An Efficient and Practical Synthesis of Dibenzo[d,f][1,3]- dioxepines from 2,2'-Dihydroxybiphenyl with Terminal Alkynes Catalyzed by Lewis Acid TiCl4.pdfVIP

An Efficient and Practical Synthesis of Dibenzo[d,f][1,3]- dioxepines from 2,2'-Dihydroxybiphenyl with Terminal Alkynes Catalyzed by Lewis Acid TiCl4.pdf

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An Efficient and Practical Synthesis of Dibenzo[d,f][1,3]- dioxepines from 2,2'-Dihydroxybiphenyl with Terminal Alkynes Catalyzed by Lewis Acid TiCl4.pdf

FULLPAPER AnEfficientandPracticalSynthesisofDibenzo[d,f】1【,3】_ dioxepinesfrOm 2,2。一DihydrOxybiphenylwithTerminal AIkynesCatalyzedbyLewisAcidTiCI4 wu,Haisheng(吴海生) Yang,Jin(杨进) Wang,Lei棚,。(王磊) 。DepartmentofChemistry,HuaibeiNormalUniversity,Huaibei,Anhui235000,China StateKeyLaboratoryofOrganometallicChemistry,ShanghaiInstituteofOrganicChemistry ChineseAcademyofSciences,Shanghai200032,China A synthetics~ategytowardthecyclicadditionof2,2’一dihydroxybiphenyltoterminalalkyneshasbeendevel— opedusingLewisacidTiC14ascatalyst.Thereactionsgenerateddibenzo[d,fl[1,3]dioxepinesderivativesingood yieldswithexcellentregio—selectivityinthepresenceofcatalyticamountofTIC14undermildreactionconditions. Keywords cyclicaddition,2,2’dihydroxybiphenyl,terminalalkynes,region—selectivity,Lewisacid,TIC14 lntroduction Lewis acid as a catalyst ofr the preparation of dibenzo(d,(1,3)dioxepinesderivatives. Seven—memberedoxygen—atom 。containingheterocy‘ Incontinuationofoureffortsindevelopingselective, clesarestructuralcomponentsofmanynaturalproducts effi cient,m ild na d new synthetic strategy to approach and phramaceuticals, such as l,3一benzodioxoles, these seriesofcompounds,herewereport theTIC14 dibenzo[d,f]【1,3】一dioxepines and 12H—dibenzo[d,g】一 catalyzed cyclicaddition reaction of2,2-dihydroxybi— 1『,31.dioxocin derivatives.Infact,ithasalreadydis— phenyltoterminalalkynest

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