Synthesis of L-scyllo-inositol 1,2,4-trisphosphate, scyllo-inositol 1,2,4,5-tetrakisphosphate and phosphorothioate and DL-2-deoxy-2-fluoro-myo-inositol 1,4,5-trisphosphate: optical resolution of DL-1-O-allyl-3,6-di-O-benzyl-4,5-O-isopropylidene-scyllo-inositol
作者:Dethard Lampe、Changsheng Liu、Mary F. Mahon、Barry V. L. Potter
DOI:10.1039/p19960001717
日期:——
Routes for the synthesis of scyllo-inositol tris-and tetrakis-phosphates and 2-deoxy-2-fluoro-myo-inositol 1,4,5-trisphosphate from myo-inositol have been devised. For DL-scyllo-inositol 1,2,4-trisphosphate, DL-1-O-allyl 1–3,6-di-O-benzyl-4,5-O-isopropylidene-scyllo-inositol was prepared from the triflate of DL-1-O-allyl-3,6-di-O-benzyl-4–5-O-isopropylidene-myo-inositol by inversion at C-2. Removal of the isopropylidene group and phosphorylation gave the protected trisphosphate. Deblocking with sodium in liquid ammonia afforded racemic scyllo-inositol 1,2,4-trisphosphate. DL-1-O-Allyl-3,6-di-O-benzyl-4,5-O-isopropylidene-scyllo-inositol was resolved into its enantiomers by means of the crystalline 2-O-camphanate ester. The structure of one diastereoisomer, 1D-O-allyl-3,6-di-O-benzyl-2-O-[(–)-camphanate]-4,5–0-isopropylidene-scyllo-inositol was determined by single-crystal X-ray crystallography. 1D-(+)-1-O-Allyl-3,6-di-O-benzyl-4,5-O-isopropylidene-scyllo-inositol was used to prepare 1L(–)-scyllo-inositol 1,2,4-trisphosphate in a fashion analogous to the racemic modification. DL-1-O-Allyl-3,6-di-O-benzyl-scyllo-inositol was isomerised to the (Z)-prop-1-enyl derivative. The propenyl group was then removed to give the meso-1,4-di-O-benzyscyllo-inositol. Phosphitylation followed by oxidation or sulfoxidation gave the fully protected tetrakis-phosphate or -phosphorothioate, respectively. After deblocking and purification, scyllo-inositol 1,2,4,5-tetrakisphosphate and scyllo inositol 1,2,4,5-tetrakisphosphorothioate were obtained.
DL-1-O-Allyl-3,6-di-O-benzyl-4,5-O-isopropylidene-scyllo-inositol was isomerised to the 1-O-[(Z)-prop-1-enyl] derivative which was converted into the 2-O-triflate. Displacement of the triflate using tetrabutylammonium fluoride proceeded with inversion of configuration to give DL-3,6-di-O-beflzyl-2-deoxy-2-fluoro-4,5-O-isopropylidene-1-O-([(Z)-prop-1-eny]-myo-inositol. Removal of propenyl and isopropylidene groups afforded DL-3,6-di-O-benzyl-2-deoxy-2-fluoro-myo-inositol, which was phosphitylated and the product oxidised to give the fully protected 2-fluoro trisphosphate. Deprotection furnished DL-2-deoxy-2-fluoro-myo-inositol 1,4,5-trisphosphate. These compounds will be useful probes for investigation of the polyphosphoinositide pathway of cellular signalling.
已经设计了从myo-肌醇合成scyllo-肌醇三磷酸和四磷酸以及2-脱氧-2-氟代-myo-肌醇1,4,5-三磷酸的路线。对于DL-scyllo-肌醇1,2,4-三磷酸,通过在C-2位进行反转,从DL-1-O-烯丙基-3,6-二-O-苄基-4,5-O-异丙叉-myo-肌醇的 triflate 合成 DL-1-O-烯丙基-1-3,6-二-O-苄基-4,5-O-异丙叉-scyllo-肌醇。去除异丙叉基团并磷酸化得到保护的三磷酸。在液氨中用钠去保护得到消旋的scyllo-肌醇1,2,4-三磷酸。DL-1-O-烯丙基-3,6-二-O-苄基-4,5-O-异丙叉-scyllo-肌醇通过晶体2-O-樟脑酸酯被解析为其对映体。通过单晶X射线晶体学确定了其中一个非对映异构体,1D-O-烯丙基-3,6-二-O-苄基-2-O-[(-)-樟脑酸]-4,5-O-异丙叉-scyllo-肌醇的结构。1D-(+)-1-O-烯丙基-3,6-二-O-苄基-4,5-O-异丙叉-scyllo-肌醇用于类似消旋改性的方式制备1L(-)-scyllo-肌醇1,2,4-三磷酸。DL-1-O-烯丙基-3,6-二-O-苄基-scyllo-肌醇被异构化为(Z)-丙-1-烯基衍生物。然后去除丙烯基团得到meso-1,4-二-O-苄基scyllo-肌醇。接着磷酸化和氧化或硫氧化分别得到全保护的四磷酸或硫代磷酸。去保护和纯化后,得到scyllo-肌醇1,2,4,5-四磷酸和scyllo-肌醇1,2,4,5-四硫代磷酸。DL-1-O-烯丙基-3,6-二-O-苄基-4,5-O-异丙叉-scyllo-肌醇被异构化为1-O-[(Z)-丙-1-烯基]衍生物,然后转化为2-O-triflate。使用四丁基氟化铵取代triflate进行构型反转,得到DL-3,6-二-O-苄基-2-脱氧-2-氟代-4,5-O-异丙叉-1-O-([(Z)-丙-1-烯基]-myo-肌醇。去除丙烯基和异丙叉基团得到DL-3,6-二-O-苄基-2-脱氧-2-氟代-myo-肌醇,对其进行磷酸化并氧化得到全保护的2-氟代三磷酸。去保护得到DL-2-脱氧-2-氟代-myo-肌醇1,4,5-三磷酸。这些化合物将是有用的探针,用于研究细胞信号传导的多磷酸肌醇途径。