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Synthesis 2016; 48(23): 4126-4130
DOI: 10.1055/s-0035-1562531
DOI: 10.1055/s-0035-1562531
paper
A Convenient Synthesis of Dithieno[3,2-b:2′,3′-d]thiophenes from Thiophene
Weitere Informationen
Publikationsverlauf
Received: 07. Juni 2016
Accepted after revision: 15. Juli 2016
Publikationsdatum:
24. August 2016 (online)
![](https://www.thieme-connect.de/media/synthesis/201623/lookinside/thumbnails/ss-2016-f0414-op_10-1055_s-0035-1562531-1.jpg)
Abstract
A new synthetic method for dithieno[3,2-b:2′,3′-d]thiophenes was developed. The approach involves three steps starting from thiophene: tetraiodation of thiophene, selective dialkynylations on the 2,5-positions of the tetraiodothiophene, and finally CuI/TMEDA catalyzed double annulations of 2,5-dialkynyl-3,4-diiodothiophenes by Na2S, to afford dithieno[3,2-b:2′,3′-d]thiophene and its derivatives.
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