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2005
Cyclopentane derivatives
Q 0030
Asymmetric Synthesis of Axially Chiral cis-Arylmethylenebicyclo[3.3.0]octanes
α-Thio- and α-Selenoorganolithium Compounds. — The first convenient
24- 071 Using
enantioselective synthesis of title compounds (V) and (VI) by the reaction of α-thioand α-seleno carbanions derived from (I) with ketal (II) in the presence of (S)-bis(oxazoline)s (IBO and TBO, resp.) and subsequent stereospecific β-elimination is presented. The configuration of the major isomers (III) is assigned by X-ray crystallographic
analysis; the e.e.-values are determined by HPLC. — (WANG, L.; NAKAMURA, S.;
SHIBATA, N.; TORU*, T.; Chem. Lett. 34 (2005) 1, 76-77; Dep. Appl. Chem.,
Nagoya Inst. Technol., Showa, Nagoya 466, Japan; Eng.) — H. Haber
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