Chinese Journal of Catalysis ›› 2022, Vol. 43 ›› Issue (9): 2388-2394.DOI: 10.1016/S1872-2067(22)64140-8
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Zhi-Yu Bo†, Si-Shun Yan†, Tian-Yu Gao, Lei Song, Chuan-Kun Ran, Yi He, Wei Zhang*(), Guang-Mei Cao, Da-Gang Yu#()
Received:
2022-04-29
Accepted:
2022-05-19
Online:
2022-09-18
Published:
2022-07-20
Contact:
Wei Zhang, Da-Gang Yu
About author:
First author contact:†Contributed equally to this work.
Supported by:
Zhi-Yu Bo, Si-Shun Yan, Tian-Yu Gao, Lei Song, Chuan-Kun Ran, Yi He, Wei Zhang, Guang-Mei Cao, Da-Gang Yu. Visible-light photoredox-catalyzed selective carboxylation of C(sp2)-F bonds in polyfluoroarenes with CO2[J]. Chinese Journal of Catalysis, 2022, 43(9): 2388-2394.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(22)64140-8
Entry | Variations form the standard | Yield (%) |
---|---|---|
1 | none | 78 |
2 | w/o [Ir(ppy)2(dtbbpy)]PF6 | trace |
3 | w/o light | N.D. |
4 | N2 instead of CO2 | trace |
5 | w/o HCO2K | < 5 |
6 | quinuclidine as HAT reagent | < 5 |
7 | w/o DABCO | 37 |
8 | w/o base | 44 |
9 | DMSO instead of DMF | (43) |
10 | Cs2CO3 (2.5 eq.) instead of CsF/Cs2CO3 | 61 |
11 | CsF (2.5 eq.) instead of CsF/Cs2CO3 | 62 |
Table 1 Optimization of reaction conditions.
Entry | Variations form the standard | Yield (%) |
---|---|---|
1 | none | 78 |
2 | w/o [Ir(ppy)2(dtbbpy)]PF6 | trace |
3 | w/o light | N.D. |
4 | N2 instead of CO2 | trace |
5 | w/o HCO2K | < 5 |
6 | quinuclidine as HAT reagent | < 5 |
7 | w/o DABCO | 37 |
8 | w/o base | 44 |
9 | DMSO instead of DMF | (43) |
10 | Cs2CO3 (2.5 eq.) instead of CsF/Cs2CO3 | 61 |
11 | CsF (2.5 eq.) instead of CsF/Cs2CO3 | 62 |
Scheme 2. Substrate scopes of pentafluoroarenes. Reaction conditions as shown in Table 1, entry 1. Regioselectivity was detected by crude GC. “Others” refers to ortho and meta regioisomers. a 42 h. b HCO2K (2.5 eq.) was used. c CsF (2.5 eq.), Cs2CO3 (1.5 eq.) were used. 30 h. d 48 h. e Cs2CO3 (2.5 eq.) was used as sole base. DMF (2 mL) and DMSO (300 μL) were used as co-solvent. 34 h.
Scheme 3. Substrate scope of trifluoroarenes. Reaction conditions: 3 (0.2 mmol, 1 eq.), [Ir(ppy)2](dtbbpy)]PF6 (2.5 mol%), DABCO (60 mol%), HCO2K (2.5 eq.), Cs2CO3 (2.5 eq.), DMF (2 mL), DMSO (300 μL), irradiated by 30 W blue LEDs at room temperature under CO2 (1 atm) for 38 h. Isolated yields. Single regioisomer was detected. a 32 h. b HCO2K (3 eq.) was used. c DMSO (2 mL) was used as sole solvent. 24 h. d [Ir(ppy)2](dtbbpy)]PF6 (2 mol%), DABCO (50 mol%) and HCO2K (2 eq.) were used. 32 h. e HCO2K (3.5 eq.) was used.
Scheme 4. Substrate scope of tetrafluoroarenes. Reaction conditions as shown in Table 1, entry 1. Regioselectivity was detected by crude GC. a HCO2K (3 eq.) was used.
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