Metal-Free Synthesis of Carbamoylated Chroman-4-Ones via Cascade Radical Annulation of 2-(Allyloxy)arylaldehydes with Oxamic Acids
Abstract
:1. Introduction
2. Results and Discussion
3. Materials and Methods
3.1. General Information
3.2. General Procedure for the Preparation of Carbamoylated Chroman-4-Ones
3.3. Gram-Scale Synthesis of 3aa
3.4. Characterization Data of Products 3aa–3qa and 3ab–3an
4. Conclusions
Supplementary Materials
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
Sample Availability
References
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Entry | Oxidant | Solvent | Temp | Yield of 3aa b |
---|---|---|---|---|
1 | (NH4)2S2O8 | DMSO | 70 | 78% |
2 | (NH4)2S2O8 | CH3CN | 70 | 0% |
3 | (NH4)2S2O8 | DMF | 70 | 0% |
4 | (NH4)2S2O8 | DCE | 70 | 0% |
5 | (NH4)2S2O8 | THF | 70 | 0% |
6 | (NH4)2S2O8 | H2O | 70 | 0% |
7 | (NH4)2S2O8 | Acetone | 70 | 0% |
8 | K2S2O8 | DMSO | 70 | 0% |
9 | Na2S2O8 | DMSO | 70 | 0% |
10 | TBHP | DMSO | 70 | 0% |
11 | Selectfluor | DMSO | 70 | 0% |
12 | PhI(OAc)2 | DMSO | 70 | 0% |
13 | (NH4)2S2O8 | DMSO | 60 | 81% |
14 | (NH4)2S2O8 | DMSO | 50 | 53% |
15 | (NH4)2S2O8 | DMSO | 80 | 72% |
16 c | (NH4)2S2O8 | DMSO | 60 | 67% |
17 d | (NH4)2S2O8 | DMSO | 60 | 71% |
18 e | (NH4)2S2O8 | DMSO | 60 | 68% |
19 | DMSO | 60 | 0% |
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Xie, L.-Y.; Peng, S.; Yang, L.-H.; Liu, X.-W. Metal-Free Synthesis of Carbamoylated Chroman-4-Ones via Cascade Radical Annulation of 2-(Allyloxy)arylaldehydes with Oxamic Acids. Molecules 2022, 27, 7049. https://doi.org/10.3390/molecules27207049
Xie L-Y, Peng S, Yang L-H, Liu X-W. Metal-Free Synthesis of Carbamoylated Chroman-4-Ones via Cascade Radical Annulation of 2-(Allyloxy)arylaldehydes with Oxamic Acids. Molecules. 2022; 27(20):7049. https://doi.org/10.3390/molecules27207049
Chicago/Turabian StyleXie, Long-Yong, Sha Peng, Li-Hua Yang, and Xiao-Wen Liu. 2022. "Metal-Free Synthesis of Carbamoylated Chroman-4-Ones via Cascade Radical Annulation of 2-(Allyloxy)arylaldehydes with Oxamic Acids" Molecules 27, no. 20: 7049. https://doi.org/10.3390/molecules27207049