87361-41-9Relevant articles and documents
C-Silyl Derivatives of Quinolizines
Birkofer, Leonhard,Wahle, Bernd
, p. 2564 - 2573 (2007/10/02)
The cycloaddition of dimethyl acetylenedicarboxylate (1) to the C-silylated pyridines 2b - f leads to the corresponding partially very labile C-silylated tetramethyl 9aH-quinolizine-1,2,3,4-tetracarboxylates 3b - j, which are rearranged into the isomeric tetramethyl C-silyl-4H-quinolizine-1,2,3,4-tetracarboxylates 4b - g.From 4b - d the silylated dimethyl 3-methoxalyl-4-oxo-4H-quinolizine-1,2-dicarboxylates 6b - d are formed via the quinolizinium perchlorates, from which the perchlorate 5b was isolated.