L-(+)-Cysteine → HCID 18667310, compound

Participants

Reaction Steps

A mixture of cysteine (Aldrich, 2.0 g, 17.1 mmol) and 3,5-di-tert-butyl-4-hydroxybenzaldehyde (Aldrich, 4.0 g, 17.1 mmol) in methanol (100 mL) was warmed at reflux for 2.25 h. The reaction mixture was cooled to ambient temperature and the solid that formed upon cooling was collected by filtration. The solid was washed with methanol and recrystallized from a mixture of ethanol/ethyl acetate. Recrystallization from ethanol gave 1.3 g (22% yield) of (4R)-2-(3,5-di-tert-butyl-4-hydroxyphenyl)-4-thiazolidine carboxylic acid as an off white solid, m.p. 163°-165° C.

Provenance & Evidence