JP2011503226A - アミノ酸誘導体の立体選択的製造方法 - Google Patents
アミノ酸誘導体の立体選択的製造方法 Download PDFInfo
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- JP2011503226A JP2011503226A JP2010534508A JP2010534508A JP2011503226A JP 2011503226 A JP2011503226 A JP 2011503226A JP 2010534508 A JP2010534508 A JP 2010534508A JP 2010534508 A JP2010534508 A JP 2010534508A JP 2011503226 A JP2011503226 A JP 2011503226A
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- optical isomer
- mesitylalanine
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- 229940088597 hormone Drugs 0.000 description 1
- 239000005556 hormone Substances 0.000 description 1
- 150000002429 hydrazines Chemical class 0.000 description 1
- 239000000852 hydrogen donor Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- HNQIVZYLYMDVSB-UHFFFAOYSA-N methanesulfonimidic acid Chemical compound CS(N)(=O)=O HNQIVZYLYMDVSB-UHFFFAOYSA-N 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 238000010647 peptide synthesis reaction Methods 0.000 description 1
- COLNVLDHVKWLRT-UHFFFAOYSA-N phenylalanine Natural products OC(=O)C(N)CC1=CC=CC=C1 COLNVLDHVKWLRT-UHFFFAOYSA-N 0.000 description 1
- 150000003003 phosphines Chemical class 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 238000002953 preparative HPLC Methods 0.000 description 1
- 238000000425 proton nuclear magnetic resonance spectrum Methods 0.000 description 1
- 229960000948 quinine Drugs 0.000 description 1
- 108020003175 receptors Proteins 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- QBERHIJABFXGRZ-UHFFFAOYSA-M rhodium;triphenylphosphane;chloride Chemical compound [Cl-].[Rh].C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 QBERHIJABFXGRZ-UHFFFAOYSA-M 0.000 description 1
- 238000007142 ring opening reaction Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000010532 solid phase synthesis reaction Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 125000005420 sulfonamido group Chemical group S(=O)(=O)(N*)* 0.000 description 1
- CZDYPVPMEAXLPK-UHFFFAOYSA-N tetramethylsilane Chemical compound C[Si](C)(C)C CZDYPVPMEAXLPK-UHFFFAOYSA-N 0.000 description 1
- DTQVDTLACAAQTR-UHFFFAOYSA-N trifluoroacetic acid Substances OC(=O)C(F)(F)F DTQVDTLACAAQTR-UHFFFAOYSA-N 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- 229960003726 vasopressin Drugs 0.000 description 1
- 239000011995 wilkinson's catalyst Substances 0.000 description 1
Classifications
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Abstract
【化1】
Description
a)式(II)の化合物、又は、その光学異性体(II’)を得るために、式(III)の化合物、又は、その光学異性体(III’)に対して水素化反応を行う。式中、Rは(C1−C8)アルキルである;
790mg(1.0mmol)の(DHQ)2PHAL、100g(302mmol)のK3Fe(CN)6、41.7g(302mmol)のK2CO3及び149mg(0.403mmol)のK2OsO4(OH)4を2Lの反応器に投入し、1LのH2O:tBuOH(1:1)混合液で溶解した。次に、9.5g(100mmol)のメタンスルホンアミドを加えた。15分間攪拌を維持し、次に、22.0g(100mmol)のエチル3−メシチル−2−プロペノアートを加えた。反応混合物は48時間室温で攪拌を維持した。48時間経過後、Na2SO3(180g)を加え、反応を停止した。2時間攪拌を維持し、最終的に、CH2Cl2(3×150mL)を用いて水相を抽出した。すべての有機相を2N KOH水溶液で洗浄し、MgSO4で乾燥し、溶媒を減圧下で濃縮した。24.3g(収率97%)の生成物(2R,3S)−VIaが黄色の油状で得られた。[α]D=−24.7(c0.98,CHCl3),IR(フィルム):ν max3441(b),2978,1733,1611,1190cm−1,1H NMR(400MHz,CDCl3)δ:6.80(s,2H),5.18(d,1H,J=6.4Hz),4.51(d,1H,J=6.4Hz),4.04(q,2H,J=7Hz),3.18(b,1H),2.86(b,1H),2.40(s,6H),2.24(s,3H),1.00(t,3H,J=7Hz)ppm.13C NMR(100MHz,CDCl3)δ 173.0(CO),137.4(C),136.8(C),131.8(C),130.3(CH),73.8(CH),73.7(CH),61.9(CH2),21.0(CH3),20.9(CH3),13.7(CH3)ppm.EM(CI-NH3)m/z:270.1[(M+18)+,100%],252.1[(M)+,60%],HRMS(CI+):C14H20O4計算値:252.1361,252.1357検出,HPLC:Chiralpack−AD,ヘキサン/i−PrOH 98:2,1mL/分,λ=254nm,tR(S,R)=44分及びtR(R,S)=41分。
95%の収率でエチル(2S,3R)−ジヒドロキシ−3−メシチルプロパン酸を得るためにリガンド(DHQD)2PHALを用いて、同様のプロセスを行った。
23.5g(93mmol)のジオールエチル(2R,3S)−ジヒドロキシ−3−メシチルプロパン酸を1.4LのCH2Cl2を用いて反応器で溶解した。次に、38.9mL(279mmol)のNEt3を加えた。反応混合物を0℃で冷却し、5分間攪拌を維持した。最後に、9.5mL(130.4mmol)のSOCl2を液滴で加え、0℃で15分間攪拌を維持した。その後、370mLのEt2Oと370mLの水を加えた。Et2O(3×150mL)を用いて水相を抽出し、すべての有機相をNaCl飽和溶液で洗浄し、MgSO4で乾燥し、溶媒を減圧下で濃縮した。(4R,5S)−Vaの亜硫酸塩が油状で定量的に得られた。[α]D=−18.8(c1.00,CHCl3),IR(フィルム):ν max2979,1742,1216,1030cm−1,1H NMR(400MHz,CDCl3)δ:6.90(s,2H),6.89*(s,2H),6.61(d,1H,J=8Hz),5.95*(d,1H,J=10Hz),5.35*(d,1H,J=10Hz),4.96(d,1H,J=8Hz),4.30(dq,2H,J=20及び7Hz),4.22*(m,2H),2.45*(s,6H),2.37*(s,6H),2.28(s,6H),1.31(t,3H,J=7Hz),1.22*(t,3H,J=7Hz)ppm.13C NMR(100MHz,CDCl3)δ168.0(CO),166.2(CO),139.9(C),139.8(C),138.4(C),138.2(C),131.0(CH),130.9(CH),125.6(C),122.6(C),84.9(CH),80.6(CH),80.3(CH),76.0(CH),62.8(CH2),21.07(CH3),21.06(CH3),20.5(CH3),20.2(CH3),14.2(CH3),14.0(CH3)ppm.EM(CI−NH3)m/z:315.6[(M+17)+,100%],HRMS(CI+):C14H18O5S計算値:298.0875,298.0876検出。
18.6g(62.95mmol)の(4R,5S)−4−エトキシカルボニル−5−メシチル−1,3,2−ジオキサチオラン−2−オキシドを386mLのN,N−ジメチルホルムアミド(DMF)を用いて二口フラスコ中で溶解し、冷却剤を与え、8.2g(125.9mmol)のNaN3を加えた。反応混合物を100℃で18時間加熱した。この時間の経過後、溶媒を減圧下で除去し、その結果得られた粗生成物を310mLのEt2O及び310mLの20%H2SO4溶液で溶解し、室温で一晩中攪拌を維持した。過剰量のNaHCO3飽和溶液を加え、Et2O(3×150mL)を用いて水相を抽出した。すべての有機相をMgSO4で乾燥し、溶媒を減圧下で濃縮した。反応の粗生成物をカラムクロマトグラフィー(SiO2/NEt3 2.5%v/v,ヘキサン/AcOEt)によって精製し、13.6g(収率78%)の黄色の油状のアジドアルコール(2S,3S)−IVaを得た。[α]D=−126(c0.795,CHCl3),IR(フィルム):ν max3468(b),2924,2105,1737,1610,1257cm−1,1H NMR(400MHz,CDCl3)δ:6.88(s,2H),5.19(d,1H,J=8.8Hz),4.45(dd,1H,J=7及び9Hz),4.33(m,2H),2.52(d,1H,J=7Hz),2.43(s,6H),2.26(s,3H),1.36(t,3H,J=7Hz)ppm.13C NMR(100MHz,CDCl3)δ173.0(CO),138.4(C),137.6(C),130.66(CH),130.56(CH),128.6(C),72.1(CH),64.1(CH),62.4(CH2),21.0(CH3),20.9(CH3),14.2(CH3)ppm.EM(CI−NH3)m/z:295.3[(M+18)+,90%],HRMS(ESI):C14H19N3O3Na計算値:300.1315,300.1318検出。
13.0g(46.72mmol)のアジドアルコールエチル(2S,3S)−3−アジド−2−ヒドロキシ−3−メシチルプロパン酸をフラスコに投入し、282mLのアセトニトリルで溶解し、次に、12.2g(46.72mmol)のPPh3を加えた。反応混合物を室温で1時間、還流温度で6時間攪拌した。この時間の経過後、溶媒を減圧で除去し、粗生成物をカラムクロマトグラフィー(SiO2/NEt3 2.5%v/v,ヘキサン/AcOEt)によって精製した。7.32g(収率67%)のアジリジン(2R,3S)−IIIaを黄色の油として得た。[α]D=−131(c0.79,CHCl3),IR(フィルム):ν max3281,2978,2922,1726,1218,1201cm−1,1H NMR(400MHz,CDCl3)δ:6.82(s,2H),4.31(m,2H),3.16(d,1H,J=2Hz),2.57(d,1H,J=2Hz),2.39(s,6H),2.26(s,3H),1.78(b,1H),1.36(t,3H,J=7Hz)ppm.13C NMR(100MHz,CDCl3)δ172.8(CO),137.8(C),137.3(C),129.0(CH),61.8(CH2),38.9(CH),37.8(CH),20.9(CH3),20.0(CH3),14.4(CH3)ppm.EM(CI−NH3)m/z:233.0[(M)+,25%],146.0[(M−87)+,100%],HRMS(CI+):C14H19NO2計算値:233.1416,233.1418検出,HPLC:Chiralpack−IA.ヘプタン/i−PrOH 95:5,1mL/分,λ=254nm,tR(S,R)=19分及びtR(R,S)=14分。エチル(2R,3S)−3−メシチル−アジリジン−2カルボン酸の光学純度は>99%eeであった。
9.9g(42.42mmol)のアジリジンエチル(2R,3S)−3−メシチル−アジリジン−2−カルボン酸を高圧反応器内で300mLのメタノールで溶解し、次に、990mgのPd/C及び10mLの酢酸(84.84mmol)を加えた。この系を真空/窒素循環でパージし、反応器を40バールで加圧した。室温で48時間、反応混合物の攪拌を維持した。その後、セライト濾過によって触媒を除去し、その溶液を減圧下で濃縮した。黄色い固体状の化合物(IIa)を定量的に得た。Mp81−83℃,[α]D=−26.7(c1.00,CHCl3),IR(フィルム):ν max2918,1742,1612,1483,1225,1H NMR(400MHz,CDCl3)δ:6.84(s,2H),5.61(b,1H),4.14(m,2H),3.77(dd,1H,J=6.4及び7.6Hz),3.08(m,2H),2.94(m,2H),2.31(s,6H),2.25(s,3H),1.18(t,3H,J=7Hz)ppm.13C NMR(100MHz,CDCl3)δ:178.9(CO),137.1(C),136.3(C),131.1(C),129.5(CH),129.5(CH),129.2(C),61.4(CH2),54.1(CH),34.6(CH2),24.9(CH3),21.0(CH3),19.8(CH3),14.2(CH3)ppm.EM(ESI+)m/z:236.2[(M+H)+,100%],HRMS(ESI+):C14H22NO2計算値:236.1645,236.1637検出。
2.0g(8.50mmol)のアミノエステル(2S)−メシチルアラニンエチルエステルをフラスコ中で57mLのジオキサンで溶解し、次に、70mLの20%LiOH溶液を加えた。反応混合物を室温で24時間攪拌した。最終的に、減圧下で溶媒を除去し、その水相を冷却し、1Mの塩酸でpH7に調整した。濾過とその後の真空乾燥によって分離された結晶の沈殿物が認められた。1.3g(収率80%)のアミノ酸Iaが白い固体状で得られた。Mp:318−320℃,[α]D=−80(c1.00,CH3OH),IR(フィルム):ν max3300,2973,1730,1608,1409cm−1,1H NMR(400MHz,CDCl3)δ:6.75(s,2H),3.27(t,1H,J=7.2Hz),2.88(m,1H),2.65(m,1H),2.12(s,6H),2.05(s,3H)ppm.13C NMR(100MHz,CDCl3)δ:181.8(CO),137.8(C),136.4(C),132.2(C),128.9(CH),56.2(CH),34.3(CH2),19.9(CH3),19.4(CH3)ppm.EM(CI+)m/z:208.3[(M+H)+,100%],HRMS(CI+):C12H18NO2計算値:208.1337,208.1330検出,C27H27NO4分析、計算値:C 71.46,H 8.99,N 5.95;C 71.36,H 8.69,N 6.39検出。
1.08g(5.22mmol)のアミノ酸L−メシチルアラニンをフラスコ中で16mLの10%Na2CO3溶液で懸濁し、0℃で冷却した。次に、24mLのジオキサンに溶解したFmoc−OSu(2.64g,7.83mmol)溶液を液滴で加えた。反応混合物を室温で20時間攪拌し、その後、水(20ml)を加え、ヘキサン(3×20ml)を用いて抽出した。得られた水相を0℃で冷却し、1Mの塩酸でpH2に調整し、酢酸エチルを用いて抽出した。得られた有機相のグループをMgSO4で乾燥し、減圧下で溶媒を除去した。粗生成物をカラムクロマトグラフィー(SiO2/NEt3 2.5%v/v,ヘキサン/AcOEt)によって精製し、白い固体として1.5g(収率68%)のIpが得られた。Mp:187−188℃,[α]D=−26.04(c1.00,CHCl3),IR(フィルム):ν max3321,2962,1713,1450,1265cm−1,1H NMR(400MHz,CDCl3)δ:7.74(d,2H,J=7.6Hz),7.51(t,2H,J=7.6Hz),7.40(t,2H,J=7.6Hz),7.30(t,2H,J=7.6Hz),6.83(s,2H),5.25(d,1H,J=8Hz),4.60(dd,1H,J=8.0及び8.4Hz),4.30(m,1H),4.14(m,1H),3.18(m,2H),2.32(s,6H),2.21(s,6H)ppm.13C NMR(100MHz,CDCl3)δ:176.7(CO),156.08(CO),144.0(C),141.5(C),137.2(C),136.6(C),130.0(C),129.6(C),129.5(CH),127.9(CH),127.3(CH),125.3(CH),120.2(CH),67.4(CH2),53.7(CH2),47.3(CH),32.5(CH2),21.3(CH3),20.4(CH3)ppm.EM(CI−NH3)m/z:206.09[(M−233)+,82%],430.2[(M+H)+,5%],HRMS(CI+):C27H28NO4計算値:430.2029;430.2018検出。C27H27NO4分析、計算値:C 75.50,H 6.34,N 3.26;C 74.94,H 6.21,N 3.41検出,HPLC:Chiralcel−AD,ヘプタン/EtOH/TFA 95:5:0.2,1mL/分,λ=254nm,tR(D)=20分,ytR(L)=26分,L−Ipの光学純度は>99%eeであった。
100mg(0.06mmol)のリンクアミド樹脂をシリンジに供給した。それをCH2CL2(5×1分)及びDMF(5×1分)で調整した。結合試薬としてジイソプロピルカルボジイミド(DIPCDI)、添加物としてヒドロキシベンゾトリアゾール(HOBt)を用いて、標準のFmoc/tBuストラテジー法によって合成を行った。Fmoc−3−(1−ナフチル)−L−Ala−OH(Fmoc−Nal)(78.75mg,0.18mmol,3eq)、Fmoc−L−Val−OH(61.2mg,0.18mmol,3eq)及びFmoc−D−メシチルアラニン−OH(Fmoc−D−Msa)(77.4mg,0.18mmol,3eq)を用いて、アミノ酸の連続的な導入をニンヒドリンテストで確認した。3番目のアミノ酸を導入した後、DMF中のピペリジン混合物を用いてFmoc基を除去し、遊離のアミノ末端をAc2O-ジイソプロピルジエチルアミン(DIEA)を用いてアセチル化した。最終的に、樹脂を濾過し、DMF(5×1分)、CH2CL2(5×1分)及びメタノール(5×1分)を用いて十分に洗浄した。トリペプチドを切断するために、トリフルオロ酢酸−水−トリイソプロピルシラン(TFA−H2O−TIS)(95:2.5:2.5)溶液で1時間処理し、濾過溶液を濃縮した。それを逆相クロマトグラフィー(HPLC分析)とEMによって特性化した。9ステップの合成後、中間精製なしで得られた粗生成物は、39%の純度であった。分取HPLC(勾配:20−50/10分間、及び、50−100/15分間)で精製し、3.4mgのトリペプチドが86%の純度(λ=220nm)で得られた。HPLC−MS:tr(H2O 0.1%HCOOH;ACN 0.07%HCOOH)=4.830分,ES+:545.65(calc.C32H40N4O4,544.30)。
100mg(0.06mmol)のリンクアミド樹脂をシリンジに供給した。それをCH2CL2(5×1分)及びDMF(5×1分)で調整した。結合試薬としてジイソプロピルカルボジイミド(DIPCDI)、添加物としてヒドロキシベンゾトリアゾール(HOBt)を用いて標準のFmoc/tBuストラテジー法によって合成を行った。Fmoc−L−Lys(Boc)−OH(84.33mg,0.18mmol,3eq)、Fmoc−L−Val−OH(61.2mg,0.18mmol,3eq)及びFmoc−D−Msa−OH(77.4mg,0.18mmol,3eq)を用い、アミノ酸の連続的な導入をニンヒドリンテストで確認した。3番目のアミノ酸を導入した後、DMF中のピペリジン混合物を用いてFmoc基を除去し、遊離のアミノ末端をAc2O-ジイソプロピルジエチルアミン(DIEA)を用いてアセチル化した。最終的に、樹脂をろ過し、DMF(5×1分)、CH2CL2(5×1分)及びメタノール(5×1分)を用いて十分に洗浄した。トリペプチドを切断するために、トリフルオロ酢酸−水−トリイソプロピルシラン(TFA−H2O−TIS)(95:2.5:2.5)溶液で1時間処理し、濾過溶液を濃縮した。それを逆相クロマトグラフィー(HPLC分析)とEMによって特性化した。9ステップの合成後、中間精製なしで、得られた粗生成物は、52%の純度であった。イオン交換カラム法で精製し、7.3mgのトリペプチドが96%の純度(λ=220nm)で得られた。HPLC−MS:tr(H2O 0.1%HCOOH;ACN 0.07%HCOOH)=3.856分,ES+:476.57(calc.C25H41N5O4,475.32)。
100mg(0.06mmol)のリンクアミド樹脂をシリンジに供給した。それをCH2CL2(5×1分)及びDMF(5×1分)で調整した。結合試薬としてジイソプロピルカルボジイミド(DIPCDI)、添加物としてヒドロキシベンゾトリアゾール(HOBt)を用いて標準のFmoc/tBuストラテジー法によって合成を行った。Fmoc−L−Lys(Boc)−OH(84.33mg,0.18mmol,3eq)、Fmoc−L−Asp−OtBu−OH(74.07mg,0.18mmol,3eq)及びFmoc−D−Msa−OH(77.4mg,0.18mmol,3eq)を用い、アミノ酸の連続的な導入をニンヒドリンテストで確認した。3番目のアミノ酸を導入した後、DMF中のピペリジン混合物を用いてFmoc基を除去し、遊離のアミノ末端をAc2O-ジイソプロピルジエチルアミン(DIEA)を用いてアセチル化した。最終的に、樹脂をろ過し、DMF(5×1分)、CH2CL2(5×1分)及びメタノール(5×1分)を用いて十分に洗浄した。トリペプチドを切断し、アミノ酸側鎖からBoc及びtBu保護基を除去するために、トリフルオロ酢酸−水−トリイソプロピルシラン(TFA−H2O−TIS)(95:2.5:2.5)溶液で1時間処理し、濾過溶液を濃縮した。それを逆相クロマトグラフィー(HPLC分析)とEMによって特性化した。9の合成段階後、中間精製なしで、得られた粗生成物は、71%の純度であった。イオン交換カラム法で精製し、17.0mgのトリペプチドが94%の純度(λ=220nm)で得られた。HPLC−MS:tr(H2O 0.1%HCOOH;ACN 0.07%HCOOH)=2.543分。ES+:492.58(calc.C24H37N5O6,491.27)。
Claims (14)
- 式(I)の化合物、又は、その光学異性体(I’)の実質的に純粋な光学異性体の立体選択的な製造方法であって;
以下のステップを含む立体選択的な製造方法:
a)式(II)の化合物、又は、その光学異性体(II’)を得るために、式(III)の化合物、又は、その光学異性体(III’)に対して水素化反応を行うステップ;
b)式(I)の化合物、又は、その光学異性体(I’)を得るために、式(II)の化合物、又は、その光学異性体(II’)に対して加水分解反応を行い、任意に、前記化合物(I)、又は、その光学異性体(I’)[式中、Pは水素である]に対してアミノ基保護反応を行うステップ。 - Pが、9−フルオレニルメチルカルバメート(Fmoc)、t−ブトキシカルボニル(BOC)、ベンジルオキシカルボニル(Cbz)、アリル、4−メトキシベンジル、2,4−ジメトキシベンジル及びベンジルから成る群より選択される請求項1に記載の立体選択的な製造方法。
- 前記水素化反応を行うステップが、触媒として金属又は金属錯体を用いて行われる請求項1又は2に記載の立体選択的な製造方法。
- 前記加水分解反応が、塩基性媒体中で行われる請求項1〜3のいずれか1項に記載の立体選択的な製造方法。
- 前記加水分解反応の塩基が、アルカリ金属の水酸化物である請求項4に記載の立体選択的な製造方法。
- 式(III)の化合物、又は、その光学異性体(III’)を得るために、式(IV)の化合物、又は、その光学異性体(IV’)が、式P(R1)3[式中、R1は、(C1−C8)−アルキル、(C1−C8)−シクロアルキル、任意に置換されたフェニル、任意に置換された(CH2)n−フェニル(式中、nは1〜4の整数であり、ベンゼン環を有する基の置換基は、(C1−C8)−アルキル、(C1−C8)−アルコキシル又はハロゲンから成る群より、独立して選択される)から成る群より、独立して選択される]のホスフィンと反応する請求項1〜5のいずれか1項に記載の立体選択的な製造方法;
- 前記適切なキラルリガンドが、式(VI)の化合物を得るヒドロキニン1,4−フタラジンジイルジエーテル((DHQ)2PHAL)、又は、式(VI’)の化合物を得るヒドロキニジン1,4−フタラジンジイルジエーテル((DHQD)2PHAL)から成る群より選択される請求項9に記載の立体選択的な製造方法。
- Fmoc−(L)−メシチルアラニン。
- Fmoc−(D)−メシチルアラニン。
- 1つ以上のメシチルアラニン残基を有する固相におけるペプチドの製造方法であって、Fmoc−(L)−メシチルアラニン、Fmoc−(D)−メシチルアラニン、Cbz−(L)−メシチルアラニン、Cbz−(D)−メシチルアラニン、アリル−(L)−メシチルアラニン、アリル−(D)−メシチルアラニン、4−メトキシベンジル−(L)−メシチルアラニン、4−メトキシベンジル−(D)−メシチルアラニン、2,4−ジメトキシベンジル−(L)−メシチルアラニン、2,4−ジメトキシベンジル−(D)−メシチルアラニン、ベンジル−(L)−メシチルアラニン、及び、ベンジル−(D)−メシチルアラニンから成る群より選択されるN−保護アミノ酸の使用が含まれる製造方法。
- 請求項1〜10のいずれか1項の立体選択的な製造方法を行うことを含む、1つ以上のメシチルアラニン残基を有する固相におけるペプチドの製造方法。
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