期刊
ORGANIC PROCESS RESEARCH & DEVELOPMENT
卷 14, 期 5, 页码 1239-1247出版社
AMER CHEMICAL SOC
DOI: 10.1021/op100164v
关键词
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An efficient scalable route to synthesize the enantiomerically pure tert-butyl-(1R,4S,6R)-4-(hydrox)methyl)-3-azabicyclo[4.1.0]heptane-3-carboxylate is described. Compared to the original routes, significant improvements were made by using an innovative approach starting from commercially available chiral lactone. In this approach, one of the key steps described is an elegant epimerization/hydrolysis of the undesired diastereoisomer avoiding tedious purification. The chemistry has been scaled up to produce kilogram amounts of tert-butyl-(1R,4S,6R)-4-(hydroxymethyl)-3azabicyclo[4.1.0]heptane-3-carboxylate in 43% yield over nine chemical transformations.
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