Formation of cycloadducts with trans-configurated ester groups from nitrones and dimethyl maleate
作者:Hans Günter Aurich、Gerlinde Frenzen、Markus G. Rohr
DOI:10.1016/s0040-4020(01)90471-5
日期:——
there is no clue for either a non-concerted reaction course or a subsequent conversion of the cis-products to trans-product in general. Rather conversion of dimethylmaleate to dimethyl fumarate seems to be responsible for the formation of the trans-substituted cycloadducts. This conversion can be induced by small quantities of N-alkylhydroxylamine formed from slight decomposition of nitrones under the