Chromanyl esters useful for the preparation of tocophenol

Details Chromanyl esters useful for the preparation of tocophenol Chromanyl esters useful for the preparation of tocophenol

C - Chemistry, Metallurgy

07

D

260/357.1

C07D 311/58 (2006.01)

Patent

CA 1334852

Disclosed are new chromanyl ester of (a) the formula (IV) Image (IV) (b) the formula (IV') Image (IV') and (c) the formula (I''') Image (I''') either as a mixture of two diastereomers or as a pure diastereomer thereof, wherein the group Image is optically active residue, R1, R2, R3 and R4 are, independently, each hydrogen or C1-C4-alkyl, R' is C1-C4- alkyl, R5 is C1-C4 alkyl and Ar is phenyl or naphthyl unsubstituted or substituted by more than two substituents selected amongst C1-C4-alkyl, C1-C4-alkoxy, chlorine, bromine, cyano and nitro. These compounds are intermediates for use in preparing tocopherol.

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