26173-92-2Relevant articles and documents
Facile synthesis of pyrazoles and pyrroles via thermolysis of tetrazolo[1,5-b]pyridazines, tetrazolo[1,5-a]pyrimidines and tetrazolo [1,5- a]pyridines
Simoni, Daniele,Rondanin, Riccardo,Furnò, Giancarlo,Aiello, Enrico,Invidiata, Francesco Paolo
, p. 2699 - 2703 (2000)
A simple and high yielding preparation of pyrazoles and pyrroles is described. Thermolysis of tetrazolo[1,5b]pyridazines, tetrazolo[1,5- a]pyrimidines and tetrazolo[1,5-a]pyridines allowed easy ring contraction thus providing a facile preparation of cyano
Unusual oxidation in the course of synthesis of V-confused nickel tetrahydrobilins
Damke, Jan-Erik,Koenig, Torben,Haake, Gerold,Latos-Grazynski, Lechoslaw,Monltorls, Franz-Peter
experimental part, p. 1503 - 1514 (2011/06/17)
TV-confused Tetrahydrobilins rac-16 and rac-17 were prepared to investigate their cyclization directed to the formation of N-confused chlorins. For achieving the desired cyclization the 5'-position of rac-16 respectively rac-17 was activated by an electron withdrawing cyano function and their 2'-positions were blocked by a methyl group. In addition, the insertion of Ni(II) was accomplished for exercising a template effect during the cyclization process, but the formed nickel complexes rac-18 and rac-19 underwent oxidation to yield oxo-tetrahydrobilins rac-20 and rac-21. The Japan Institute of Heterocyclic Chemistry.