Morpholine → Ethyl 4-cyano-3-iodo-5-morpholin-4-ylthiophene-2-carboxylate

Participants

Reaction Conditions

Reaction Steps

To a 500 mL RBF containing ethyl 4-cyano-3-iodo-5-(methylsulfonyl)thiophene-2-carboxylate (17.20 g, 44.65 mmol, prepared as in WO 2009154741) was added anhydrous 1,4-dioxane (172.0 mL, 2204 mmol). To the resulting suspension was added morpholine (8.177 mL, 93.77 mmol). A reflux condenser was attached and the pink/orange heterogeneous suspension was heated to bath temp 90° C. and allowed to stir. Shortly after heating began, reaction mixture became a cherry red, homogenous solution. Reaction was stirred for 16 hours at 90° C. The reaction was then cooled to room temperature and diluted with water (100 mL). Mixture was filtered, and the solid was dried for in vacuo at 40° C. for 5 days to afford ethyl 4-cyano-3-iodo-5-morpholin-4-ylthiophene-2-carboxylate (14.3 grams, 82% yield). LCMS: (FA) ES+ 393; 1H NMR (400 MHz, DMSO) δ 4.24 (q, J=7.1, 2H), 3.78-3.70 (m, 4H), 3.63-3.57 (m, 4H), 1.26 (t, J=7.1, 3H).

Provenance & Evidence