Formation of Tetrahydrofuran from Homoallylic Alcohol via a Tandem Sequence: 2-Oxonia [3,3]-Sigmatropic Rearrangement/Cyclization Catalyzed by In(OTf)<sub>3</sub>
作者:Teck-Peng Loh、Qi-Ying Hu、Li-Ting Ma
DOI:10.1021/ja005831j
日期:2001.3.1
Stereocontrolled Synthesis of Linear 22<i>R</i>-Homoallylic Sterols via a Triflic Acid-Catalyzed 2-Oxonia Cope Rearrangement
作者:Teck-Peng Loh、Qi-Ying Hu、Li-Ting Ma
DOI:10.1021/ol026136e
日期:2002.7.1
[reaction: see text] Poor stereoselectivity caused by the involvement of side reaction pathways was observed in the In(OTf)(3)-catalyzed allyl-transfer reaction (R = electron-withdrawing group). Subsequently, it was found that the employment of triflic acid (TFA) as catalyst could successfully suppress the side reaction pathways and, hence, achieve high stereoselectivity.