Access to Cyclobutadienes via an Organocatalytic Dienamine–Iminium–Allenamine Cascade Approach

2017-09-01T00:00:00Z (GMT) by Wenjun Li Ming Lang Jian Wang
A new organocatalytic route to cyclobutadienes from α,β-unsaturated aldehydes and ynals is described. This protocol allows a broad substrate scope and mild conditions. Furthermore, a proposed mechanism of a dienamine–iminium–allenamine cascade process is discussed.