Iminoether - enaminoether tautomerism. Elaboration of quaternary carbon centers by a new Michael-type reaction
摘要:
Cyclic iminoethers 4 and 10 have been shown to be in N,C-tautomeric equilibrium with their corresponding secondary enaminoethers 5 and 11 which can be C-alkylated with electrophilic olefins leading to functionalized alpha,alpha-disubstituted iminoethers 8 and 12 and yielding the corresponding lactones 9 and 13 upon hydrolysis.