Table 3.

Photochemical cycloaddition of N-phenylsydnones with DMAD.

entry	R1	R2	conditions	yield [%]	ref.
1	Ph	H	CH2Cl2, 50 h, light (300 nm)	10	[63–64]
2	Ph	Me	CH2Cl2, 19 h, light (300 nm)	23	[63–64]
3	Ph	Ph	benzene, 2 h, CH2Cl2, light (300 nm), batch CH2Cl2, 29.5 h, light (300 nm) wetted-wall photoreactor dioxane, Hg lamp	67 29 29 84 ca. 80	[62] [63] [64] [64] [65]
4	Ph	4-Me-Ph	CH2Cl2, Hg lamp	ca. 80	[65]
5	Ph	MeS	benzene, 25 h, Hg lamp	45	[64]
6	Ph	MeSO	CH2Cl2, 110 h, Hg lamp	12	[64]
7	Ph	MeCO	benzene, 41 h, Hg lamp	17	[64]