Table 2.

Scope of the reaction of the allene 1a with various sulfonamide 2.^a

Entry	R	Time (h)	3	Yield (%)b	E/Zc
1	H	12	3a	95	93:7
2	4-Me	12	3b	96	93:7
3	4-MeO	24	3c	93	94:6
4	4-Br	12	3d	95	94:6
5	4-Cl	9	3e	96	93:7
6	4-F	7	3f	98	94:6
7	4-NO2	30	3g	92	90:10
8	3-Me	10	3h	95	94:6
9	3-Br	8	3i	93	93:7
10	3-Cl	9	3j	88	96:4
11	3-NO2	24	3k	88	89:11
12	2-NO2	26	3l	82	99:1
13	2-Me	16	3m	94	91:9
14	2-Cl	10	3n	97	96:4
15	2-F	9	3o	96	91:9
16	2-CO2Me	24	3p	92	94:6
17	2,6-di-Cl	8	3q	91	95:5
18	(2r)	8	3r	81	93:7

^aReactions of 1a (0.3 mmol) and 2 (0.2 mmol) were performed in Et₂O (2 mL) at room temperature.

^bIsolated yield based on 2.

^cDetermined using ¹H NMR spectroscopy.