Chinese Journal of Catalysis ›› 2022, Vol. 43 ›› Issue (7): 1652-1656.DOI: 10.1016/S1872-2067(21)63956-6
• Special column on catalytic conversion of CO2 • Previous Articles Next Articles
Yaping Yia, Chanjuan Xia,b,*()
Received:
2021-08-05
Accepted:
2021-10-08
Online:
2022-07-18
Published:
2022-05-20
Contact:
Chanjuan Xi
Supported by:
Yaping Yi, Chanjuan Xi. Photo-catalyzed sequential dearomatization/carboxylation of benzyl o-halogenated aryl ether with CO2 leading to spirocyclic carboxylic acids[J]. Chinese Journal of Catalysis, 2022, 43(7): 1652-1656.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(21)63956-6
Entry | Deviation | Yield of 2a a (%) |
1 | None | 76 (66) |
2 | DMF instead of DMSO | 22 |
3 | MeCN instead of DMSO | N.D. |
4 | Ir[dF(CF3)ppy]2(dtbpy)PF6 instead of 4CzIPN | 70 |
5 | Ru(bpy)3Cl2·6H2O instead of 4CzIPN | 40 |
6 | Et3N instead of DIPEA | 43 |
7 | Cy2NMe instead of DIPEA | 12 |
8 | Cs2CO3 instead of t-BuONa | 64 |
9 | 2.0 equiv. of DIPEA | 67 |
10 | 2.0 equiv. of t-BuONa | 68 |
11 | 4CzIPN (2.5 mol%) | 55 |
12 | without CO2 | N.D. |
13 | without light | N.D. |
14 | without 4CzIPN | N.D. |
15 | without DIPEA | N.D. |
16 | without t-BuONa | 20 |
17 | Br instead of I in 1a | 9 |
18 | Cl instead of I in 1a | 2 |
Table 1 Optimization of Reaction Conditions.
Entry | Deviation | Yield of 2a a (%) |
1 | None | 76 (66) |
2 | DMF instead of DMSO | 22 |
3 | MeCN instead of DMSO | N.D. |
4 | Ir[dF(CF3)ppy]2(dtbpy)PF6 instead of 4CzIPN | 70 |
5 | Ru(bpy)3Cl2·6H2O instead of 4CzIPN | 40 |
6 | Et3N instead of DIPEA | 43 |
7 | Cy2NMe instead of DIPEA | 12 |
8 | Cs2CO3 instead of t-BuONa | 64 |
9 | 2.0 equiv. of DIPEA | 67 |
10 | 2.0 equiv. of t-BuONa | 68 |
11 | 4CzIPN (2.5 mol%) | 55 |
12 | without CO2 | N.D. |
13 | without light | N.D. |
14 | without 4CzIPN | N.D. |
15 | without DIPEA | N.D. |
16 | without t-BuONa | 20 |
17 | Br instead of I in 1a | 9 |
18 | Cl instead of I in 1a | 2 |
Scheme 1. Evaluation of substrate scope. Reaction conditions: 1a (0.2 mmol), 4CzIPN (5 mol%), DIPEA (0.6 mmol), t-BuONa (0.6 mmol), DMSO (2.0 mL), 1 atm CO2, 5 W Blue LED, room temperature, 12 h, quenched by HCl (2 mol/L), isolated yield. a The reaction time is extended to 24 h. b Quenched by HCl (2 mol/L), extraction, then TMSCHN2 (2.0 equiv. in 1.0 mL MeOH/Et2O, v/v = 1:1).
Scheme 2. Mechanism studies. (a) TEMPO was added in the reaction. (b) The reaction was treated without CO2 under N2 and the reaction mixture was quenched by the D2O. (c) Using DCl (2 mol/L) further quenched the reaction. (d) Stern-Volmer fluorescence quenching experiments.
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