The Diyne Reaction of 3, 3?-Bis(phenylethynyl)-2, 2?-bithiophene Derivativesvia Rhodium Complexes: A novel approach to condensed benzo[2, 1-b :3, 4-b?]dithiophenes
作者:Uwe Dahlmann、Richard Neidlein
DOI:10.1002/hlca.19970800111
日期:1997.2.10
benzo-fused benzo[2, 1-b:3, 4-b′]dithiophenes 1 and benzo[2, 1-b:3, 4-b′:5, 6-c″]trithiophenes 2 are described. The treatment of easily available 3, 3′-bis(phenylethynyl)-2, 2′-bithiophene derivatives 5a and 6 (via PdII-catalyzed alkynylation of the corresponding 3, 3′-dibromo-2, 2′-bithiophenes; see Scheme 1) with chlorotris-(triphenylphosphine)rhodium(I) yields the corresponding cyclic rhodium complexes
苯并稠合的苯并的合成[2,1- b:3,4- b ']二噻吩1和苯并[2,1- b:3,4- b ':5,6- ç “] trithiophenes 2中描述。易于获得的3,3'-双(苯基乙炔基)-2,2'-联噻吩衍生物5a和6的处理(通过Pd II催化的相应3,3'-dibromo-2,2'-联噻吩的炔基化反应;参见方案1)与三氯三(三苯基膦)铑(I)生成相应的环状铑络合物7(方案2)与乙炔和硫顺利反应,得到高收率的1和2(方案3-5)。