Synthetic studies directed towards epothilone A: Enantioselective synthesis of a C7 C15 carboxaldehyde segment
作者:Panicker Bijoy、Mitchell A. Avery
DOI:10.1016/s0040-4039(97)10527-5
日期:1998.1
Enantioselective syntheses of a protected C7C15 fragment of epothilone A is reported in ten manipulations in good overall yield. An alkynyl-aluminum induced opening of a chiral epoxide followed by reordering of functionality furnished the iodide 18. Chain elongation with N-propionyl-1S-(−)-2, 10-camphorsultam 19 afforded the elaborated acylsultam 20 which was reduced and reoxidized to furnish a protected
受保护的C的不对称合成7 C 15埃博霉素A的片段报道,良好总产率10操作。炔基铝诱导的手性环氧化物的打开,然后官能团的重排提供了碘化物18。用N-丙酰基-1链伸长小号- ( - ) - 2,10-樟脑磺19提供的精细的acylsultam 20将其还原和被再氧化,得到受保护的手性醛6适合于羟醛缩合,代表Ç 7 C 15部埃博霉素A.