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Entry | Solvent | “N” source | “N” source/ equiv. | Time/h | t/℃ | Yield/% |
1 | — | NH4OAc | 3 | 26 | 120 | 79 |
2 | — | Ammonium formate | 3 | 26 | 120 | 18 |
3 | — | NH4Cl | 3 | 26 | 120 | 19 |
4 | — | Benzylamine | 3 | 26 | 120 | Trace |
5 | — | NH3•H2O | 3 | 26 | 120 | NR |
6 | DMSO | NH4OAc | 3 | 26 | 120 | NR |
7 | DMF | NH4OAc | 3 | 26 | 120 | NR |
8 | CH3CN | NH4OAc | 3 | 26 | 120 | 19 |
9 | PhMe | NH4OAc | 3 | 26 | 120 | 61 |
10 | — | NH4OAc | 1 | 26 | 120 | 20 |
11 | — | NH4OAc | 2 | 26 | 120 | 28 |
12 | — | NH4OAc | 4 | 26 | 120 | 71 |
13 | — | NH4OAc | 5 | 26 | 120 | 70 |
14 | — | NH4OAc | 3 | 26 | 40 | NR |
15 | — | NH4OAc | 3 | 26 | 80 | NR |
16 | — | NH4OAc | 3 | 26 | 100 | NR |
17 | — | NH4OAc | 3 | 26 | 110 | 50 |
18 | — | NH4OAc | 3 | 26 | 130 | 71 |
19 | — | NH4OAc | 3 | 4 | 120 | NR |
20 | — | NH4OAc | 3 | 6 | 120 | 20 |
21 | — | NH4OAc | 3 | 12 | 120 | 53 |
22 | — | NH4OAc | 3 | 20 | 120 | 60 |
23 | — | NH4OAc | 3 | 30 | 120 | 81 |
a Reaction conditions: 1a (1 mmol), 2a (1 mmol) and “N” source at the indicated amount in a sealed tube at the indicated reaction time and temperatures. |
Citation: Ding Yuxin, Ma Yongmin, Chen Jing. Novel Three-Component Annulation for the Synthesis of 2, 4, 6-Triaryl-pyrimidines under Solvent-Free and Catalyst-Free Conditions[J]. Chinese Journal of Organic Chemistry, 2020, 40(12): 4357-4363. doi: 10.6023/cjoc202005078
无溶剂无催化剂条件下三组分一锅合成2, 4, 6-三芳基嘧啶衍生物的新方法
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关键词:
- 无催化剂
- / 无溶剂
- / 一锅法
- / 三组分反应
- / 2, 4, 6-三芳基嘧啶
English
Novel Three-Component Annulation for the Synthesis of 2, 4, 6-Triaryl-pyrimidines under Solvent-Free and Catalyst-Free Conditions
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Key words:
- catalyst-free
- / solvent-free
- / one-pot
- / three-component reaction
- / 2, 4, 6-triarylpyrimidine
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[1]
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表 1 反应条件的优化a
Table 1. Optimization of the reaction conditions
表 2 反应底物拓展a, b
Table 2. Scope of the substrates
Entry Product Ar1 Ar2 Ar3 Yieldb/% 1 3aa Ph Ph Ph 79, 75c 2 3ab Ph Ph 2-ClC6H4 60 3 3ac Ph Ph 2-BrC6H4 59 4 3ad Ph Ph 3-MeC6H4 81 5 3ae Ph Ph 3-MeOC6H4 51 6 3af Ph Ph 3-BrC6H4 80 7 3ag Ph Ph 4-MeC6H4 84 8 3ah Ph Ph 4-NO2C6H4 0 9 3ai Ph Ph 4-FC6H4 81 10 3aj Ph Ph 4-ClC6H4 86 11 3ak Ph Ph 4-BrC6H4 85 12 3ba 4-MeC6H4 Ph Ph 83 13 3ca 4-ClC6H4 Ph Ph 84 14 3da 4-BrC6H4 Ph Ph 81 15 3ea 3-ClC6H4 Ph Ph 79 16 3fa 4-MeC6H4 4-MeC6H4 Ph 85 17 3ga 4-FC6H4 4-FC6H4 Ph 81 18 3ha 4-ClC6H4 4-ClC6H4 Ph 85 19 3ia 4-BrC6H4 4-BrC6H4 Ph 86 20 3ja 4-ClC6H4 4-MeC6H4 Ph 82 21 3ka 3-FC6H4 3-FC6H4 Ph 82 22 3la 3-ClC6H4 3-ClC6H4 Ph 83 23 3ma 3-BrC6H4 3-BrC6H4 Ph 80 24 3na 2-MeC6H4 2-MeC6H4 Ph 0 25 3oa 2-FC6H4 2-FC6H4 Ph 0 26 3pa 2-ClC6H4 2-ClC6H4 Ph 0 27 3kl 3-FC6H4 3-FC6H4 3-FC6H4 80 a Reaction condiions: 1 (1 mmol), 2 (1 mmol) and NH4OAc (3 mmol), 120 ℃, 26 h; b Isolated yield; c10 mmol scale.
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