JP5097104B2 - 新規イソジペプチド - Google Patents
新規イソジペプチドInfo
- Publication number
- JP5097104B2 JP5097104B2 JP2008501692A JP2008501692A JP5097104B2 JP 5097104 B2 JP5097104 B2 JP 5097104B2 JP 2008501692 A JP2008501692 A JP 2008501692A JP 2008501692 A JP2008501692 A JP 2008501692A JP 5097104 B2 JP5097104 B2 JP 5097104B2
- Authority
- JP
- Japan
- Prior art keywords
- group
- synthesis
- peptide
- reaction
- valine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 108090000765 processed proteins & peptides Proteins 0.000 claims abstract description 37
- -1 N-protected amino Chemical group 0.000 claims abstract description 16
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims abstract description 15
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims abstract description 15
- 125000000217 alkyl group Chemical group 0.000 claims abstract description 14
- 238000003786 synthesis reaction Methods 0.000 claims description 24
- 230000015572 biosynthetic process Effects 0.000 claims description 23
- 238000006243 chemical reaction Methods 0.000 claims description 21
- 229940024606 amino acid Drugs 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 16
- 150000001413 amino acids Chemical class 0.000 claims description 12
- 125000002252 acyl group Chemical group 0.000 claims description 11
- 239000000470 constituent Substances 0.000 claims description 11
- 238000006462 rearrangement reaction Methods 0.000 claims description 11
- 230000002194 synthesizing effect Effects 0.000 claims description 11
- LOKCTEFSRHRXRJ-UHFFFAOYSA-I dipotassium trisodium dihydrogen phosphate hydrogen phosphate dichloride Chemical compound P(=O)(O)(O)[O-].[K+].P(=O)(O)([O-])[O-].[Na+].[Na+].[Cl-].[K+].[Cl-].[Na+] LOKCTEFSRHRXRJ-UHFFFAOYSA-I 0.000 claims description 10
- 239000002953 phosphate buffered saline Substances 0.000 claims description 10
- 125000003088 (fluoren-9-ylmethoxy)carbonyl group Chemical group 0.000 claims description 9
- 239000004473 Threonine Substances 0.000 claims description 9
- 229960001153 serine Drugs 0.000 claims description 9
- 229960002898 threonine Drugs 0.000 claims description 9
- 108010016626 Dipeptides Proteins 0.000 claims description 8
- MTCFGRXMJLQNBG-REOHCLBHSA-N (2S)-2-Amino-3-hydroxypropansäure Chemical compound OC[C@H](N)C(O)=O MTCFGRXMJLQNBG-REOHCLBHSA-N 0.000 claims description 7
- AYFVYJQAPQTCCC-GBXIJSLDSA-N L-threonine Chemical compound C[C@@H](O)[C@H](N)C(O)=O AYFVYJQAPQTCCC-GBXIJSLDSA-N 0.000 claims description 7
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 4
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 4
- 125000005931 tert-butyloxycarbonyl group Chemical group [H]C([H])([H])C(OC(*)=O)(C([H])([H])[H])C([H])([H])[H] 0.000 claims description 4
- 125000006239 protecting group Chemical group 0.000 abstract description 11
- 102000004196 processed proteins & peptides Human genes 0.000 abstract description 8
- 125000003118 aryl group Chemical group 0.000 abstract description 5
- 125000001072 heteroaryl group Chemical group 0.000 abstract description 5
- 125000003710 aryl alkyl group Chemical group 0.000 abstract description 4
- 229920001184 polypeptide Polymers 0.000 abstract description 3
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 abstract description 2
- 238000010189 synthetic method Methods 0.000 abstract 1
- 150000001875 compounds Chemical class 0.000 description 17
- 229910052739 hydrogen Inorganic materials 0.000 description 11
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- 238000007796 conventional method Methods 0.000 description 5
- 238000010647 peptide synthesis reaction Methods 0.000 description 5
- 238000010532 solid phase synthesis reaction Methods 0.000 description 5
- UGNIYGNGCNXHTR-SFHVURJKSA-N (2s)-2-(9h-fluoren-9-ylmethoxycarbonylamino)-3-methylbutanoic acid Chemical compound C1=CC=C2C(COC(=O)N[C@@H](C(C)C)C(O)=O)C3=CC=CC=C3C2=C1 UGNIYGNGCNXHTR-SFHVURJKSA-N 0.000 description 4
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 4
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 4
- 238000004128 high performance liquid chromatography Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000006340 racemization Effects 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 238000007086 side reaction Methods 0.000 description 4
- BDNKZNFMNDZQMI-UHFFFAOYSA-N 1,3-diisopropylcarbodiimide Chemical compound CC(C)N=C=NC(C)C BDNKZNFMNDZQMI-UHFFFAOYSA-N 0.000 description 3
- ASOKPJOREAFHNY-UHFFFAOYSA-N 1-Hydroxybenzotriazole Chemical compound C1=CC=C2N(O)N=NC2=C1 ASOKPJOREAFHNY-UHFFFAOYSA-N 0.000 description 3
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- 125000003277 amino group Chemical group 0.000 description 3
- 238000005886 esterification reaction Methods 0.000 description 3
- 239000011541 reaction mixture Substances 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- FHOAKXBXYSJBGX-YFKPBYRVSA-N (2s)-3-hydroxy-2-[(2-methylpropan-2-yl)oxycarbonylamino]propanoic acid Chemical compound CC(C)(C)OC(=O)N[C@@H](CO)C(O)=O FHOAKXBXYSJBGX-YFKPBYRVSA-N 0.000 description 2
- VHYFNPMBLIVWCW-UHFFFAOYSA-N 4-Dimethylaminopyridine Chemical compound CN(C)C1=CC=NC=C1 VHYFNPMBLIVWCW-UHFFFAOYSA-N 0.000 description 2
- WDYVUKGVKRZQNM-UHFFFAOYSA-N 6-phosphonohexylphosphonic acid Chemical compound OP(O)(=O)CCCCCCP(O)(O)=O WDYVUKGVKRZQNM-UHFFFAOYSA-N 0.000 description 2
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 2
- OKKJLVBELUTLKV-MZCSYVLQSA-N Deuterated methanol Chemical compound [2H]OC([2H])([2H])[2H] OKKJLVBELUTLKV-MZCSYVLQSA-N 0.000 description 2
- NQRYJNQNLNOLGT-UHFFFAOYSA-N Piperidine Chemical compound C1CCNCC1 NQRYJNQNLNOLGT-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000013543 active substance Substances 0.000 description 2
- 238000003776 cleavage reaction Methods 0.000 description 2
- 150000002148 esters Chemical group 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 238000005984 hydrogenation reaction Methods 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- RLSSMJSEOOYNOY-UHFFFAOYSA-N m-cresol Chemical compound CC1=CC=CC(O)=C1 RLSSMJSEOOYNOY-UHFFFAOYSA-N 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 230000007017 scission Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- LMDZBCPBFSXMTL-UHFFFAOYSA-N 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide Chemical compound CCN=C=NCCCN(C)C LMDZBCPBFSXMTL-UHFFFAOYSA-N 0.000 description 1
- KZSNJWFQEVHDMF-SCSAIBSYSA-N D-valine Chemical class CC(C)[C@@H](N)C(O)=O KZSNJWFQEVHDMF-SCSAIBSYSA-N 0.000 description 1
- 229930182831 D-valine Natural products 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 229940121710 HMGCoA reductase inhibitor Drugs 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 150000008575 L-amino acids Chemical class 0.000 description 1
- MTCFGRXMJLQNBG-UHFFFAOYSA-N Serine Natural products OCC(N)C(O)=O MTCFGRXMJLQNBG-UHFFFAOYSA-N 0.000 description 1
- AYFVYJQAPQTCCC-UHFFFAOYSA-N Threonine Natural products CC(O)C(N)C(O)=O AYFVYJQAPQTCCC-UHFFFAOYSA-N 0.000 description 1
- KZSNJWFQEVHDMF-UHFFFAOYSA-N Valine Chemical compound CC(C)C(N)C(O)=O KZSNJWFQEVHDMF-UHFFFAOYSA-N 0.000 description 1
- 238000006640 acetylation reaction Methods 0.000 description 1
- 150000001370 alpha-amino acid derivatives Chemical class 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 description 1
- 125000001584 benzyloxycarbonyl group Chemical group C(=O)(OCC1=CC=CC=C1)* 0.000 description 1
- 150000001576 beta-amino acids Chemical class 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 125000001309 chloro group Chemical group Cl* 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000032050 esterification Effects 0.000 description 1
- OXZOLXJZTSUDOM-UHFFFAOYSA-N fluoro 2,2,2-trifluoroacetate Chemical compound FOC(=O)C(F)(F)F OXZOLXJZTSUDOM-UHFFFAOYSA-N 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- CMWYAOXYQATXSI-UHFFFAOYSA-N n,n-dimethylformamide;piperidine Chemical compound CN(C)C=O.C1CCNCC1 CMWYAOXYQATXSI-UHFFFAOYSA-N 0.000 description 1
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 description 1
- 125000006503 p-nitrobenzyl group Chemical group [H]C1=C([H])C(=C([H])C([H])=C1[N+]([O-])=O)C([H])([H])* 0.000 description 1
- UYWQUFXKFGHYNT-UHFFFAOYSA-N phenylmethyl ester of formic acid Natural products O=COCC1=CC=CC=C1 UYWQUFXKFGHYNT-UHFFFAOYSA-N 0.000 description 1
- 239000008363 phosphate buffer Substances 0.000 description 1
- BXRNXXXXHLBUKK-UHFFFAOYSA-N piperazine-2,5-dione Chemical compound O=C1CNC(=O)CN1 BXRNXXXXHLBUKK-UHFFFAOYSA-N 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 125000003607 serino group Chemical group [H]N([H])[C@]([H])(C(=O)[*])C(O[H])([H])[H] 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 238000010898 silica gel chromatography Methods 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical class O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- HNKJADCVZUBCPG-UHFFFAOYSA-N thioanisole Chemical compound CSC1=CC=CC=C1 HNKJADCVZUBCPG-UHFFFAOYSA-N 0.000 description 1
- 229960004295 valine Drugs 0.000 description 1
- 125000002987 valine group Chemical group [H]N([H])C([H])(C(*)=O)C([H])(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C271/00—Derivatives of carbamic acids, i.e. compounds containing any of the groups, the nitrogen atom not being part of nitro or nitroso groups
- C07C271/06—Esters of carbamic acids
- C07C271/08—Esters of carbamic acids having oxygen atoms of carbamate groups bound to acyclic carbon atoms
- C07C271/10—Esters of carbamic acids having oxygen atoms of carbamate groups bound to acyclic carbon atoms with the nitrogen atoms of the carbamate groups bound to hydrogen atoms or to acyclic carbon atoms
- C07C271/22—Esters of carbamic acids having oxygen atoms of carbamate groups bound to acyclic carbon atoms with the nitrogen atoms of the carbamate groups bound to hydrogen atoms or to acyclic carbon atoms to carbon atoms of hydrocarbon radicals substituted by carboxyl groups
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K7/00—Peptides having 5 to 20 amino acids in a fully defined sequence; Derivatives thereof
- C07K7/04—Linear peptides containing only normal peptide links
- C07K7/06—Linear peptides containing only normal peptide links having 5 to 11 amino acids
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/55—Design of synthesis routes, e.g. reducing the use of auxiliary or protecting groups
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Genetics & Genomics (AREA)
- Biochemistry (AREA)
- Biophysics (AREA)
- General Health & Medical Sciences (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Molecular Biology (AREA)
- Proteomics, Peptides & Aminoacids (AREA)
- Life Sciences & Earth Sciences (AREA)
- Peptides Or Proteins (AREA)
- Preparation Of Compounds By Using Micro-Organisms (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
Description
最近本発明者らは、difficult sequence含有ペプチドの効率的合成法として “O-アシルイソペプチド法”を開発した(非特許文献1,2参照)。この方法はセリン残基のような水酸基含有アミノ酸においてアミド結合をエステル結合に異性化したO-アシルイソペプチドを合成し、続いてO−N分子内アシル転位反応により目的のペプチドを得る方法である。
Tetrahedoron Letters 45 (2004) 5965-5968 Chem. Commun., 2004, 124-125
更には本発明の上記イソジペプチド(1)をペプチドの合成ユニットとして用いることにより、意外にも上記の様なラセミ化の副反応を防止しうることを見出し、目的のペプチドが高収率、高純度で得られることが判明した。
で表されるイソジペプチドに関する。
式(1)のXaおよびYaにおけるアルキル基としては、特に限定されないが、好ましくは炭素数1−6の直鎖または分枝鎖アルキル基が挙げられる。また、式(1)のXaにおけるアラルキル基、アリール基またはヘテロアリール基におけるアリールまたはヘテロアリール部はメチル、ニトロ、クロロなどの置換基を有していてもよい。
好ましいイソジペプチドとしては、式(1)において、nが0または1であるイソペプチド、式(1)において、Xaがカルボキシル基であり、Yaが水素原子、アルキル基であり、そしてnが0であるイソペプチドまたはその光学活性体、そして式(1)において、Xaが水素原子、アルキル基、アラルキル基、アリール基またはヘテロアリール基であり、Yaがカルボキシル基であり、そしてnが0であるイソペプチドまたはその光学活性体が、それぞれ挙げられる。
なお、Aで示されるN−保護アミノ酸の酸残基において、該アミノ酸が水酸基、更なるカルボキシル基等の側鎖官能基を有する場合は、それらを適当な公知の保護基で保護することが望ましい。
下記式(1a)
で表されるイソジペプチドである。この化合物(1a)はL-スレオニンまたはL-セリンを構成因子として含むポリペプチドを合成する方法において、特に利用価値が高い。
更には、下記式(1b)
で表される化合物である。
この化合物(1b)は、L-バリン-L-スレオニンまたはL-バリン−L-セリン 結合のジペプチドを構成因子とするペプチド合成に特に利用価値が高い。
なお、本発明に係るイソジペプチド(1)から誘導、あるいはそれを修飾した化合物であって、本発明の化合物と同じ機能を有する化合物も当然本発明の範囲に包含される。
即ち、A−OHで示されるN−保護アミノ酸と下記式(2)
で示される側鎖に水酸基を有するアミノ酸であって、そのカルボキシル基を保護した化合物(2a)とを反応させ、イソエステル体(2b)を得、ついで該カルボキシル基の保護基のみを脱離せしめることによりジイソペプチド(1)が製造される。
式(2)で示される化合物としては、具体的にはスレオニン、セリン、スタチン、ノルスタチン等の側鎖に水酸基を有するアミノ酸が好ましく挙げられる。
AOHで示されるN−保護アミノ酸としては、特に制限されず、アミノ基が保護されたαまたはβ−アミノ酸等の種々のタイプのアミノ酸が含まれる。
A−OHで示されるN−保護アミノ酸が側鎖官能基を有する場合、副反応を防止するために、その基を適当な公知の保護基で保護しておくことが望ましい。
化合物(2a)のカルボキシル基の保護基は、他のエステル部の開裂を防ぐ意味から、ベンジル基、p−ニトロベンジル基、4−ピリジルメチル基等の水素添加により脱離しうる基が好ましく挙げられる。更には、この点からイソジペプチド(1)の上記アミノ基の保護基も水素添加により脱離しない基が好ましく用いられる。
中間生成物である化合物(2b)のカルボキシル基の脱離処理は、例えばPd/Cの存在下、水素ガスを導入して実施できる。
かくして得られたイソジペプチド(1)は、常法により、単離、精製し、純品を得た後、所望のポリペプチド合成の合成ユニットとして使用される。
原料となるAOHで示される化合物および化合物(2)は、それぞれ1個またはそれ以上の不斉炭素を有する場合がある。従って、原料の種類によっては、目的物のイソペプチドは光学活性体、そのラセミ混合物、ジアステレオマー、その混合物の形で得られる。例えば、それぞれの光学活性な原料を用いることにより、ジアステレオマータイプのイソジペプチド((1b)や(1c)参照)が得られる。
また、ラセミ混合物あるいはジアステレオマー混合物の形で得られた場合、目的に応じて、常法に従い光学分割、分離作業を行い、光学純度の高い所望のイソジペプチドを得ることができる。
Reaction i: 20% ピペリジン/DMF 20分間
Reaction ii: Fmoc-Val-OH (2.5eq), 1,3−ジイソプロピルカルボジイミド(2.5eq), 1−ヒドロキシベンゾトリアゾール(2.5eq) DMF中 2時間
Reaction iii: Boc-Thr(Fmoc-Val)OH(2.5eq), 1,3-ジイソプロピルカルボ
ジイミド)(2.5eq), 1−ヒドロキシベンゾトリアゾール
(2.5eq) DMF中 2時間
Reaction iv: Ac2O(1.5eq), トリエチルアミン(1.0eq) DMF中 2時間
Reaction v: TFA-m-クレゾール-チオアニソール-H2O 1.5時間
Reaction vi: リン酸緩衝生理食塩水, pH 7.4(25℃)
以下実施例を挙げて、本発明を更に具体的に説明するが、本発明はこれら実施例により限定されるものではない。
HRMS (FAB): calcd. for C29H36N2O8Na (M+Na)+: 563.2369, found: 563.2373; HPLC analysis at 230 nm: 純度 95%以上; NMR (CD3OD, 400 MHz): δ 7.79 (d, 3J(H,H) = 7.3 Hz, 2 H, CH), 7.75-7.66 (m, 2H, CH), 7.38 (t, 3J(H,H) = 7.5 Hz, 2 H, CH), 7.33-7.29 (m, 2H, CH), 5.44-5.41 (m, 1H, CH), 4.38 (d, 3J(H,H) = 7.0 Hz, 2 H, CH2), 4.25-4.22 (m, 2 H, CH), 4.05-4.01 (m, 1 H, CH), 2.11-2.02 (m, 1 H, CH), 1.44 (s, 9 H, CH3), 1.25 (d, 3J(H,H) = 6.4 Hz, 3 H, CH3), 0.91, 0.89 (2d, 3J(H,H) = 7.7, 7.0 Hz, 6 H, CH3).
Rink Amide AM resin(100 mg, 0.071 mmol)を使用し、この樹脂をDMF(1.5 mL, ×5)で洗浄した後、配列に従ってFmoc-Val-OHを用いて通常の方法によりH-Val-Val-NH-resin を構築した。これに、実施例1で合成したBocThr(FmocVal)OH (100 mg, 0.18 mmol)をDMF(1.5 mL)中、1,3-ジイソプロピルカルボジイミド(29.0 μL, 0.18 mmol)および1−ヒドロキシベンゾトリアゾール(28.4 mg, 0.18 mmol)存在下で縮合した。その後、Fmoc-Val-OH(62.8 mg, 0.18 mmol)導入、Ac2O(10.5 μL, 0.11 mmol)-トリエチルアミン(10.4 μL,0.071 mmol) によりN-アセチル化を行った。保護ペプチド樹脂をチオアニソール(66.7 μL)、m-クレゾール(66.7 μL)およびH2O(66.7 μL)存在下TFA (2.47 mL)中で90分間撹拌し、反応液を濃縮、Et2Oによる洗浄、H2Oに懸濁、凍結乾燥し、下記構造のO-アシルイソペプチド(4a)
HRMS (FAB): calcd for C26H49N6O7 (M+H)+: 557.3663, found: 557.3666; HPLC analysis at 230 nm: 純度 95%以上.
上記O-アシルイソペプチド(4a) (3.0 mg)をpH 7.4の リン酸緩衝生理食塩液に溶解し (3 mL)、室温で一晩撹拌した。析出した白色沈殿物を濾過、H2OおよびMeOHで洗浄、真空ポンプで乾燥し、白色粉末のAc-Val-Val-Thr-Val-Val-NH2(3a)を得た(収量: 2.4 mg (96%))。
HRMS (FAB): calcd. for C26H49N6O7 (M+H)+: 557.3663, found: 557.3667; HPLC analysis at 230 nm: 純度 95%以上; 得られた化合物のHPLC (0100% CH3CN 40分間 230 nm) 上の保持時間は常法により合成したペプチド(3a)のそれと一致した。
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