New Entry to
1,4,5,6‑Tetrahydro‑2H‑Indol‑2‑Ones Using a Cationic 5‑Endo‑Trigonal Cyclization Onto Enamides
著者 Ishibashi Hiroyuki, Higuchi Masahiro, Masuko Hiromi, Kodama Kazuya, Ikeda Masazumi
journal or
publication title
Heterocycles
volume 46
page range 37‑40
year 1997‑01‑01
URL http://hdl.handle.net/2297/3279
doi: https://doi.org/10.3987/com-97-s8
H∈TERO仁一YCLES.V0l.ヰ6.1997 3ア
一 丁.′ −ごi −・ ̄i−−−1‥∴・∴−!〔−〜 −.∴∴:−・・−∴.:・Jii−1ニ・二二、
_・・・二・!モーごニー し.、−ミミi−JJ 二∴−こ−・∴−.‥・ミー/J∴.・ ̄∵/ニ・・_・ノブ ニ
・_ −・_−:;..・ ̄∴−「−∴.・...− −‥、!.−∵∵∴−−こ
肋oy血貼hibashi,且*Masahi和田iguchi,1HiromiMasuko,2監a冨uya 監感ama,2昆ndMas詑um呈肱e血2
二「ハ′イ′lり/・/・l一・・ご′′両・′叫・′′・・=・′・・′恒・∴丹・∫t・‥t・・・・し′こ′証‥・・川.、∴′・人〟tF・・∫∫t・t・・′′.
−.−‖.′(i:L・・・・t・■・川・両い両′二∫二・・川・・・J∫、砧叫・・・J伸一′′ジ∫州・∴′・.、川、−∫、(中、
U∴′し・J■′′・′ソ一.、川ハれ一叫′tい
舶g細Cg叫An紺me曲od如tbesynthesまsofl,4,5,6一首細・ahyむot2好一 まm血1−2−OneSbymean50f5−g昂ゐ一打gg∂昂βgCyCliza血noぎα一曲ioc甜boca血ns 富enerated鮎msulゐⅩide(且望)andα−Chl併OSuはde(且7)isdescdbed。The
Su蜘Ⅹide(且望),叩Om heatingwiもh TsOH,gaVe掴,Which el主minated b紺Zenethiol盲Ogivete‡rahy血oindolone(且5).Byco旭ast,血echlorosul鮎e
(且冒),岬On打eatmentwithTiC14,gaVethedesu助dzedもetrahy血oindolone
(且富)℡Themechanism玩)rthefbrma血nof且呂isalsodiscussed。
旦夕4,5舟甘e揉ahy釦0−2甜−in血ト2−OneS areuSe餌1intermedi離eS玩汀th6Synthesisoぎseveralもypes¢ぎ A胴β野ggg∂αCββgalkaloids。軍orexamplesパheⅣイarylmetbyl)鹿dvatives(且:n=りhavingabromine¢r 豆感neatomon血eorがわposi血nof加甜Omaもicrlng,Wbensutjec首edtotbe独ckでeaC由oncondi由nsorto
曲e恩田3Sn雄一me血紐dradicalcyclizationcondiもions,give独elycorineskele加5(望),1andtheⅣ−(呈一 野1細yl)c甜generS(且:n=2)havingelectron−血na由g3,4−dimeぬoxygroupsom鹿野Omatic血g,Wh印 訂ea舶繭ho柑anicacまds,prOVi鹿theerythrinans誠e伽S(3).1aチ2Hereinwerepor亡am紺紺叩tO 且,4ぅ5,6−陪㍑a臨画0一之好一i旭01−ま−OneSuSlnga5一紙ゐ一雨go乃βgCyClizationoぎα一蹴ocarboca血ns3asakey
SleP・
†孤呈spa阿isde此ate飢0血ememo‡yOぎ如詣ssoほmedtusShun−ichほamada帥ived噂O官職桓0)。
HETEROCYCしES、Vol.46、1997
38し
¢ぼappmaCbto伽syn血sisoデモ紺地ydmindolonesisoutlinedinthe払1lowiれgScheme・珊ekeysもeplS 痛感5−g紹由一grgg¢柁dgCyCliza血noぎーheα一朗ocarbocations(尋)whichp和Vi由stheacyliminまum阜On まn紐me血tes(5)。Thiss紐pisthen氏)1lowedbyanelimina血nofbenzenethiolもOgivel,4,5,6一蜘ahy血℃−
3−metby抽iか2ガーindol−2−OneS(癌).Theα一面ocarbocations(名)canbeeasilydedved丘omぬe CmSpOn亜ngsulfoxidesorα−Chlorosul負des。
SPh
R
SPh
4 5
Weiniぬtedourinvestigationbyexaminingthecyclizationofthesu肋xide(且2)underthePumme陀r rearrangementcon鮎ons.The synthesisoぎ且望was be卯nbycondensatiomof2−(phenyl血io)一 cyc址ex弧Ome(7)w抽β−bromobenzylamine($)餌lowedbyⅣ−aCylationof加resultingimine(撃)wi血
bromoacetylbromideto由vethebromoacetamide(且桝in70%yまeld(basedon7)・取eatmentof且¢wi血 so血mmethylmercap舶egave,まn呂0%yield,thesul鮎e(且且),WhichwasoxidizedbysloⅥ/addi血nof椚−
CP忍Atogivethesu肋Ⅹide(且2)in60%yieldalongwiththedisulfoxi血(且3)(21%yield)・
BrCH2COBr
Eモ3N,DMAP
i一喜〒=− ̄l;l
CH2Ar
lO toluene
陀flux
CH2Cl2
00Ctort
三こ
≡=
l
苛闇謀Me
CH2Ar
椚
Ar=かBromophenyl
m−CPBA
>
CH2Cl2
−200C
CH2Ar CH2Ar
12 13
Heatingthesulfoxide(且2)inboilingl,2−dichloroethaneinthepresenceofastoichiometricamountof
TsOHfbf5mingavethehexahydmindolone(掴)andthetetrahydroindolone(且5)4in42and36%yields,
TeSPeCtively。ThelH−NMRspectrumof且超showedittobeamixtureof‡wOdiastereoisomers(Cisand transTelationshipsbetweenthephenylthioandthemethylthiogroups)inaratioofca・2:1・Theformation of且5appearsもObe血eresul亡Ofanacid−Catalyzedeliminationofbenzenethioほomtheinitialcycliza血n
HETEROCYCしES.Vot.46.1997 39
is ら
)Il O−
1e
pro血c盲(且射・Indeed,Vh紺the period ofheating oぎ且望was extended呼号030m底地e 紐江娩y血血dolone(且5)wasobtainedasasoleproductin65%yield・
Ontheo血erhand,heatingtbedisul払Ⅹide(且3)inthepresenceofTsOH(1equiv・)inboilingl,2一
触h血oe血弧e氏汀5mingaveonlythetetrahy血oindolone(且5)in60%yidd・Abulkyphenykul昆nyl 許0叩0ぎぬeinitialcyclizationproduci(且卵mig如beinpositions細′7∫tO加adjacentmeぬylthiogro叩,
組曲encea血ema圧1iminationofbenzenesul臨皿icacidappearedtooccurrap撼ytogive且雷.
SPh …㌧rr。、;こミ∵.㌻・・ニト÷
TsOH
(1eq)
12
(CH2CI)2 re‖ux
〔・HこAr
14
CH2Ar
15
ト 汀. 一皿 −n
ーーー一幸− 15
C W2Ar 16
OuTattendonwasnextturnedtotheLewisacid−PrOmOtedcyclizationofthechlorosulfide(且7),Whichwas prepared(quant.)翫)m血ecorrespondingsulnde(且且)bytreatingwithⅣCS・Whenthechloros扇員de(鼠7)
WaSeXPOSedtoastoichiometricamountofTiC14inCH2Cl2atrOOmtemPeratuTefoTlh,iwoindolone
deriva由veswereobtained。Oneofthemwasthecompound(且穏)(30%yield:aCa。5:1miⅩtureOftwo diastereoisomeTS)whichwasidenticaltothatobtained免・Om且2。互nterestingly,anOtheronewasproven富O be弧un舘peCtedproducモ(且8)(34%yield).Thel‡i一因MRspecモrumOぎ且$exhibiもedthesignalsat85.51
(dt,J=1.7,4.7Hz)and85.85(brs)duetotheole員nicprotonsaモモheC7andC3positions,geSpeCtively.
SPh 恕M:曝
ヨ 8
、・ ̄−‡?∴こ・… ̄二
CH2Ar
17
NCS
朋++ ≡陸・
GCl4
TiCl4
>
CH2Cl2
00C拍「!
CH2Ar CH2A「
14 18
1爵+
PhS!
CH2Ar 19 TiClかHC】(g)
14 CH2C:12
‖
HETER亡ICY〔:し∈S、V0l.d6.1997 穏¢
臨ゆ訂由訂官OSee血emecbanism玩)ご紬e毎mationoぎ且8(probabiyfiom風韻),SeVerale蒐pedmen組曲mswe陀 Ca感e虚o明電W油TiChandHCl卵S,宙臆1aモモegofwhicbmighta正seduri喝加蝕madonoぎ且尋誼om且冒。
彗財hemeompound(且堵)wastr組‡edeitheヂW油astoichiome離camounモOfTiChorwith調C旦gasinCH2C12 aもぎ00mtempera紬でe,Only血est好餌唱mated崩wasァecove陀dunchanged。苫ioweveァ,馳a盲mem首0ぎ且堵w油 甘iC14in蝕ep托SenCeOぎHClgasgave且雷in29%y呈舶乞Og抽erw抽ana血損ionalpro血ct(且撃)(30%
yie呈掛取e5訊ぬぎeOf且撃was鮎duced貪omまtsIH一因M鼠spe路um4andi盲SChemicaltrans董bma血n:
ぬ組曲富且野w地TsO田inbeれZenea勤訂血d且5in甜%yield。¢nepossiblera由0れ裏ization良好曲eぬma血n Of且露isbasedon加昆SSum卯10nぬも血emeぬy抽i(〕伊OupaモモheC3posまt呈onof蝕egrβ那−isomeroぎ風韻 CO甜通mates盲0甘まC払togivethe5日l払niumioni呈Iteme戯昆妃(望取組dth錯theαタZggre弘mi‡ladon∝CuぎSbyan 離抱C駄of血ecbloddei肺(dedved貪omHCl)onthe喜)henylぬiog和up拍gi甘藍且臥Tb呈sとypeOぎreacti耶,
払珊eVe君9isinap妄)1icable盲0℃hecg∫−isomeroぎ且鼻先汀ぬestereoelectronicreasons,andhence血eど言ぶ一isomeぎ ismerelypぎ0もOnatedもOg拉etheacyliminiumintemediate(望且).Thephe叩抽iogroupof望且undeァgoes
l,2−mi卵血n血ougbtbeepisulねniumsalt望望toglVetheobserved且軌5
Ch け一⁚≠小
SPh
SMe
O
ーー園瑠窃
硝 P
−−一歩−19,
6日2AF 望瑠
CH=A「
霊芝
甘地swe陀Vealedthat血e5−ピアZ(わーgrggOタZβgCyClizationofα一thioc訂bocationsgen弧嘘d甜omthesu眼)蒐i由
(且望)amdぬechlorosu抗de(且7)provi鮎danewme血odぬr血esyntbesisoぎadi壬籠renモモypeofl,4,5,6−
もeぱahy血0−2ガーiれdoト2−OneSSuChas凰5and且臥Anapplicationof血emethodto血esyれthesisoぎ1ycodne and母野血dnaa肱裏oidswillbeヱ℃pOriedin如ecourse.
配EFEREFJCES AF旧 PJOTES
且。(a)乱]ほ.殴igby andM.qabar9J、如才,Cゐe〝Z,ぶoc。,19919鳳凰3,8975;(b)J。H。汲igby,殴.C。
Ht唱bes,andM.J.Heeg,才.加l.C如乱gOC.フ1995,且且7,7834;(C)J。H.鼠igbyandM。巳Mateo,
∴・い小.∴J,・、・.Jl−、−、t,、∴ =ド、!!ニ
2.A.Mondon,J。芝ander,am=軋−U.Menz,£gβ占∫g∫A肌Cムピアプ7,,1963,6痴ヲ,126.
3。Y。Tamura9H。Maeda,S.Akai,and壬i。‡shibashi,TetrahedronLett。?1982,望3,2209;H.Ishibashi,
監.Sato,討宜。互keda,H.Mae血,S.Akai,andY。Tamura,才.Cゐg乱ざocリグgr&gタZア招弧g,1985,605;
H。亙shibashiandM.Ikeda,鮎γ.ガ2ggrOβgO椚Cゐe乱,1992,ヲ91別。
礼]庖一因M監ぬ㌃且5(300MHz,CむC13)ニ∂1。83(qui鴫才=6.1田三,2軌2.28(q,♂=6.1H冨,2H),2.55
(S,3盟),2。66(t,㌔=6.5Hz,2H),4朋(S,2H),6。46(盲,才=軋7Hz,2H),6。95−7.55(m,4H)。『or 且凱あ1.2−3.0(m,8H),2。53(S,3貴弘4。71(且ブ=ま5,6日z,1日),4.98牲才=15.6Hz,1報),7。05−
7.60(m99壬恥
5。‡もSeemSぎeaSOnabletoas紬methaモモhereactionof且7giv呈ng風韻and乱蕗provide5alsothecompound 且軌b朗mOCO‡TObor姐ngevid紺Ce知thisassumptlOniso鈍reda‖hemome眈
Recejved,16thJanuary,1997