US 4,900,476 AGranted

Quinone intermediates for asymmetric synthesis of natural vitamin E

AssigneeHoffmann-La Roche Inc.

InventorsKa-kong Chan, Gabriel G. Saucy

Life of this patent

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Abstract

An asymmetric synthesis for Vitamin E in an optically active pure form for 4-(2,5-diloweralkanoyloxy)-3,4,6-trimethylphenyl-butan-2-one and intermediates therein.

Claims3

Dependent claims

A compound of the formula:

##STR21##

Dependencies are inferred from the claim text.

Facts

Application: 07/303,701Filed 30 Jan 1989 · division
Priority: 18 Dec 1987
Granted: 13 Feb 1990
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

C07D 311/72
With two hydrocarbon radicals attached in position 2 and elements other than carbon and hydrogen in position 6: 3,4-Dihydro derivatives having in…
C07C 46/00
Preparation of quinones
C07C 46/06
By oxidation giving rise to quinoid structures: of at least one hydroxy group on a six-membered aromatic ring
C07C 46/10
Preparation of quinones: separation; Purification; Stabilisation; Use of additives

Family

Serial135,128Parent of this division · filed 18 Dec 1987
US 4,831,185 AParent of this division
US 4,900,476 AThis patent

From the US filing history. Foreign family members aren’t listed.

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