Fragmentation of 6-Deoxy-6-halo-hexono-1,5-ortholactones: A Concerted, Nonstereospecific Process
作者:Bruno Bernet、Andrea Vasella
DOI:10.1002/hlca.19840670519
日期:1984.8.8
D-arabino- and D-ribo-ortholactones 13a–f and 15b–f and their treatment with Zn leading to the unsaturated esters 14a–d and 16a–d are described. Possible fragmentation mechanisms are discussed. The results were only compatible wit a concerted, nonsynchronous process, where both the axial lone pair of the ring oxygen atom and the lone pair formed during rupture of the C(5), O-bond participate in the elimination