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Synthesis 2011(21): 3435-3438
DOI: 10.1055/s-0030-1260222
DOI: 10.1055/s-0030-1260222
PAPER
© Georg Thieme Verlag
Stuttgart ˙ New YorkAn Efficient Direct Asymmetric Synthesis of 3-Substituted Phthalides
Further Information
Received
22 July 2011
Publication Date:
13 September 2011 (online)
Publication History
Publication Date:
13 September 2011 (online)

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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