Multi-membered N-heterocycles R 0690Tetrahydropyridine (THP) Ring Expansion under the Action of Activated Terminal Alkynes. The First Synthesis and X-Ray Crystal Structure of Tetrahydropyrimido[4,5-d]azocines. -Piperidines of type (I) and (VI) anellated with pyrimidinones readily undergo a new, alkyne-induced ring enlargement reaction to yield novel, biologically interesting target compounds. -(VOSKRESSENSKY*, L. G.; BORISOVA, T. N.; KOSTENEV, I. S.; KULIKOVA, L. N.; VARLAMOV, A. V.; Tetrahedron Lett. 47 (2006) 6, 999-1001; Org. Chem. Dep., Russ. Peoples' Friendship Univ., Moscow 117198, Russia; Eng.) -Mais 20-168
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