- Microwave-Assisted Formylations of Weakly Basic Anilines with Methyl Formate Catalyzed by Calcium and Hydrogen Triflimides
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Catalytic amounts of calcium and hydrogen triflimides [Ca(NTf2)2, HNTf2] were found to be efficient for the solvent-free formylation of a variety of weakly basic anilines by using cheap and widely available methyl formate as the formylating agent under microwave irradiation. Initial investigations showed that in the case of calcium triflimide, Br?nsted acid catalysis was most likely operating. Remarkably, the corresponding calcium triflate and triflic acid were significantly less active.
- Tan, Eric,Ung, Sosthène,Corbet, Matthieu
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- Chirality sensing of tertiary alcohols by a novel strong hydrogen-bonding donor-selenourea
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Chemical sensors are powerful for the fast recognition of chiral compounds. However, the established sensing systems are less effective for chiral tertiary alcohols. The chiral tertiary alcohol group is an important structural unit in natural products and drug molecules, and its enantioselective recognition represents a significant and challenging task. In this paper, a novel type of chiral bisselenourea sensor was first synthesized and used as a strong hydrogen-bonding donor for highly efficient chiral recognition of a diverse range of tertiary alcohols. The obtained sharply split NMR signals are well-distinguishable with a large (up to 0.415 ppm) chemical shift nonequivalence. The NMR signal of the hydroxyl hydrogen atom was first employed for enantiomeric excess determination of tertiary alcohols, giving accurate results with 1H NMR spectrum.
- Bian, Guangling,Yang, Shiwei,Huang, Huayin,Zong, Hua,Song, Ling,Fan, Hongjun,Sun, Xiaoqiang
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- KOtBu-Promoted Transition-Metal-Free Transamidation of Primary and Tertiary Amides with Amines
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This work discloses transamidation of primary and tertiary amides with a range of aryl, heteroaryl, and aliphatic amines using potassium tert-butoxide. The reaction proceeds at room temperature under transition-metal-free conditions providing secondary amides in high yields. Moreover, reaction of cyclopropyl amine with tertiary amides proceeds with ring-opening to provide a rapid access to enamides.
- Ghosh, Tridev,Jana, Snehasish,Dash, Jyotirmayee
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supporting information
p. 6690 - 6694
(2019/09/12)
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- Chiral selenourea compound, preparation and application thereof
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The invention discloses a chiral compound with a selenourea group structure, and also provides a preparation method and application of the selenourea chiral compound. The structure of the new compound is shown as the specification. The compound is used as a chiral shift reagent to detect the optical purity of chiral carboxylic acid, chiral alcohol, chiral amino alcohol and other chiral compounds, has the characteristics of simple operation and large chemical shift difference, thus being a rapid, efficient, convenient and practical detection means.
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Paragraph 0024; 0025
(2017/05/12)
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- FORMYLATION PROCESS FOR PREPARING AROMATIC FORMAMIDES
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The present invention mainly pertains to a catalytic process for preparing a formamide,comprising reacting a formic acid ester with an aromatic amine carrying at least one electron withdrawing group in the presence of a catalyst of fluorine-containing sulfonimide metal salt.
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Paragraph 0056-0058
(2016/04/26)
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