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  • 《中国医药工业杂志》2005年第9期摘录:·528·乙醚(10ml×3)

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·528·乙醚(10ml×3)萃取。水相补加丙酮及少量OsO。即可继续投入底物催化反应,重复使用情况见表2。合并萃取相,用无水硫酸镁干燥,过滤,滤液减压蒸除乙醚,剩余物经柱色谱分离得1,结构表征数据同上,收率及ee见表1。中国医药工业杂志ChineseJournalofPharmaceuticals2005,36(9)表1配体2和3催化制备1的效果表2不同体系中配体的回收使用情况参考文献:[1]CommerconA,BezardD,BernardF'eta1.Improvedprotec—tionandesterificationofaprecursorofthetaxotereandtaxolsidechains[J].TetrahedronLett.1992.33(36):5185—5188.[2]SongCE,OhCR,RohEJ,etal.One—stepsynthesisofpaclitaxelside·-chainprecursor:benzamide·-basedasymmetricaminohydroxylationofisopropyltrans—cinnamate[J].Tetrahedron:Asymmetry,1999,10(4):671—674.[3]WangZM,KolbHC,SharplessKB.Large—scaleandhighlyenantioselectivesynthesisofthetaxolC一13sidechainthroughasymmetricdihydroxylation[J].JOrgChem,1994,59(17):5104—5105.[4]SongCE,LeeSW,RohEJ,eta1.Anewsyntheticrouteto(3R,4S)一3-hydroxy一4一phenylazetidin一2一oneasataxolsidechainprecursor[J].Tetrahedron:Asymmetry,1998,9(6):983—992.[5]KuangYQ,ZhangSY,JiangR,etal.AfreeligandfortheasymmetricdihydrOxylationofolefinsutilizingone—phasecatalysisandtwo—phaseseparation[J].Tetrahedronk航2002,[6][7][8][9][10]43(20):3669—3671.SongCE,JungDU,RohEJ,eta1.Osmiumtetroxide一(QN)2PHALinanionicliquid:ahighlyefficientandrecyclablecatalystsystemforasymmetricdihydroxylatiOnofolefins[J].ChemCommun,2002,(24):3038—3039.李月明,范青华,陈新滋.不对称有机反应——催化剂的回收和利用m].北京:化学工业出版社,2003.孙晓莉,匡永清,南鹏娟,等.1,4.双(9一D一奎宁)一2,3.二氮杂萘的合成及其在烯烃不对称二羟基化反应中的应用[J].高等学校化学学报,2003,24(7):1910—1912.程司垫,张生勇,骆丽华,等.1,4一双(9一D.奎宁)。2,3一二氮杂萘一0s0。催化烯烃的不对称氨羟化反应[J].高等学校化学学报,2004,25(4):758.761.LohrayBB,NandananE,BhushanV.Catalyticasymmetricdihydroxylationofalkenesusingsilicagelsupportedcinchonaalkaloid[J].Tetrahedron:Asymmetry,1996,7(10):2805—2808PreparationofEthyl(2R,3S)一2,3一Dihydroxy一3一phenylpropionatebyAsymmetricDihydroxylationCHENHui’,LUOJing。,ZHAOAn—Dong。,SUNXiao—Li。。臼.Dept.ofChemistry,FourthMilitaryMedicalUniversity,Xi'an710033;2.ShaanxiInstituteofDrugControl,Xi'an710061)ABSTRACT:TworecyclableligandswerepreparedandappliedtoSharplessasymmetricdihydroxylationreactionintwosolventsystemsforpreparationofethyl(2R,3S)一2,3·dihydroxy一3一phenylpropionate,theC13sidechainofpaclitaxel,fromethylcinnamate.Aproductofeeover95%and85%一95%yieldwasobtainedevenaftertheligandswerereusedfortl~eetimes.KeyWords:(2R,3S)一2,3一dihydroxy一3一phenylpropionate;Sharplessasymmetricdihydroxylationreaction;chiralligand;asymmetriccatalysis;paclitaxel;intermediate;synthesis

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