Free radical cyclization of 1,3-dicarbonyl compounds mediated by manganese(III) acetate with alkynes and synthesis of tetrahydrobenzofurans, naphthalene, and trifluoroacetyl substituted aromatic compounds

摘要

Furan derivatives were obtained from radical cyclizations of 1,3-dicarbonyl compounds mediated by Mn(OAc)(3) with phenyl acetylene 2a (14-66% yields). Naphthalene derivates 4a and 4b were produced in the treatments with 2a. In addition to these, trifluoroacetyl substituted naphthalene 4c, benzofuran 4d, and benzothien 4e were obtained in the reactions of trifluoromethyl-1,3-dicarbonyls (1 g-i) with 2a.