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Synthetic Communications
An International Journal for Rapid Communication of Synthetic Organic Chemistry
Volume 7, 1977 - Issue 3
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Original Articles

The Synthesis of Hydronaphthalenes from m-Toluic Acid via Cyclization of Thioacetal Monosulfoxides

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Pages 233-237 | Received 02 Mar 1977, Published online: 23 Oct 2006
 

Abstract

We recently developed a convenient route to hexahydronaphthalenols such as 5 (R=CO2CH3 or CH3) starting from m-toluic acid (1)1. The key features of the route involved reduction-alkylation of the toluic acid to the dihydro derivative 2 2, subsequent deprotection and oxidation of the side chain primary alcohol, and acid-catalyzed cyclization of the resulting aldehyde 4. In the case of the dimethylnaphthalenols 5 (R=CH3), conversion of the angular carboxylic function to the methyl group was effected prior to cyclization via reduction of the p-toluenesulfonic ester of the neopentyl alcohol 3 (R=CH2OH) using lithium triethylborohydride3.

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