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A convenient synthetic approach to 4-substituted indoles

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(1)

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

(2)

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-

(3)

Tl(OCOCF 旨3)2

00Me COOMe

O■j--

Cpl

CHO

l1

OOMe

Tl(OCOCF3)2

HO

0コ一○コ-0

グレ 8 11

a・pC ●●●●●● xxx Br C1

COOMe

HO OOH

--

0コ

H 3

|⑫

ヘジ

CN CHO

HO OOH

-- --

7 10 H 13

-1174-

(4)

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.

REFERENCESANDNOTES

1.ThisreportispartXXXVエェェofaseriesentitledIoTheChemistrYoモェndolesIo・

PartXXXVエェ8M.Somei,F、Yamada,andY・Makita,Heterocycles,inpress,26.

2.a)M、Somei,K・Kizu,M,Kunimoto,andF、Yamada,Chem・Pharm・Bull.,33,3696グー

(1985);b)、1.SomeiandM・Tsuchiya,Che、、PharmoBul1.,29,3145(1981);デ、'

c)M、MatsuInoto,Y,工shida,andN、Hatanaka,’'二型昌2凹ニユニニ,翌,1667(1986);

d)P.。.Harringt。nandL.S・Hegedus,Lニーニ」ユニュ.,淫,2657(1984).

3.a)N・Hatanaka,N・Watanabe,andM・Matsumoto,聖一望,空,1987(1986);

b)Ⅲ、Somei,F,Yamada,Y・Karasawa,andC・Kaneko,ChemistryLe生.,1981,615;ヘリ、ヘヘジー

M、Somei,Y・Karasawa,andC・Kaneko,ibid.,1980,813;c)且.P、Kozikowski,H, ̄グーやバグ、タ

エshida,andY.-Y・Chen,L--2且一旦ユニ、L、,蛭,3350(1980).

4.a)N・HatanakaandM・Matsumoto,11旦些三222匹Lニニ,翌,1963(1986);b)R、D・C1ark andC.B、Repke,11生ニュー2ニエニLニニ,婆,195(1984);c)R、D・Clark,L-ニニニ

-1175-

(5)

Che、.,20,1393(1983川。)G・SoPonticelloandj.。.Ba1dwin, ̄E些巫。,筆,

 ̄~

4003(1979);e)F・Troxler,Z1.Harnisch,G・Bormann,F・Seeman,andLoSzabo,

Helv.Chim・Acta.,51,1616(1968);E)F、C・Uhre,。.A、、Chem・SOC.,71,761 グ笛グ

(1949)

a)T・Sakamoto,Y・Kondo,andH・Yamanaka,IIeterocYc1eS,

b)MSomei,Y、Karasawa,T・Shoda,andC・Kaneko,Che、.

5. 22,1347(1984); デー

Pharm・Buエユ.,29,249デ、〆

(1981);c)L・エ.Kruse,旦旦」竺旦ニエニェニ,唖,1119(1981);d)M・SomeiandM・

Natsume,TetrahedronLetE.,1973,2451;e)T・Watanabe,F・Hamaguchi,andS・ハリー ̄、グ

Ohki,Che、、Pharm・Bu11.,20,2エ23(1972).デL夕

、【・SomeiandF・Yamada,Qhem・Pharm・BuU.,32,5064(1984);Ⅲ、Somei,Y、

6.

へ=

makita,andF、Yamada,ibid.,34,948(1986).'、P

R.C・RarockandC.Z1.Fel1。WS,。.Aエn.Che、、SOC.,104,1900(1982).P、'V、シ

E、C、TaylorandZk.H、Katz,TetrahedronLett.,25,5473(1984).グ、戸

VariousoxidationconditionsvvereexaminedusingCrO3,PCC,andKllnO4,buta11

attemptstoobtain8awereunsuccessful. ’、〆

B・S・Ba1,W、E・Childers,。r、,andH.W・Pinnick,Tetrahedron,37,2091(1981).ヂ、〆

Ⅱ.。・Corey,N・N・Gilman,andB.E・Ganem,。.ZAm,Chem・SOC.,90,5616(1968).

●●● 『〃〃(』x)(】》

10.

11.

12. Meltingpointsofl4bandl4c,reportedinourPreviouspaPer’ 夕U■ジ グ、夕V

~2ashouldbe revisedtol13.0-114.0°C(recrYstallized造romMeOH-H20)and153.0-155.0°C

(recrystal1izedfromCH2Cl2-lrhexane)’resPective1y。

H・p1ieninger,M、H6bel,andV、Liede,Qhem・Ber.,96,1618(1963);

13.

'、〆

H、P1ieninger,ibid.,88,370(1955). ̄グ、〆

M・SoJneiandT・Shoda,lユュニ」22皿坐旦,1J,417(1982)andreferencescited

therein.

14.

Received,24thDecember,1986

-1176-

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