Abstract
AbstractA new synthetic approach towards the indole ring system is described. When dimethyl 1‐methyl‐2‐oxa‐1‐aza‐spiro[4.5]dec‐3‐ene‐3,4‐dicarboxylate (6) was refluxed in toluene, the previously known dimethyl 4,5,6,7‐tetra‐hydro‐1‐methyl‐1H‐indole‐2,3‐dicarboxylate (7) was obtained in 71% yield, via a 2,3‐dihydroisoxazole‐pyrrole rearrangement. After treatment with DDQ, the tetrahydro analogue 7 was converted to the corresponding dimethyl 1‐methyl‐1H‐indole‐2,3‐dicarboxylate (8).
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