http://repository.iitr.ac.in/handle/123456789/4168| Title: | Optically active pyrazolylborate: Synthesis, characterization and uses in enantioselective cyclopropanation reaction |
| Authors: | Singh U.P. Babbar P. Hassler B. Nishiyama H. Brunner H. |
| Published in: | Journal of Molecular Catalysis A: Chemical |
| Abstract: | Optically active sodium salt of tetrakis(4,5,6,7-tetrahydro-7,8,8-trimethyl-2H-4,7-methanoindazolyl)borate, [NaB(camp-hpz)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(P1)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-phenyl-cyclopropane-1-carboxylates with moderate to reasonably good enantioselectivities. © 2002 Elsevier Science B.V. All rights reserved. |
| Citation: | Journal of Molecular Catalysis A: Chemical (2002), 185(43832): 33-39 |
| URI: | https://doi.org/10.1016/S1381-1169(02)00075-4 http://repository.iitr.ac.in/handle/123456789/4168 |
| Issue Date: | 2002 |
| Keywords: | Copper, rhodium and ruthenium catalysts Cyclopropanation Enantioselectivity Optical activity Pyrazolylborate |
| ISSN: | 13811169 |
| Author Scopus IDs: | 57203181883 6506387993 6701715527 7201928882 7402010801 |
| Author Affiliations: | Singh, U.P., Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247 667, India Babbar, P., Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247 667, India Hassler, B., School of Material Science, Toyohashi University of Technology, Toyohashi 441-8580, Japan Nishiyama, H., School of Material Science, Toyohashi University of Technology, Toyohashi 441-8580, Japan Brunner, H., Institut Für Anorganische Chemie, Universität Regensburg, D-93040 Regensburg, Germany |
| Funding Details: | Authors (UPS and PB) are very grateful to Department of Science and Technology, Government of India, New Delhi, for financial support in the form of young scientist project (No. HR/OY/C-20/96). |
| Corresponding Author: | Singh, U.P.; Department of Chemistry, Indian Inst. of Technology Roorkee, Roorkee 247 667, India; email: udaipfcy@rurkiu.ernet.in |
| Appears in Collections: | Journal Publications [CY] |
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