An efficient route is reported for the synthesis of derivatives of the thieno [3′,2′: 4,5][1]benzothieno[2,3-d]pyrimidine system 6 with a substituent (oxygen atom or amino group) in the bay region. These molecules are shown by extensive MM calculations to show a significant degree of helical distortion.
S. Bhattacharya, A. De and D. F. Ewing, J. Chem. Soc., Perkin Trans. 1, 1994, 689 DOI: 10.1039/P19940000689
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