Chloromethyl Methyl Ether → methyl 5-bromo-6-cyclohexyl-4-(methoxymethyl)-4H-thieno[3,2-b]pyrrole-2-carboxylate

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Reaction Steps

Methyl 5-bromo-6-cyclohexyl-4H-thieno[3,2-b]pyrrole-2-carboxylate (prepared as in Example 7, Step 1) was dissolved in DMF and sodium hydride (1.4 eq.) was added. The mixture was stirred at RT until evolution of gas had ceased, then chloromethyl methyl ether (excess) was added and stirring was continued. After 5 h all volatiles were evaporated i. vac. and the residual material was filtered through silica gel (PE:Et2O, 12:1). The product was obtained as a colourless solid (66%). 1H-NMR (400 MHz, CDCl3, 300 K, δ): 7.73 (s, 1H), 5.41 (s, 2H), 3.90 (s, 3H), 3.32 (s, 3H), 2.73-2.67 (m, 1H), 1.90-1.76 (m, 5H), 1.65-1.58 (m, 2H), 1.47-1.29 (m, 3H).

Provenance & Evidence