Process Development of Halaven®: Synthesis of the C14-C35 Fragment via Iterative Nozaki-Hiyama-Kishi Reaction-Williamson Ether Cyclization
摘要:
Multikilogram manufacturing process of the Halaven (R) C14-C35 fragment is described. The synthesis features convergent assembly of subunits by iterative asymmetric Ni/Cr-mediated coupling executed in fixed equipment.
[EN] INTERMEDIATES FOR THE PREPARATION OF HALICHONDRIN B<br/>[FR] INTERMEDIAIRES POUR LA PREPARATION D'HALICHONDRINE B
申请人:EISAI CO LTD
公开号:WO2005118565A1
公开(公告)日:2005-12-15
The present invention provides macrocyclic compounds, synthesis of the same and intermediates thereto. Such compounds, and compositions thereof, are useful for treating or preventing proliferative disorders Formula (F-4).
1,3-Asymmetric induction in the intramolecular [2+2] cycloaddition of alkene-keteniminium salts. Synthesis of (+)-gibberellic acid key intermediate
作者:Pil-Jong Shim、Hee-Doo Kim
DOI:10.1016/s0040-4039(98)02228-x
日期:1998.12
Optically active bicyclo[4.2.0]octan-7-ones were synthesized by stereoselective intramolecular [2+2] cycloaddition of alkene-keteniminium salt derived from L-glutamic acid, based on 1,3-asymmetric induction. Synthetic application toward (+)-gibberellic acid key intermediate was also described.
INTERMEDIATES FOR THE PREPARATION OF ANALOGS OF HALICHONDRIN B
申请人:Eisai R&D Management Co., Ltd.
公开号:US20140163242A1
公开(公告)日:2014-06-12
Intermediates and methods of their use in the synthesis of analogs of halichondrin B are provided.
提供了中间体及其在合成半乳霉素B类似物中的使用方法。
Intermediates for the Preparation of Halichondrin B
申请人:Austad Brian
公开号:US20070244187A1
公开(公告)日:2007-10-18
The present invention provides macrocyclic compounds, synthesis of the same and intermediates thereto. Such compounds, and compositions thereof, are useful for treating or preventing proliferative disorders Formula (F-4).
A Direct Method for the Conversion of Terminal Epoxides into γ-Butanolides
作者:Mohammad Movassaghi、Eric N. Jacobsen
DOI:10.1021/ja025604c
日期:2002.3.1
A new and efficient process for the conversion of terminal epoxides to gamma-butanolides is described involving Lewis acid promoted epoxide ring-opening by 1-morpholino-2-trimethylsilyl acetylene. Addition of a terminal epoxide to a solution of the ynamine and boron trifluoride diethyl etherate in dichloromethane at 0 degrees C rapidly affords a cyclic keteneaminal that can be hydrolyzed and protodesilylated under mild conditions to provide the corresponding gamma-butanolide in high yield. The net transformation is equivalent to an acetate enolate opening of terminal epoxides. The formation of a cyclic keteneaminal as the direct addition product was observed by monitoring of the reaction by IR and NMR spectroscopy. Functionalized gamma-lactones were prepared by the interception of the reactive cyclic keteneaminal prior to hydrolysis. Reactions with enantiomerically enriched terminal epoxides provide the corresponding gamma-butanolides without loss of optical activity. The compatibility of the present methodology with a wide range of functional groups is noteworthy.