Add time:09/10/2019 Source:sciencedirect.com
The double addition of bis(trimethylsilyl) ketene acetals [R1, R2 = CH3, –(CH2)5–] to pyridine N-oxide promoted by triflic anhydride under mild conditions generates N-[(trifluoromethane)sulfonyl-1,2-dihydropyridine-2,4-dicarboxylic acids 2a–b. Subsequent reaction of these acids upon iodolactonization conditions affords tetrahydrofuro[3,2-b]pyridine-2(3H)-ones 3a–b containing an exo-insaturation on the products as a result of an unexpected decarboxylation.
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