9‐membered rings in onepot. The reactions occur under mild conditions with yields up to 90 %. A perfect regioselectivity is obtained, which can be rationalized through a mechanistic hypothesis that considers 1) the formation of an oxonium ylide, 2) its transformation into an unsaturated acyclic oxocarbenium electrophilic intermediate, and 3) an intramolecular nucleophilic attack in a direct application of
Cyclic acetals in the synthesis of polyoxamacrocycles
作者:G. N. Shaikhullina、R. M. Sultanova、I. P. Baikova、G. Z. Raskil´dina、S. S. Zlotskii
DOI:10.1007/s11172-017-1715-x
日期:2017.1
A selective one-pot procedure to access 8-, 9-, and 10-membered polyoxacycles bearing ester functions was elaborated. The procedure involved the copper-promoted reactions of cyclic acetals with ethyl 2-diazo-3-oxobutanoate to give the target compounds in yields up to 99%.