644, and references therein. (g) Shen R, Lin CT, Porco JA. Total synthesis and stereochemical assignment of the salicylate antitumor antibiotic lobatamide C. J Am Chem Soc 2002;124:5650-5651. (h) Wipf P, Reeves JT. A formal total synthesis of leucascandrolide A. Chem Commun 2002:2066-2067.
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For related zirconium-zinc transmetalations, see: (a) Wipf P, Kendall C. Novel applications of alkenyl zirconocenes. Chem Eur J 2002;8: 1778-1784. (b) Wipf P, Kendall C. Tandem zirconocene homologation - aldimine addition. Org Lett 2001;3:2773-2776. (c) Wipf P, Kendall C, Stephenson CRJ. Three-component aldimine addition - cyclopropanation. An efficient new methodology for amino cyclopropane synthesis. J Am Chem Soc 2001;123:5122-5123. (d) Wipf P, Coish PDG. Total synthesis of (±)-nisamycin. J Org Chem 1999;64: 5053-5061. (e) Wipf P, Coish PDG. Organozirconocene-mediated polyene synthesis: preparation of asukamycin and manumycin A side chains. Tetrahedron Lett 1997;38:5073-5076. (f) Wipf P, Xu W, Takahashi H, Jahn H, Coish PDG. Synthetic applications of organozirconocenes. Pure Appl Chem 1997;69:639-644, and references therein. (g) Shen R, Lin CT, Porco JA. Total synthesis and stereochemical assignment of the salicylate antitumor antibiotic lobatamide C. J Am Chem Soc 2002;124:5650-5651. (h) Wipf P, Reeves JT. A formal total synthesis of leucascandrolide A. Chem Commun 2002:2066-2067.
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For related zirconium-zinc transmetalations, see: (a) Wipf P, Kendall C. Novel applications of alkenyl zirconocenes. Chem Eur J 2002;8: 1778-1784. (b) Wipf P, Kendall C. Tandem zirconocene homologation - aldimine addition. Org Lett 2001;3:2773-2776. (c) Wipf P, Kendall C, Stephenson CRJ. Three-component aldimine addition - cyclopropanation. An efficient new methodology for amino cyclopropane synthesis. J Am Chem Soc 2001;123:5122-5123. (d) Wipf P, Coish PDG. Total synthesis of (±)-nisamycin. J Org Chem 1999;64: 5053-5061. (e) Wipf P, Coish PDG. Organozirconocene-mediated polyene synthesis: preparation of asukamycin and manumycin A side chains. Tetrahedron Lett 1997;38:5073-5076. (f) Wipf P, Xu W, Takahashi H, Jahn H, Coish PDG. Synthetic applications of organozirconocenes. Pure Appl Chem 1997;69:639-644, and references therein. (g) Shen R, Lin CT, Porco JA. Total synthesis and stereochemical assignment of the salicylate antitumor antibiotic lobatamide C. J Am Chem Soc 2002;124:5650-5651. (h) Wipf P, Reeves JT. A formal total synthesis of leucascandrolide A. Chem Commun 2002:2066-2067.
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For related zirconium-zinc transmetalations, see: (a) Wipf P, Kendall C. Novel applications of alkenyl zirconocenes. Chem Eur J 2002;8: 1778-1784. (b) Wipf P, Kendall C. Tandem zirconocene homologation - aldimine addition. Org Lett 2001;3:2773-2776. (c) Wipf P, Kendall C, Stephenson CRJ. Three-component aldimine addition - cyclopropanation. An efficient new methodology for amino cyclopropane synthesis. J Am Chem Soc 2001;123:5122-5123. (d) Wipf P, Coish PDG. Total synthesis of (±)-nisamycin. J Org Chem 1999;64: 5053-5061. (e) Wipf P, Coish PDG. Organozirconocene-mediated polyene synthesis: preparation of asukamycin and manumycin A side chains. Tetrahedron Lett 1997;38:5073-5076. (f) Wipf P, Xu W, Takahashi H, Jahn H, Coish PDG. Synthetic applications of organozirconocenes. Pure Appl Chem 1997;69:639-644, and references therein. (g) Shen R, Lin CT, Porco JA. Total synthesis and stereochemical assignment of the salicylate antitumor antibiotic lobatamide C. J Am Chem Soc 2002;124:5650-5651. (h) Wipf P, Reeves JT. A formal total synthesis of leucascandrolide A. Chem Commun 2002:2066-2067.
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For related zirconium-zinc transmetalations, see: (a) Wipf P, Kendall C. Novel applications of alkenyl zirconocenes. Chem Eur J 2002;8: 1778-1784. (b) Wipf P, Kendall C. Tandem zirconocene homologation - aldimine addition. Org Lett 2001;3:2773-2776. (c) Wipf P, Kendall C, Stephenson CRJ. Three-component aldimine addition - cyclopropanation. An efficient new methodology for amino cyclopropane synthesis. J Am Chem Soc 2001;123:5122-5123. (d) Wipf P, Coish PDG. Total synthesis of (±)-nisamycin. J Org Chem 1999;64: 5053-5061. (e) Wipf P, Coish PDG. Organozirconocene-mediated polyene synthesis: preparation of asukamycin and manumycin A side chains. Tetrahedron Lett 1997;38:5073-5076. (f) Wipf P, Xu W, Takahashi H, Jahn H, Coish PDG. Synthetic applications of organozirconocenes. Pure Appl Chem 1997;69:639-644, and references therein. (g) Shen R, Lin CT, Porco JA. Total synthesis and stereochemical assignment of the salicylate antitumor antibiotic lobatamide C. J Am Chem Soc 2002;124:5650-5651. (h) Wipf P, Reeves JT. A formal total synthesis of leucascandrolide A. Chem Commun 2002:2066-2067.
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note
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The rate of the background reaction of the process shown in Scheme 1, i.e., the benzaldehyde addition of an alkenylzirconocene reagent after transmetalation to dimethylzinc in the absence of a chiral ligand, is very similar to the rate observed in the presence of 10 mol% of 2c; see Ref. 6a.
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85006853131
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The %ee in the presence of ligand 2c was found to be independent of conversion. Similarly, after 20% conversion in the presence of 15 mol% of ligand 2a, product 3 was isolated in 70.1 %ee.
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