Table 1.

Dehydrative cyclization scope.^[a]

Entry	Substrate	Product	Yield[b]	dr[c]
1			81%	1.7:1
2			81%	2.6:1
3			71%	>30:1
4			86%	>30:1
5			86%	7.6:1
6			85%	>15:1
7			84%	16:1
8			77%	>30:1
9			56%	2.9:1

^[a]See the Supporting Information for experimental procedures and spectral data.

^[b]Combined yield of the diastereomeric mixture.

^[c]Determined by ¹H NMR analysis of the crude product mixture.