Synthesis of Thienothiopyranthiones by a New Molecular Rearrangement
作者:Vladimir A. Ogurtsov、Oleg A. Rakitin、Charles W. Rees、Alexey A. Smolentsev、Pavel A. Belyakov、Denis G. Golovanov、Konstantin A. Lyssenko
DOI:10.1021/ol0476669
日期:2005.3.1
On heating with alkynes, the readily prepared 1,3-dithioles 3 undergo a new cycloaddition reaction and an unprecedented molecular rearrangement with loss of chlorine to give the first 7H-thieno[2,3-c]thiopyran-7-thiones 4 and 4H-thieno[3,2-c]thiopyran-4-thiones 5 whose structures were confirmed by X-ray diffraction. Unexpectedly, the different alkynes used to form 3 and to convert it into 4 and 5 were