3,4-Diaminopyridine derivatives corresponding to a specified formula are produced by (a) reacting 3,4-diaminopyridine with a 1,2-dicarbonyl compound to form a diimine; (b) reducing the diimine to a diamine; and (c) replacing at least a hydrogen atom on nitrogen at position 4 of the pyridine ring. These compounds are useful as catalysts.
Annelated Pyridine Bases for the Selective Acylation of 1,2‐Diols
作者:Stefanie Mayr、Hendrik Zipse
DOI:10.1002/ejoc.202101521
日期:2022.8.5
The acylation of primary over secondary hydroxyl groups in 1,2-ethanediols depends strongly on size effects and noncovalent interactions between the alcohol side chains and the catalysts surface.
3,4-diaminopyridine derivatives for use as catalysts
申请人:Bayer MaterialScience AG
公开号:US07994169B2
公开(公告)日:2011-08-09
The present invention relates to 3,4-diaminopyridine derivatives of formula (I)
wherein
R1 and R2 are, independently of each other, electron donors, wherein R2 is optionally H; and
R3, R4, R5, and R6 are, independently of each other, H, optionally substituted straight-chain or branched alkyl, alkenyl, alkynyl, alkoxyl, or aryl, wherein R3 and/or R4 together with R5 and/or R6, optionally define a ring;
processes for their preparation, and their use as catalysts.