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. 2018 Jun 5;14:1317–1348. doi: 10.3762/bjoc.14.113

Table 6.

Photochemical cycloaddition of N-phenylsydnones with non-symmetrical alkynes.

graphic file with name Beilstein_J_Org_Chem-14-1317-i070.jpg
entry R2 R3 R4 conditions ratio a:b yield a/b [%] ref.
1 Ph H COOMe benzene, 23 h, light (300 nm) 16:84 12/62 [63–64]
2 Ph COOEt Ph CH2Cl2, 27.5 h, light (300 nm) 0:100 0/33 [63–64]
3 Ph H Ph CH2Cl2, 66 h, light (300 nm) 0:100 0/63 [63–64]
4 Me H Ph CH2Cl2, 62 h, light (300 nm) 0:100 0/13 [64]
5 MeS H COOMe CH2Cl2, 27 h, light (300 nm) 12:88 6/44 [64]
6 PhS H COOMe benzene, 18.5 h, light (300 nm) n.d. 5/41 [64]