Heterocyclic synthesis by CC bond formation. Tetrahydrofuran and tetrahydropyran synthesis via oxonium ion-mediated cyclisation reactions
作者:Donald Craig、N.Paul King、Antony N. Shaw
DOI:10.1016/s0040-4039(97)10294-5
日期:1997.12
Dimethyl(methylthio)sulfonium tetrafluoroborate triggers ionisation and cyclisation of hemithioacetals 3 to give tetrahydrofurans 8–11 in good yields and stereoselectivities. The homologous sulfone analogues 17 give tetrahydropyrans on treatment with ethylaluminium dichloride.