A stereoselective synthesis of (E)-1-halo-6,6-dimethyl-2-hepten-4-yne: a key intermediate for terbinafine
作者:Shan-Yen Chou、Chin-Lu Tseng、Shyh-Fong Chen
DOI:10.1016/s0040-4039(00)00511-6
日期:2000.5
A study of the stereoselective halogenation of 6,6-dimethyl-1-hepten-4-yn-3-ol (1) using a series of halogenating agents is described. Of the many agents investigated, boron trichloride is the most successful reagent for stereoselective halogenation (E:Z=9:1max). The resulting (E)-1-halo-6,6-dimethyl-2-hepten-4-yne (2), a keyintermediate for terbinafine, an antifungal agent, is obtained in good yield
Enyne Chlorides: Substrates for Copper-Catalyzed Asymmetric Allylic Alkylation
作者:Hailing Li、Alexandre Alexakis
DOI:10.1002/anie.201107129
日期:2012.1.23
A select few: Several prochiral enynechlorides were employed as substrates in the title reaction using Grignard reagents as the alkylation reagents (see scheme; CuTC=copper(I) thiophenecarboxylate). Excellent 1,3 substitution regioselectivities and good to excellent enantioselectivities were obtained. The substrate scope is additionally extended to diene chlorides.