Highly Efficient Asymmetric Synthesis of Fluvirucinine A<sub>1</sub> via Zr-Catalyzed Asymmetric Carboalumination of Alkenes (ZACA)−Lipase-Catalyzed Acetylation Tandem Process
作者:Bo Liang、Ei-ichi Negishi
DOI:10.1021/ol702272d
日期:2008.1.1
ZACA-lipase-catalyzed acetylation tandem process has been shown to proceed satisfactorily with either TBS-protected 4-penten-1-ol or 3-buten-1-ol to provide the corresponding enantiomerically pure (R)-2-ethyl-1-alkanols. Either (R)-5 or (R)-6 was converted to 3 in seven steps. The other fragment 4 was synthesized in nine steps from (-)-(S)-citronellol. Conversion of 3 and 4 into 99% pure fluvirucinine
Catalytic and Enantioselective Route to Medium-Ring Heterocycles. Asymmetric Zirconium-Catalyzed Ethylmagnesation of Seven- and Eight-Membered Rings
作者:Michael S. Visser、Nicola M. Heron、Mary T. Didiuk、John F. Sagal、Amir H. Hoveyda
DOI:10.1021/ja960163g
日期:1996.1.1
A variety of medium-ring heterocycles, prepared efficiently by the Ru-catalyzed diene metathesis method, undergo asymmetric catalytic ethylmagnesation to afford nonracemic unsaturated alcohols and ...