Intramolecular nitrone dipolar cycloadditions: control of regioselectivity and synthesis of naturally-occurring spirocyclic alkaloids
作者:Alastair J. Hodges、Joseph P. Adams、Andrew D. Bond、Andrew B. Holmes、Neil J. Press、Stephen D. Roughley、John H. Ryan、Simon Saubern、Catherine J. Smith、Michael D. Turnbull、Annabella F. Newton
DOI:10.1039/c2ob26333e
日期:——
The intramolecular nitrone dipolarcycloaddition of in situ-generated nitrones such as compound 26 has been used for the synthesis of cyclic isoxazolidines 27 and 29. The regioselectivity of the intramolecularcycloaddition depends on the nature of the terminal substituent on the dipolarophile. The influence of the substituent on the regioselectivity of the cycloaddition has been examined using several