Dieckmann cyclisation of some β,γ-unsaturated dimethyl esters—I

Add time:08/25/2019    Source:sciencedirect.com

Dieckmann cyclisation of some β,γ-unsaturated diesters of the indane series gives as major product of the ring closure the compound derived from the more carbanion formed under standardised reaction conditions. The methyl β-(2-methoxycarbonylmethyl-7-methylinden-3-yl)propionate (2) on Dieckmann ring closure, gives 1-methoxycarbonyl-2-oxo-1,2,3,4-tetrahydro-8-methylfluorene (7) and not the isomeric 3-methoxycarbonyl-2-oxo-1,2,3,4-tetrahydro-8-methylfluorene (6) reported earlier.

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