Table 3.

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

Entry	R1	R2	Time (h)	3	Yield (%)b	E/Zc
1	Me	Et	12	3a	95	93:7
2	Et	Et	24	3s	81	94:6
3	n-Pr	Et	48	3t	77	94:6
4	n-Hex	Et	72	3u	43	>99:1
5	Ph	Et	72	–	–	–
6	t-Bu	Et	72	–	–	–
7	2-(4,4-dimethyl)pentyl	Et	72	–	trace	N.D.
8	cyclopentyl	Et	72	–	trace	N.D.
9	Me	Me	10	3v	93	93:7
10	Me	PhCH2	8	3w	91	96:4
11	Me	t-Bu	14	3x	96	96:4

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

^bIsolated yield based on 2.

^cDetermined using ¹H NMR spectroscopy.