Table 2.

[3+2] Cycloaddition of styrene (2a) with monocyclic cyclopropylamines (1).^[a]

Entry	Substrate	Product	t [h]	Yield [%][d]
1[b]	1a, R=H		3	87
2[b]	1b, R=4-CI		6	82
3[b]	1c, R=4-CF3		4	82
4[c]			24	80
5[c]			6	75
6[b]			48	71

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

^[b]d.r.=1:1

^[c]d.r.=3:2 as determined by ¹H NMR spectroscopy of crude products.

^[d]Yield of the combined isomers after isolation.