An Efficient Direct Asymmetric
Synthesis of 3-Substituted Phthalides

Zhan-Bin Zhang; Yong-Qin Lu; Xin-Fang Duan

doi:10.1055/s-0030-1260222

PAPER

An Efficient Direct Asymmetric Synthesis of 3-Substituted Phthalides

Zhan-Bin Zhang, Yong-Qin Lu, Xin-Fang Duan*
Department of Chemistry, Beijing Normal University, Beijing 100875, P. R. of China
Fax: +86(10)58802075; e-Mail: xinfangduan@vip.163.com;

Abstract

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Abstract

A facile, two-step, asymmetric synthesis of 3-substituted phthalides has been developed. The enantiopure amide, obtained through coupling of 2-iodobenzoic acid with (S)-1-(pyrrolidin-2-ylmethyl)-1H-imidazole, was magnesiated using isopropylmagnesium chloride. Corresponding reactions with a range of aldehydes were carried out in situ by either direct addition or transmetallation using zinc(II) chloride. Intramolecular esterification of the adduct allowed the versatile asymmetric synthesis of phthalides in up to 88% enantiomeric excess.

Key words

phthalide - magnesiation - chiral auxiliary - diastereoselective addition - asymmetric synthesis

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