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Note | Regular issue | Vol 60, No. 11, 2003, pp.2551-2556
Published online, 5th September, 2003
DOI: 10.3987/COM-03-9874
Synthesis of Novel Chiral Spiro Bis(pyrazole) Ligands

Shinobu Takizawa, Yuji Honda, Midori A. Arai, Takahiro Kato, and Hiroaki Sasai*

*The Institute of Scientific and Industrial Research, Osaka University, Mihogaoka, Ibaraki, Osaka 567-0047, Japan


The first synthesis of spiro bis(pyrazole) ligands, 2,2’,4,4’-tetrahydro-6,6’-spirobi[5H-cycopentapyrazole] (1a) and 2,2’-dibenzyl-2,2’,4,4’-tetrahydro-6,6’-spirobi[5H-cycopentapyrazole] (1b) was achieved. The application of spiro bis(pyrazole) ligand to asymmetric catalysis was also examined.