Diethyl 2,7-dibromo-4H,5H- thieno[3,2-b:4,5-b']dipyrrole-3,6- dicarboxylate: a key intermediate for a diversity oriented synthesis of 2,7,12,17-tetraarylporphycenes.
A new Suzuki-based strategy for the synthesis of 4,4'-diaryl (or heteroaryl)-substituted 2,2'-bipyrroles (10), precursors of 2,7,12,17-tetraaryl (or heteroaryl)-substituted porphycenes, is described. Bromination of the previously described diethyl 4H,5H-thieno[3,2-b:4,5-b']dipyrrole-3,6-dicarboxylate afforded dibromo compound 19, which is the key intermediate of such strategy.
Grup d'Enginyeria Molecular, Institut Químic de Sarrià, Universitat Ramon Llull, Via Augusta, 390, E-08017 Barcelona, Spain.
Ofir
O
Arad
Jordi
J
Morros
Xavier
X
Batllori
Jordi
J
Teixidó
Santiago
S
Nonell
José I
JI
Borrell