DOI: 10.1055/s-00000084



Three diastereomers of : -, (2,5)- and (2,5)- are formed during the synthesis, each being suitable for alkylation. We chose the crystalline (2,5)-isomer , which was easily separated from the reaction mixture as it crystallizes upon standing in a fridge; the product was filtered off and was washed with hexane. For the original procedure, see: Yamamoto Y, Hoshino J, Fujimoto Y, Ohmoto J, Sawada S,
Synthesis. 1993; 298 

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