A new, one-pot and three-component synthesis of 4H-pyrido [1, 2-a] pyrimidines, 4H-
pyrimido [1, 2-a] pyrimidines, and 4H-pyrazino [1, 2-a] pyrimidines is described. The reactive …

A novel, one-pot, three-component synthesis of 4H-pyrido [1, 2-a] pyrimidines is described.
The reactive 1: 1 zwitterionic intermediate, formed by the addition of isocyanides to dialkyl …

A new, efficient and easy route for the preparation of a series of 2‐alkyl (aryl) substituted 4‐
oxo‐4H‐pyrido‐[1, 2‐a] pyrimidines, where alkyl= CH3; aryl= C6H5, 4‐FC6H4, 4‐ClC6H4, 4 …

The synthesis of novel tricyclic fused pyrano [2, 3-d] pyrido [1, 2-a] pyrimidines containing
both biologically active pyridopyrimidine and pyranopyrimidine scaffolds, via the reaction of …

A protocol has been developed for the efficient synthesis of structurally diverse 3, 4-
dihydropyridin-2 (1 H)-ones and 3, 4-dihydro-2 H-pyrans via four-component reactions of …

Dihydropyrindines and tetrahydroquinolines, ie cyclopentyl and cyclohexyl annealed
pyridines, can be synthesized in good yields in a one-pot three-step four-component …

A novel, one step synthesis of pyrano [2, 3-b] pyri-dines from malononitrile and unsaturated
ketones is reported. The reaction mechanism is discussed and takes place through an …

benzyl‐5‐(ethoxycarbonyl)‐2, 3, 4, 5‐tetrahydropyridinium bromide undergoes ring
contraction with a series of nucleophiles, getting 2, 2‐disubstitued pyrrolidines. Moreover …

A convenient and efficient synthesis of highly functionalized dihydropyrido [2, 3-d]
pyrimidines via a double [5+ 1] annulation strategy starting from easily available α-alkenoyl …

Abstract As novel 1, 3-bis-electrophilic synthons, 1-benzotriazolyl-2-propynones provide
access to the fused ring systems of pyrido [1, 2-a] pyrimidin-2-ones and 2H-quinolizin-2 …