Aqueous Compatible Protocol to Both Alkyl and Aryl Thioamide Synthesis
作者:Jianpeng Wei、Yiming Li、Xuefeng Jiang
DOI:10.1021/acs.orglett.5b03541
日期:2016.1.15
An efficient aqueous synthesis of thioamides through aldehydes, sodium sulfide, and N-substituted formamides has been developed. Both alkyl and aryl aldehydes are amenable to this protocol. N-Substituted formamides are essential for this transformation. Readily available inorganic salt (sodium sulfide) serves as the sulfur source in water, which makes this method much more practical and efficient.
Potassium<i>tert</i>-Butoxide-Mediated Amine Acyl Exchange Reaction of<i>N,N</i>-Disubstituted Formamides with Aromatic Carbonyl Derivatives<i>via</i>Sequential CN Bond Cleavage/Formation: an Approach to Aromatic Amides
A novel potassium tert‐butoxide‐mediated amine acyl exchange of N,N‐disubstituted formamides with aromatic carbonyl derivatives in a sequential CN bond cleavage/formation process leading to aromatic amides is described. This methodology tolerates a wide range of aromatic carbonylcompounds, including aromatic aldehydes, acyl chlorides, unactivated esters, and acid anhydrides. The usage of inexpensive
Convenient<i>N</i>-Formylation of Secondary Amines: KF-Al<sub>2</sub>O<sub>3</sub>-Promoted Synthesis of Formamide Derivatives via Dichlorocarbene Generated from Chloroform
The treatment of secondary amines with chloroform in the presence of KF-Al 2 O 3 in acetonitrile brought about highly facile and efficient N-formylation to give the corresponding formamides in good to excellent yields. TheN-formylation reaction not only involves mild conditions, simple operations and high yields but high chemoselectivity as well.
在 KF-Al 2 O 3 的存在下,在乙腈中用氯仿处理仲胺,可以非常容易和有效地进行 N-甲酰化,从而以良好的收率得到相应的甲酰胺。N-甲酰化反应不仅条件温和、操作简单、收率高,而且化学选择性高。
Bisphosphonic acid derivatives, their production and use
申请人:Leo Pharmaceutical Products Ltd. A/S
公开号:US04870063A1
公开(公告)日:1989-09-26
Novel compounds of the formula I ##STR1## in which R.sub.1 -R.sub.11 can be the same or different and stand for hydrogen, a straight or branced aliphatic or alicyclic C.sub.1 -C.sub.10 hydrocarbon radical, an aryl or an aryl-C.sub.1 -C.sub.4 -alkyl radical; n is zero or one, and m is zero, one or two; or R.sub.2 and R.sub.4 when taken together form a saturated aliphatic 5-, 6- or 7-membered ring which may be substituted with one or more C.sub.1 -C.sub.4 alkyl radicals; and pharmaceutically acceptable salts and easily hydroyzable esters thereof, methods for producing said new compounds, pharmaceutical compositions containing the new compounds, dosage units of the compositions, and methods of treating patients using said compositions and dosage units. The present compounds are valuable in the human and veterinary practice by reducing bone resorption and surprisingly also stimulating bone alkaline phosphatase. A substantial increase in bone mass is actually observed during treatment with the present compounds.
Turning hazardous red mud into useful catalysts for the carbonylation of amines to N-formamides
作者:Dilong Chen、Yuxiao Ding、Chungu Xia、Lin He、Yanwei Cao
DOI:10.1016/j.mcat.2022.112761
日期:2022.12
dispose of red mud is regarded worldwide as an urgent requirement. Herein, a facile utilization of the bases in hazardous red mud to catalyze the carbonylation of amines to N-formamides is reported. This catalytic system can achieve 99% conversion of amines with 100% selectivity for N-formamides. Gram-scale preparation of useful formamides, such as N,N-dimethylformamide (DMF) and N-formylmorpholine was