Acetic Acid → 7-Formyl-3,11,15,19-tetramethyl-2,6,10,14,18-eicosapentaen-1-ol tetrahydropyranyl ether

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Reaction Steps

Following the procedure stated in Example 2-(1), 5.8 g of (E)-4-methyl-6-(2'-tetrahydropyranyloxy)-4-hexen-1-yltriphenylphosphonium iodide was treated with n-butyllithium in 30 ml of anhydrous tetrahydrofuran. Then, the resultant was treated with 3.2 g of 1,1-dimethoxy-6,10,14-trimethyl-5,9,13-pentadecatrien-2-one prepared by the process stated in Referential example 7. The resulting oil was treated with 40 ml of 50% acetic acid to yield 4.2 g of 7-formyl-3,11,15,19-tetramethyl-2,6,10,14,18-eicosapentaen-1-ol tetrahydropyranyl ether. The product was reduced with 150 mg of sodium borohydride and treated with p-toluenesulfonic acid in methanol in the same manner as stated earlier, and purified by the silica gel column chromatography to yield 1.6 g of the desired product. This was a mixture of the (E,E,E,E), (E,Z,Z,E), (E,Z,E,E) and (E,E,Z,E) isomers.

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