Effect of temperature in ee^a,b.

Entryc	T °(C)	t (h)	5f (%)	e.r.d	8f (%)
1	120	6	67	68 : 32	15
2	90	6	69	85 : 15	—
3e	70	18	31	92 : 8	—
4f	70	6	27	95 : 5	—
5g	50	24	—		—

^aUnless otherwise stated, reactions were carried out on a 0.404 mmol scale using 5 equiv. of 4a, 2 equiv. of K₂CO₃ in 3.0 mL of MeCN.

^bThe major enantiomer L is shown.

^cYields are given for isolated products.

^de.r was calculated from enantioselective HPLC analysis (see ESI for more details).

^eThe starting indole 1c was recovered in 50% of yield.

^fThe starting indole 1c was recovered in 60% of yield.

^gThe starting indole 1c was recovered almost quantitatively.