title: A new route to annulated oligothiophenes.
abstract: [reaction: see text] A new convenient method for the construction of thiophene-annulated thieno[2,3-b]thiophenes has been proposed. The key step of the method is ring closure of 10H-bisthienodithiocin-10-one by strong bases. The syntheses of two previously unknown annulated oligothiophenes, thieno[2,3-b]thieno[3',2':4,5]thieno[3,2-d]thiophene (1a) and thieno[3,2-b]thieno[2',3':4,5]thieno[3,2-d]thiophene (1b), have been described to illustrate the success of the method.
authors.affiliation: Moscow State University, Department of Chemistry, Leninskie Gory, Moscow 119992, Russia. nen@acylium.chem.msu.ru
authors.forename: Valentine G
authors.initials: VG
authors.lastname: Nenajdenko
authors.forename: Viktor V
authors.initials: VV
authors.lastname: Sumerin
authors.forename: Konstantin Yu
authors.initials: KY
authors.lastname: Chernichenko
authors.forename: Elizabeth S
authors.initials: ES
authors.lastname: Balenkova