Synthesis of benzofuro (3-2b) benzofuran and benzofuro (2,3-b) benzofuran derivatives by transposition of Claisen acido catalyses
Written by sctunisie no commentsClaisen rearrangement of 1,4-diaryloxy 2-butynes in the presence of protonic acid yields first derivates of benzofuro (3,2-b) benzofuran. These products could be transformed to their isomers: derivates of benzofuro (2,3-b) benzofuran by an acidic catalysed shift. A mechanism is proposed for this reaction.
M. Rammah, B. Laude
Pages 3-13
