Table 2.

Fused Ketenimine–[2 + 2] Cycloadditions

entry	ynamide	fused–[2+2] cycloadduct	yield [%]b,c
1			86
2			71d
3			85
4			72
5			85e

^aReaction conditions: 5 mol % Pd(PPh₃)₄, Tol [conc = 0.1 M], 70 °C, 2 h.

^bIsolated yields.

^c≥20:1 dr by ¹H NMR unless otherwise noted.

^d10–20% cyclopentenimine.

^e9:1 dr as measured by ¹H NMR.