A convenient synthetic approach to 4‑substituted indoles
著者 Somei Masanori, Yamada Fumio journal or
publication title
Heterocycles
volume 26
number 5
page range 1173‑1176
year 1987‑01‑01
URL http://hdl.handle.net/2297/4310
HETEROCYCLES,V01.26,N。、5,7987
ACONVEN工ENTSYNTHETエCAPPROACHTO4-SUBSTエTUTED工NDOLES1
FumioYamadaandMasanoriSomei*
Facu1tyoどPharmaceuticalSciences,KanazawaUniversitY l3-エTakara-machi,Kanazawa920,.apa、
AbstractAsimp1eandpractユcalsYntheticmethod玉or 4-halogenoindoles,4-indolecarbaldehyde,4-cyanoindoエe,and 4-methoxycarbony1indoleiselaborated.
4-Halogenoindoles'24-indolecarbaldehyde,34-cyanoindo1e,2b’4and4-alkoxycarbonyl-
1ndoles3c’5
areuse造ulbuildingblocksfortheconstructionoEnaturaェalkaloids having4-substitutedindolenucェeus・However,theyarestillnotreadilyavailable,thoughmuche正ortshavebeenpaidontheirsyntheses、ェnthiscoInmunication,we Wishtodescribeasimp1eandpracticalsynthet1cmethod造orthesebuildingb1ocks・
WehavealreadyestablishedanexperimentalprocedureforthesynthesisoE(3-Eor- mY1indo1-4-yl)thalliumbis-trimuoroacetate(2)startingErom3-indolecarbaldehyde ヘア
(エ)inlOO-200gscale、6Now,Wehaveだ。undthatthetha11iumcollpound(2)canbe
~ グミグusedasacomIlonintermediateforthesynthesesofabovementionedbuildingb1ocks・
Thus,carbonylationof2inmethanol7inthepresenceofacatalyticamountof
ベタpal1adiumacetateaEfordedmethy13-rormy1-4-indolecarboxylate(3)in54gyield・ グ、夕
CYanationoE2withcuprouscyanide8inrefluxingN,N-dimethY1Eormamideproduced
~4-cYano-3-indo1ecarba1dehyde(4)in53gyield、Preparationof4-halogeno-3-indole-~ carba1dehydes(5a-c)wascarriedoutbythereactionoE2withappropriatehalo- ~~ ~
genatingreagentsaccordingtoourreportedprocedure・za
Since4-substitutedindoleshavingnosubstituentatthe3-positionaresometimes needed,wenexttriedtogetthemutilizingabovementionedreadi1yaccessib1ecom-
Pounds,3,4,and5a-c・Directdecarbonylationof5abYtreatmentwitheitheracids へP八一へ〆~へ’
orbaseswereunsuccessEuェ.Therefore,variousoxidativereagentswereexaminedon 5aasarePresentativesubstratewithanaimtoobtainthecorresponding4-iodo-3- へ〆
indo1ecarboxylicacid(8a)buta1lattempts9
~ endedinfai1ure・Fina11y,oxidation withsodiumch1oriteinthepresenceof2-methyl-2-butenewasEoundtoworkwell lO-1173-
Tl(OCOCF 旨3)2
00Me COOMe
O■j--
HCpl
CHOl1
OOMe
○
H  ̄つ
HTl(OCOCF3)2
HO
○
H  ̄0コ一○コ-0
2 グレ 8 11 ~
I
a・pC ●●●●●● xxx Br C1 エCOOMe
HO OOH
○
H  ̄ --○
H  ̄0コ
H 3
|⑫
ヘジ 6 ~ 9 ~
CN CHO
HO OOH
○
 ̄○
H -- H --4 ~ 7 10 ~ H 13 ~
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HETEROCYCLES,Vol、26,No.5,7987
and5awasconvertedto8ain73号yield・Undersimnarreactionconditions,methylへPデー
3-formy1-4-indolecarboxylate(3),4-cyano-(4),4-bromo-(5b),and4-chloro-3-in- ハン グミヴ グ、〃
do1ecarbaldehyde(5c)weresuccessEu11ytransfo]medtothecorrespondingcarbox- ’LP
ylicacids,6,7,8b,and8c,in778,90号,868,and938yields,respectively.~ヘジ~ グベヴ
TreatmentoE8avvithetherealdiazomethaneafどordedmethY14-iodo-3-indolecarbox-へ>
ylate(14a)inQIuantitativeyield,althoughdirectconversionof5atol4ausing 〃もハグ ヘー グLグ、〆
manganesedioxideandsodiumcyanideinmethanol11proceededinonエy24gYie1d・
Basedupontheseresults,whenthesodiumchloriteoxidationreactionwascarried outandEo11owedbytreatmentwithetherealdiazomethane,onepotsYnthesesoEmeth-
yl4-halogeno-3-indolecarboxylates(14a,b,l2c12)wasrealizedin78g,818,and93亀
へソ帛二~~yields,respectively・mhesecompoundsvvereidenticalwiththeauthenticsamp1es preparedErommethyl3-indo1ecarboxy1ate(16)、a(3-methoxycarbonylindol-4-yl)一六〆~
thalliuInbis-trユfluoroacetate(15)andwereeasilY1edtothecorresponding4- へシ halo9enoindoles(l1a-c)inhighYieldsaccordingtothereportedalkalinehydro1Y- ヘハゲヘア
sisreaction. 2a
Decarboxyエationof4-substituted-3-indolecarboxylicacidswerereadilyattained simp1ybyheatingtheminpyridine・Underthereactioncondition,6,7,and8a
ゲ、〆~ ’1-
a丘ordedtheexpected4-substitutedindoles,9plO,andlla,in992i,908,and89g~鈩巴ブ グLグ、〆
yields,respectively・Subsequent】ごeduction13
of4-cyanoindoleUO)withdiisobu- 〃L〆 tylaluminumhydrideproduced4-indolecarbaldehyde(13)in628yield・ ヘンSinceinterconversion3’4’5among9,4-hydroxymethylindole14(12),andl3arewell
~ 戸田グ グ祀夕established,varioussimple4-substitutedindoles(3,4,5,6,7,8,9,10,11,12, ハゲ~~~~~~~~~
13,andl4〉becamenowreadilyavailableErom3-EormY1indole(1)inhundredsgram~ へ〆
scale.
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●●● 『〃〃(』x)(】》
10.
11.
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14.
Received,24thDecember,1986
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