3-Amino-4-iodothiophenes are obtained by iodocyclization of 1,3-dithianyl substituted propargylamine derivatives through iodine induced cleavage of dithiane ring in a bicyclic sulfonium intermediate. 1-(1,3-Dithian-2-yl)propargylamines are readily available by Au-catalyzed reaction of 1,3-dithiane-2-carbaldehydes, amines, and alkynes in a one-pot.
3-氨基-4-碘噻吩是通过碘代环化1,3-二噻吩基取代炔丙胺衍生物通过碘诱导的双环锍中间体中的二噻烷环裂解获得的。1-(1,3-Dithian-2-yl) 炔丙胺很容易通过 1,3-二噻烷-2-甲醛、胺和炔烃在一锅中的 Au 催化反应获得。
Base-Mediated Rearrangement of α-Dithioacetyl Propargylamines via Expansion of Dithioacetyl Ring: Synthesis of Medium-Sized <i>S,S</i>-Heterocycles
Base-mediated rearrangement of 1,3-dithianyl-substituted propargylamines in DMF via expansion of the dithiane ring has been reported. The rearrangement provided 9-membered amino-functionalized sulfur-containing heterocycles (dithionine derivatives) in good yields under mild conditions. Propargylamines bearing 5-membered 1,3-dithiolane and 7-membered 1,3-dithiepane ringsrearranged in a similar manner