Table 3.

[3+2] Cycloaddition ofstyrene (2a) with bicyclic cyclopropylamines 5.^[a]

Entry	Substrate	Product[b]	t [h]	Yield [%][c]
				d.r.[d]
1			5	77 4:1
2			8	74 5:1
3			36	69 5:1
4			12	28 (64)[e] >25:1
5			6	72 3:1
6			12	58 4:1

^[a]Reaction conditions: 5a–f (0.2 mmol, 0.1m in degassed CH₃NO₂), 2a (1 mmol), 4a (2 mol%), irradiation with a 13 W fluorescent lightbulb at RT.

^[b]Only the major diastereoisomer shown.

^[c]Combined yields of the two isomers after chromatography.

^[d]Determined by ¹H NMR analysis of the crude products (α/β).

^[e]Based on recovered 5d.