Design and Implementation of an Efficient Synthetic Approach to Furanosylated Indolocarbazoles: Total Synthesis of (+)- and (−)-K252a
作者:John L. Wood、Brian M. Stoltz、Hans-Jürgen Dietrich、Derek A. Pflum、Dejah T. Petsch
DOI:10.1021/ja9713035
日期:1997.10.1
The first totalsynthesis of the natural product (+)-K252a (2) has been achieved in 12 steps from commercially available materials, with a longest linear sequence of seven steps and an overall yield of 21%. The synthetic strategy employs novel rhodium carbenoid chemistry in the construction of both the indolocarbazole aglycon (4) and the carbohydrate moiety (9).
作者:Kazuhiko Tamaki、Elliott W.D Huntsman、Dejah T Petsch、John L Wood
DOI:10.1016/s0040-4039(01)02166-9
日期:2002.1
This letter describes syntheses of (-)-(7S)-and (+)-(7R)-K252a dimers wherein a convergent bis-indole-N-glycosidic coupling step was used for the resolution of the C(7) substituted (+/-)-aglycon. Dimerization of the derived monomers was achieved via olefin methathesis. (C) 2002 Elsevier Science Ltd. All rights reserved.
Synthesis of the Precursor of K252a and Its Analogs
作者:Xiuwei Sun、Xuan Zhou、Bowen Ke、Hao Song、Xiaolin Wang、Guofeng Yu、Tianshuai Xu、Xianglin Deng
DOI:10.1080/00397911.2010.517370
日期:2011.10.15
A practical and efficient asymmetric synthesis of the key precursor furanose 3 for the synthesis of K252a and CEP-701 has been achieved in nine steps with an overall yield of 12.8% from (R)-methyl beta-hydroxytetradecanoate 5, an industrial intermediate for production of orlistat.