A straightforward synthesis of methylenebisamides from amides and DMSO with a substoichiometric amount of (COCl)2
作者:Hao Wang、Sen Liang、Yutong Wang、Shuai Peng、Yongguo Liu、Baoguo Sun、Hongyu Tian、Ning Li
DOI:10.1016/j.molstruc.2022.133184
日期:2022.9
The preparation of methylenebisamides has been achieved by the reaction of amides with dimethyl sulfoxide (DMSO) in the presence of a substoichiometric amount of (COCl)2 in toluene at reflux. Various amides, including aliphatic and aryl amides, lactams, and carbamates, can be converted to the corresponding methylenebisamides in good to high yields. It is proposed that HCHO generated in situ from the
A novel and efficient fragment-based assembly of symmetrical bis-peptidotraizoles has been developed based on double Sharpless azide–alkyne click chemistry. A new Cu(II) catalyzedprotocol with a wide substrate scope was developed for accessing the symmetrical alkylidene bis-azidoamide fragment that yields the products in very good yields at room temperature without employing column purifications.
Acid-catalyzed Reactions of Nitriles. I. The Reaction of Nitriles with Formaldehyde<sup>1</sup>
作者:Eugene E. Magat、Burt F. Faris、John E. Reith、L. Frank Salisbury
DOI:10.1021/ja01147a042
日期:1951.3
An Improved Synthesis of Symmetrical N,N′-Alkylidene-bis-amides
作者:Everett R. GILBERT
DOI:10.1055/s-1972-21820
日期:——
MULTIPLE MODIFIED DERIVATIVES OF GELATIN AND CROSSLINKED MATERIAL THEREOF
申请人:Song Chan
公开号:US20090306345A1
公开(公告)日:2009-12-10
The disclosed is a kind of multiple modified derivatives of gelatin having not only the structure of formula (I) but also one of structures of formula (II), (III), and (IV) as well. Wherein, G refers to gelatin residue comprising type A, type B and the type of gene recombination; R
1
refers to alkylene, or a linkage group with amide; R
2
refers to alkyl, or aryl; R
3
refers to alkylene; R
4
refers to carboxyl or carboxylate. The multiple modifying ways of gelatin comprise the hydrophobic modification on the amino group of gelatin through amide bond, carboxylation on the amino group of gelatin through amide bond, thiolation on the carboxyl group of gelatin, and thiolation following carboxylation on amino group of gelatin through amide bond. In addition, the invention also discloses the crosslinked material made of multiple modified derivatives of gelatin. The multiple modified derivatives of gelatin have flexible chemical structures and many properties. Their crosslinked gelatin material can be used the matrix for cell growth etc.