A new and convenient route for the synthesis of the thieno[3,2‐e]indolizines 4a,b,d, the thieno[2,3‐c]quinolizine 4e and their benzothieno analogues 9a,b is presented. Reaction of the (dialkylamino)thiophenes 1, 5 and 7 with (methoxymethylene)malononitrile (2) gives the Michael adducts 3, 6 and 8. Heating of 3 and 8 in refluxing 1‐butanol gives the cyclized products 4 and 9. This cyclization proceeds via a 1,5 hydrogen shift, followed by an intramolecular addition of the carbanion to the iminium double bond in the intermediate 10 formed. The scope and limitations of this approach are discussed.