Singh, Udai P. and Babbar, Preeti and Hassler, Bernd and Nishiyama, H. and Brunner, Henri (2002) Optically active pyrazolylborate: synthesis, characterization and uses in enantioselective cyclopropanation reaction. JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL, 185 (1-2): PII S1381-. pp. 33-39. ISSN 1381-1169
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Optically active sodium salt of tetrakis(4,5,6,7-tetrahydro-7,8,8-trimethyl-2H-4,7-methanoindazolyl)borate, [NaB(camphpz)(4)] (1) was synthesized by the reaction of 4,5,6,7-tetrahydro-7,8,8-trimethyl-2H-4,7-methanoindazole and NaBH4 whereas sodium salt of hydrotris((-)-3(5)-methyl-1-phenylethylaminomethylpyrazolyl)borate, [NaHB(Pl)3] (2) was prepared by the reaction of (-)-3(5)-methyl-1-phenylethylaminomethylpyrazole with NaBH4. Their uses in various metal-catalysed enantioselective cyclopropanation reactions of styrene and several diazoacetates gave the corresponding trans- and cis-phenylcyclopropane-1-carboxylates with moderate to reasonably good enantioselectivities. (C) 2002 Elsevier Science B.V. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | COPPER(I)-CATALYZED ASYMMETRIC CYCLOPROPANATION; POLYPYRAZOLYLBORATE COPPER(I) COMPLEXES; CHIRAL DIRHODIUM(II) CARBOXAMIDES; METAL CARBENE TRANSFORMATIONS; RESTRICTED PEPTIDE ISOSTERES; BIS(OXAZOLINE)-COPPER COMPLEXES; CATALYTIC CYCLOPROPANATION; INTRAMOLECULAR CYCLOPROPANATION; LIGANDS; OLEFINS; pyrazolylborate; optical activity; copper, rhodium and ruthenium catalysts; cyclopropanation; enantioselectivity |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Anorganische Chemie > Alumni or Retired Professors > Prof. Dr. Henri Brunner |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 12 Oct 2021 12:39 |
| Last Modified: | 12 Oct 2021 12:39 |
| URI: | https://pred.uni-regensburg.de/id/eprint/40088 |
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