Answers are grounded in this paper and cite their sources.
The [4+2]-cycloaddition reaction of 3-olefinic oxindoles with a tetraenamine intermediate is presented. In the reaction, a novel class of highly functionalized spirocyclic cyclohexanes with four stereocenters is formed in high yield and excellent stereoselectivity. Mechanistic investigations and calculations point to a stepwise mechanism involving tetraenamine intermediates. Furthermore, several transformations are presented.
No takes yet. Share an insight, caveat, or question.
Stiller et al. (2014) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: