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. 2021 Oct 25;6(44):29483–29494. doi: 10.1021/acsomega.1c03469

Table 5. Intermolecular C–H Alkenylation of Coumarins 2.

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entry 2 R1 R2 R3 4 yield (%)a
1 2a Ph CH3 H 4a 31
2 2a Ph t-Bu H 4b 31
3 2d 4(tBu)C6H4 CH3 H 4c 52
4 2e 3,4(OMe)C6H4 CH3 H 4d 28
5 2i CH3 CH3 H 4e 45
6 2i CH3 t-Bu H 4f 53
7 2i CH3 CH3 CH3 4 g 44
a

Yield (%) of the pure isolated compound; in all cases, 30–40% of the unreacted starting material was also recovered.