Synthesis of Tropane Alkaloids via Enantioselective Deprotonation of Tropinone
摘要:
Enantioselective deprotonation of tropinone 2 with chiral lithium amides 5a and 6a, in the presence of LiCl, gave tropinone lithium enolate in up to 95% ee. The C-2 symmetrical lithium amide 6a worked best when it was generated in situ from the hydrochloride salt of the corresponding amine 6b. The deprotonation was used as the key step in synthesis of tropane alkaloids: ent-anhydroecgonine, ent-knightinol, KD-B, chalcostrobamine, ent-isobellendine, and ent-darlingine. The absolute configuration of natural benzyltropane and pyranotropane alkaloids was established (by correlation with anhydroecgonine) to be 'cocaine-like' i.e., the side chain originates at C-2 of the tropane ring system in all cases.
Synthesis of pyranotropanes via enantioselective deprotonation strategy
作者:Marek Majewski、Ryszard Lazny
DOI:10.1016/s0040-4039(00)73063-2
日期:1994.5
Synthesis of tropane alkaloids darlingine, chalcostrobamine and isobellendine both in the racemic form and as unnatural enantiomers is described. Enantioselective deprotonation of tropinone, which proceeded with ca 90% ee, was the key step in each of the syntheses. Enantioselectivity was increased in the presence of LiCl.
Lazny, Ryszard; Nodzewska, Aneta; Sienkiewicz, Michal, Polish Journal of Chemistry, 2006, vol. 80, # 4, p. 659 - 662
作者:Lazny, Ryszard、Nodzewska, Aneta、Sienkiewicz, Michal
DOI:——
日期:——
HOFFMANN, H. M. R.;HAASE, K.;ISMAIL, Z. M.;PREFTITSI, S.;WEBER, A., CHEM. BER., 1982, 115, N 12, 3880-3885
作者:HOFFMANN, H. M. R.、HAASE, K.、ISMAIL, Z. M.、PREFTITSI, S.、WEBER, A.