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Compound 5 was prepared from D-(+)-galactose in 38% overall yield for six steps according to: Bröder, W.; Kuntz, H. Carbohydr. Res. 1993, 249, 221-241.
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4 and evaporated in vacuo. The resulting acid derivative was treated without purification with an etheral solution of diazomethane affording the ester 11b (131 mg, 91%) as 64:36 mixture of diastereomers after purification by column chromatography (silica gel, heptane:AcOEt, 8:2)
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4 and evaporated in vacuo. The resulting acid derivative was treated without purification with an etheral solution of diazomethane affording the ester 11b (131 mg, 91%) as 64:36 mixture of diastereomers after purification by column chromatography (silica gel, heptane:AcOEt, 8:2).
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18
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(b) For a review, see: Helmchen, G.; Hoffmann, R. W.; Mulzer, J.; Schaumann, E. Stereoselective Synthesis; G. Thieme Verlag: Stuttgart, 1996; Vol. 9, pp. 5208-5212.
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