Table 2.

NHC-Cu-catalyzed ECA of aryl-substituted enones with Et₃AI.^[a]

Entry	Ar; Substrate	Product	t[h]	Conv. [%];[b] Yield [%][c]	e.r.[d]
1	Ph; 2b	5a	0.5	>98; 93	98:2
2	2-thienyl; 2c	5b	1.0	>98; 86	98.5:1.5
3	pF3CC6H4; 2e	5c	1.0	>98; 89	99:1
4	pMeOC6H4; 2f	5d	1.0	>98; 92	99:1
5	2-naphthyl; 2h	5e	2.5	97; 94	97.5:2.5
6	oBrC6H4; 2i	5f	12	98; 87	>99:1
7	mFC6H4; 2j	5g	3.0	>98; 90	96.5:3.5

^[a]Reactions were performed under N₂ atmosphere.

^[b]Determined through analysis of 400 MHz 1H NMR spectra of unpurified mixtures.

^[c]Yield of isolated and purified products.

^[d]Determined by GC analysis (entries 1-2) or HPLC analysis (±2%); see the Supporting Information for details.