期刊
ORGANIC PROCESS RESEARCH & DEVELOPMENT
卷 19, 期 9, 页码 1203-1213出版社
AMER CHEMICAL SOC
DOI: 10.1021/op500351q
关键词
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A scalable, asymmetric synthesis of (3aS,6aS)-6a-(5-bromo-2-fluorophenyl)-1-((R)-1-phenylpropyl)tetrahydro-1H,3H-furo[3,4-c]isoxazole, a key intermediate in the synthesis of LY2886721, is reported Highlights of the synthesis include the development of an asymmetric [3 + 2] intramolecular cycloaddition facilitated by trifluoroethanol, and the development of a new synthesis of (R)-N-(1-phenylpropyl)hydroxylamine tosylate which proceeds through a p-anisaldehyde imine and avoids the formation of toxic hydrogen cyanide gas as a byproduct. The synthesis proceeds over four steps and provides the product in 36% overall yield.
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