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2005
Pyrazole derivatives
R 0180
Zirconium-Catalyzed Enantioselective [3 + 2] Cycloaddition of Hydrazones to
Leading to Optically Active Pyrazolidine, Pyrazoline, and 1,3-Diamine
03- 125 Olefins
Derivatives. — First examples for enantioselective [3 + 2]-cycloaddition of hydrazones to external olefins are presented. The reaction is proposed to proceed via concerted pathways. Synthetic value of this method is demonstrated by synthesis of the antipode of pyrazoline derivative MS-153 (XII), a cerebroprotecting agent. —
(YAMASHITA, Y.; KOBAYASHI*, S.; J. Am. Chem. Soc. 126 (2004) 36,
11279-11282; Grad. Sch. Pharm. Sci., Univ. Tokyo, Bunkyo, Tokyo 113, Japan; Eng.)
— Nuesgen
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