Reaktionen von Dinatrium‐dicyandithioacetat und Natrium‐dicyanthioacetamiden mit γ‐Bromcrotonsäure‐Derivaten

Reactions of Disodium Dicyanodithioacetate and Sodium Dicyanothioacetamides with Derivatives of γ‐Bromocrotonic Acid The dicyanodithioacetate 3 reacts with the derivatives of γ‐bromocrotonic acid 4a and 4b to give the thieno‐[2,3‐ b ]thiophenes 5a and 5b . 3 can also be alkylated successively with two different alkylating reagents. In this way the compounds 5c , 6a , and 6b are prepared. Reactions of the dicyanothioacetamides 8a and 8b with 4a and 4b yield the thiazolidines 9a – d .