A simple synthesis of 7‑substituted 1‑acetyl‑2,3‑dihydroindoles
著者 Somei Masanori, Kawasaki Toshiya, Ohta Toshiharu
journal or
publication title
Heterocycles
volume 27
number 10
page range 2363‑2365
year 1988‑01‑01
URL http://hdl.handle.net/2297/4312
HETEROCYCLES,Vol、27,No.10'1988
ASエMPエJESYNIDHES工SOF7-SUBST工TUTED1-nCETYL-2,3-,エHYDROエNDOエES’
MasanoriSomei,*ToshiyaKawasaki,andmoshiharuOhta FacultyoEPharmaceuticalSciences,KanazawaUniversity
l3-エTakara-machi,Kanazawa920,.apa、
Abstract-7-Cyano-,7-hYdroxy-,7-methoxycarbonyl-,7-meth-
y1-,7-nitro-,and7-phenyl-ユーacetyr2P3-dihydroindolesarepre-
paredintwosteps(oronepot)Eroml-acety1-2,3-dihydroindole.
A1though7-substituted1-acetyl-2,3-dihydroindo1esaresuitablebui1dingb1ocksEor
thesynthesisorbioェogica11yinterestingindolealka1oids2havingasubstituentat
the7-position,theyareavai1ableonlythroughaユaboriousmultisteproute・Wenow wishtodescribeasimp1esynthesismethodforthemutiUzing(l-acetyl-2,3-dihydro-
indo1-7-y1)thal1iumbis(trif1uoroacetate)(2),readi1yavailab1eどroml-acetyl-2,3-二四夕
dihydroindole(1)asreportedprev1ously、3 aや
WeEirstapp1iedourstannation-thal1ation(tin-thal1)reaction4Eorobtaining7-
a1kY1and7-arylsubstitutedcompounds・Treatmentof2withtetramethyltininthe~
Presenceoどacatalyticamountofpaエエadiumacetate(P。(OZAc)2)inN,N-dimethylform-
amide(DMF)atl20oCだ。r4haEforded1-acetyl-2,3-dihydro-7-methylindole5(3,mPPL戸
89-90.C)andlin328and45gyie1ds,respectively・Similar1y,l-acety1-2,3-dihydro-八ケ
7-Phenylindole(4,mpエ25.5-126.C)waspreparedisn358yieldtogetherwith638yield~
◎だ1bythereactiono五ZvvithtetraphenyltinQ~ へP
エntroductiono五methoxycarbonylgroupintotheフーpositjpnundertheusualreaction
conditions6a’b wasnotsatisEactory・Thus,thereactiono丑zwithcarbonmonoxide~
inthePresenceo全acata1yticamountofPd(OZkc)2inmethano1at80oC五or3h,造ol-
1。wedbythetreatmentwithetherealdiazomethane,a正ordedmethyll-acety1-2,3-di- hydroindo1e-7-carboxy1ate(5,mp1O3-ユO4pC)andユin278and44患yields,respective-~ ~
ェy・エnteresting1y,additionofchromiumhexacarbonyltotheabovereactionmedium wasnewエyEoundtoimprovetheyie1dofthedesiredproduct(5)remarkably・Using グー
onemo1areCIuivalentoどchromiumhexacarbonyl,5wasobtainedin52号yieユdtogether~
withmethyl2,3-dihYdroindole-7-carboxylate(6,mp69-69.5°C)andlinU8and23g ~ ~
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yieエ。s,respectively、
1-Acetyl-2,3-dihydroindole-7-carbonitr上1e(7,mp133.5-134°C,1it、7mpl24oC)couldヘグ゛
beproducedin698yjAeldbythereactionof2withfivemolarequivalentsofcu- 公〆
prouscyanide6b’cinDldFat120oCfor6h・Ontheotherhand,ourpheno1synthesis method8だromthaUiumcompoundwassuccessfu11yappliedto2anditsreactionwith
ヘアcupricsuエモatepentahydrateinDDdF-H20(181,v/v)at125.CEor6haffordedl-acet- y1-2,3-dihydro-7-hydroxyindo1e(8,mp114.5-ユ15。Cノユit、9mp112-114°C)in62gyield.'U
OnepotsynthesisoE8Eromlcouユdbereadi1ycarriedoutin42g。verallyieldbyjV 〃v theinitialtha11ationwiththalliumtris(trinuoroacetate),followedbythereac-
ti。nwithcupricsu正atepentahydrate・
ConversionoEcarbon-thal1iumbondtocarbon-nitrogenbondisreportedbythereac-
ti。nwithsodiumnitrite・lOHowever,theattemptednitrationof2accordingtothe~
reportedmethod1Ogave1-acety1-2,3-dihydro-7-nitroindo1e(9,mpl63-164oC)inpoor
ヘアyield(3-268)undervariousreactionconditionsinadditiontovariab1eyie1ds(0-
268)of1-acetyl-2,3-dihydro-5,7-dinitroindole(10,mp217-2ユ8°C,1it・Uヘジ mp2エ0-212
。c).ZklthoughTaylorl21O andUemurareportedthatthereactionofthalliumcompounds withnitroniumioncouldnotchangethecarbon-thalliumbondtoacarbon-nitrogen bond,weexpectedthattheadditionofcupric(orcuprous)ionwouldalterthereac-
tiontothedesireddirection・Basedonthisidea,wejEina11yどoundanewmethod whichproducedthedesiredmononitrocompound(9)selective1y・Thus,treatmentoE2~ へシ withtwomolarequivaエentsofcupricnitratetrihydrateinDMF-aceticanhydride(1:
1,v/v)at80oCfor5haE五orded468yieldoモ9withoutanydetectableamountoflO.~ ~
Generaエizationofthisreactionisnowinprogress・
エnconclusion,various7-substituted2,3-dihydroindolesareeasilyavaiユableutiliz-
ing2asacolmnonsyntheticintermediate,thoughoptimumreactionconditionsarenot へP
made・Sincetheiso1ationof2isnotnecessaryandonepotoperationispossible,3. J、P
thepresentmethodshouldfindconsiderab1eapp1icationinorganicsynthesis.
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HETEROCYCLES,Vol、27,No.70,7988
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Received,12ndjuly,1988
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