No abstract

No abstract

No abstract

The lanthanide complexes L 2 Ln(NO 3 ) 3 (3) and L 3 [Ln(NO 3 ) 3 ] 2 (5) (Stewart and Siddall III. J Inorg Nucl Chem 1971, 33, 2965-2970

The Homer-Wadsworth-Emmons (HWE) reaction of the diethyl ester of 2-amino-2-oxoethylphosphonic acid 1 as well as of diethyl ester of the 2-dimethylamino-2-oxoethylphosphonic acid 2 with some aldehydes and ketones 3 in liquid-solid two phase system is used for the preparation of a$-unsaturated amides 4, 5. The synthesis is carried out in mild conditions (room temperature, KOH, K2C03. CaO) in the absence of a catalyst or in the absence of a solvent, and leads in very high (E)-stereoselectivity and in high yields to en-amides.Keywords: Diethyl ester of 2-amino-2-oxoethylphosphonic acid; diethyl ester of 2-diethylamino-2-oxoethylphosphonic acid; Homer-Wadsworth-Emrnons reaction; a,b-unsaturated amides; solid-liquid two phase system