Synthetic applications of N-N linked heterocycles. Part 8. Regiospecific synthesis of 4-(α-acylalkyl)pyridines by attack of lithium enolates of ketones γ to N-(2,6-dimethyl-4-oxopyridin-1-yl)pyridinium salts
作者:Cheuk Man Lee、Michael P. Sammes、Alan R. Katritzky
DOI:10.1039/p19800002458
日期:——
salts (2)–(4) to lithium enolates (1) of ketones in tetrahydrofuran at low temperatures gives regiospecifically high yields of 1,4-dihydro-adducts (5)–(7). These are readily isolated and can be decomposed under free-radical conditions, also in high yield, to 4-(α-acylalkyl)pyridines (8)–(10). Unsymmetrical dialkyl ketones give a mixture of two isomeric products, the ratio depending upon reaction conditions
The present invention provides compounds that modulate the activity of Janus kinases and are useful in the treatment of diseases related to activity of Janus kinases including, for example, immune-related diseases and cancer.