A process is described for preparing enriched enantiomers of the compound 3-(benzo[1,3]dioxol-5-yl)-2-methylpropanal of formula (I) comprising the following steps: i) reacting the racemic compound 3-(benzo[1,3]dioxol-5-yl)-2-methylpropanol (2) with phthalic anhydride to give the racemic acid (3); ii) resolving the racemic acid (3) with optically active 1-aryl-1-ethanamine (4) in which Ar is an aromatic or heteroaromatic group having from 6 to 12 members optionally substituted with one or more substituents chosen from the group consisting of (C 1 -C 3 ) alkyl, (C 1 -C 3 ) alkoxy and halogen; iii) recovering the (S)-(2) and (R)-(2) alcohols from the resolved acids (3) of step ii) by alkaline hydrolysis; iv) converting the (S)-2 and (R)-2 alcohols into the respective (S) and (R) enantiomers of compound (I).

Process for preparing enriched enantiomers of 3-(Benzo[1,3]dioxol-5-yl)-2-methylpropanal

ROSINI, GOFFREDO;RIGHI, PAOLO
2010

Abstract

A process is described for preparing enriched enantiomers of the compound 3-(benzo[1,3]dioxol-5-yl)-2-methylpropanal of formula (I) comprising the following steps: i) reacting the racemic compound 3-(benzo[1,3]dioxol-5-yl)-2-methylpropanol (2) with phthalic anhydride to give the racemic acid (3); ii) resolving the racemic acid (3) with optically active 1-aryl-1-ethanamine (4) in which Ar is an aromatic or heteroaromatic group having from 6 to 12 members optionally substituted with one or more substituents chosen from the group consisting of (C 1 -C 3 ) alkyl, (C 1 -C 3 ) alkoxy and halogen; iii) recovering the (S)-(2) and (R)-(2) alcohols from the resolved acids (3) of step ii) by alkaline hydrolysis; iv) converting the (S)-2 and (R)-2 alcohols into the respective (S) and (R) enantiomers of compound (I).
EP2258696
BORZATTA V.; ROSINI G.; RIGHI P.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11585/95849
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