Chinese Journal of Catalysis ›› 2024, Vol. 60: 171-177.DOI: 10.1016/S1872-2067(23)64623-6
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Zhi-Peng Baoa,b, Nai-Xian Suna,c, Xiao-Feng Wua,b,*()
Received:
2024-01-20
Accepted:
2024-02-07
Online:
2024-05-18
Published:
2024-05-22
Contact:
E-mail: Supported by:
Zhi-Peng Bao, Nai-Xian Sun, Xiao-Feng Wu. A general palladium-catalyzed carbonylative synthesis of α-CF3-substituted ketones and carboxylic acid derivatives[J]. Chinese Journal of Catalysis, 2024, 60: 171-177.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(23)64623-6
Entry | Catalyst/Ligand | Base | Yield b (%) |
---|---|---|---|
1 | Pd(OAc)2/PPh3 | Na2CO3 | 38 |
2 | Pd(acac)2/PPh3 | Na2CO3 | 42 |
3 | PdI2/PPh3 | Na2CO3 | 43 |
4 | PdI2/TFP | Na2CO3 | 38 |
5 | PdI2/DPEphos | Na2CO3 | 51 |
6 | PdI2/Sphos | Na2CO3 | 56 |
7 | PdI2/Xphos | Na2CO3 | 13 |
8 | PdI2/Ruphos | Na2CO3 | 34 |
9 | PdI2/Sphos | Na2CO3 | 47 |
10 | PdI2/Sphos | K2CO3 | 52 |
11 | PdI2/Sphos | Cs2CO3 | 38 |
12 | PdI2/Sphos | NEt3 | 64 |
13 | PdI2/Sphos | DiPEA | 78 |
14c | PdI2/Sphos | DiPEA | 82 |
15c,d | PdI2/Sphos | DiPEA | 60 |
16c,e | PdI2/Sphos | DiPEA | 51 |
Table 1 Optimization of the reaction conditions a.
Entry | Catalyst/Ligand | Base | Yield b (%) |
---|---|---|---|
1 | Pd(OAc)2/PPh3 | Na2CO3 | 38 |
2 | Pd(acac)2/PPh3 | Na2CO3 | 42 |
3 | PdI2/PPh3 | Na2CO3 | 43 |
4 | PdI2/TFP | Na2CO3 | 38 |
5 | PdI2/DPEphos | Na2CO3 | 51 |
6 | PdI2/Sphos | Na2CO3 | 56 |
7 | PdI2/Xphos | Na2CO3 | 13 |
8 | PdI2/Ruphos | Na2CO3 | 34 |
9 | PdI2/Sphos | Na2CO3 | 47 |
10 | PdI2/Sphos | K2CO3 | 52 |
11 | PdI2/Sphos | Cs2CO3 | 38 |
12 | PdI2/Sphos | NEt3 | 64 |
13 | PdI2/Sphos | DiPEA | 78 |
14c | PdI2/Sphos | DiPEA | 82 |
15c,d | PdI2/Sphos | DiPEA | 60 |
16c,e | PdI2/Sphos | DiPEA | 51 |
Fig. 3. Substrate scope of amines, phenols, alcohols, arylboronic acids and trifluoromethylated secondary alkyl iodides. a Reaction conditions: 1a (0.3 mmol), 2 (2.5 equiv.), PdI2 (5 mol%), Sphos (11 mol%), DiPEA (1.5 equiv.), CO (20 bar), MeCN (1.5 mL), 80 °C for 24 h, isolated yield. b Arylboronic acids (0.3 mmol), 2a (3 equiv.), PdI2 (2.5 mol%), Sphos (6 mol%), K2CO3 (1.5 equiv.), CO (20 bar), PhCF3 (1.5 mL), H2O (20 μL), 80 °C for 24 h. c 0.15 mmol scale.
Fig. 4. Late-stage trifluoropropionylation of densely functionalized pharmaceutical agents and natural products. a Reaction conditions: nucleophiles (0.3 mmol), 2-Iodo-1,1,1-trifluoroethane (0.75 mmol), PdI2 (5 mol%), Sphos (11 mol%), DiPEA (0.45 mmol), CO (20 bar), MeCN (1.5 mL), 80 °C for 24 h, isolated yield. b DiPEA (0.75 mmol), the corresponding amine hydrochloride salts were used.
Fig. 5. (A) Less-nucleophilic reagents. (B) Scale-up preparation and synthetic transformation. (C) Competition between N-nucleophile and O-nucleophile under standard condition. (D) Radical inhibition experiments. (E) Radical capture experiment.
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