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Synthesis of Carboxylic Acids, Esters, Alcohols and Ethers Containing a Tetrahydropyran Ring Derived From 6-methyl-5-hepten-2-one

Synthesis of Carboxylic Acids, Esters, Alcohols and Ethers Containing a Tetrahydropyran Ring Derived From 6-methyl-5-hepten-2-one

Yohko Hanzawa, Kahoko Hashimoto, Yoshio Kasashima, Yoshiko Takahashi, Takashi Mino, Masami Sakamoto, Tsutomu Fujita

J Oleo Sci. 2012;61(11):631-40.

PMID: 23138252

Abstract:

3-hydroxy acids, 3-hydroxy-3,7-dimethyloct-6-enoic acid (1) and 3-hydroxy-2,2,3,7-tetramethyloct-6-enoic acid (2), were prepared from 6-methyl-5-hepten-2-one, and they were subsequently used to prepare (2,6,6-trimethyltetrahydropyran-2-yl)acetic acid (3) and 2-methyl-2-(2,6,6-trimethyltetrahydropyran-2-yl)propanoic acid (4), respectively, via cyclization with an acidic catalyst such as boron trifluoride diethyl etherate or iodine. The reaction of carboxylic acids 3 and 4 with alcohols, including methanol, ethanol, and 1-propanol, produced the corresponding methyl, ethyl, and propyl esters, which all contained a tetrahydropyran ring. Reduction of carboxylic acids 3 and 4 afforded the corresponding alcohols. Subsequent reactions of these alcohols with several acyl chlorides produced novel esters. The alcohols also reacted with methyl iodide and sodium hydride to provide novel ethers. A one-pot cyclization-esterification of 1 to produce esters containing a tetrahydropyran ring, using iodine as a catalyst, was also investigated.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP110930	6-Methyl-5-hepten-2-one		110-93-0	Price

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