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Prepared according to the procedure described by Hubschwerlen, C. and Schmid, G. Helv. Chim. Acta 1983, 66, 2206-2209 with the addition of MgSO4. To a suspension of (S)-2,2-dimethyl-1,3-dioxolane-4-carbaldehyde (Carbosynth LLC, 346 g, 43% in DCM, 1.143 mol) and MgSO4 (278 g) in DCM (1.5 L) at 0° C. was added 2,4-dimethoxybenzylamine (193 g, 1.154 mol) over 20 min. After stirring at rt for 2 h it was filtered, washing the filter cake with DCM (2×250 mL). The mother liquor was used directly in step 2.

1. customPrepared
2. filtrationwas filtered
3. washwashing the filter cake with DCM (2×250 mL)