Cyclization of 2-dimethylaminomethylene-1,3-bis(dimethylimonio)propane diperchlorate with various amino heterocycles led to the formation of a series of fused heterocyclic systems containing a 3-formylpyridine or 5-formylpyrimidine unit.
A formal [3 + 2] cycloaddition between ynamides and unprotected isoxazol-5-amines has been developed in the presence of catalytic AgNTf2 in an open flask. By the protocol, a variety of functionalized 5-amino-1H-pyrrole-3-carboxamide derivatives can be obtained in up to 99% yield. The reaction mechanism might involve the generation of an unusual α-imino silver carbene intermediate (or a silver-stabilized
chemoselective reaction between 5-aminoisoxazoles and α-diazocarbonyl compounds has been described. Both Wolff rearrangement and N–H insertion products can be obtained selectively by the judicious choice of reaction conditions. In the case of the Wolff rearrangementreactions, the N-isoxazole amides are accessed as the sole products under thermal conditions. On the other hand, α-amino acid derivatives
The study of reactions of α-chlorocinnamonitriles with hydroxylamine
作者:V. G. Nenajdenko、I. V. Golubinskii、O. N. Lenkova、A. V. Shastin、E. S. Balenkova
DOI:10.1007/s11172-006-0029-1
日期:2005.7
The E-isomers of α-chlorocinnamonitriles react with hydroxylamine to give a mixture of isomeric aminoisoxazoles, while the Z-isomers yield 3-aryl-2-chloroacrylamide oximes.
α-氯肉桂腈的E异构体与羟胺反应生成一 mixture of isomeric aminoisoxazoles,而Z异构体则产生3-芳基-2-氯丙烯酰胺肟。
Domino Reactions of Chromone-3-carboxylic Acids with Aminoheterocycles: Synthesis of Heteroannulated Pyrido[2,3-<i>c</i>
]coumarins and their Optical and Biological Activity
A variety of new heteroannulated pyrido[2,3‐c]coumarins have been prepared by the domino reactions of chromone‐3‐carboxylic acids with aminoheterocycles