CN101245094B - 肽醛的一种液相合成法 - Google Patents

肽醛的一种液相合成法 Download PDF

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CN101245094B
CN101245094B CN2007100375549A CN200710037554A CN101245094B CN 101245094 B CN101245094 B CN 101245094B CN 2007100375549 A CN2007100375549 A CN 2007100375549A CN 200710037554 A CN200710037554 A CN 200710037554A CN 101245094 B CN101245094 B CN 101245094B
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phenylalanine
ice bath
benzyl ester
organic solvent
carbobenzoxy
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CN101245094A (zh
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徐红岩
刘洪英
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GL BIOCHEM (SHANGHAI) Ltd
Shanghai Institute of Organic Chemistry of CAS
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GL BIOCHEM (SHANGHAI) Ltd
Shanghai Institute of Organic Chemistry of CAS
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Abstract

本发明涉及肽醛的一种合成方法。解决目前采用固相合成法成本较高,液相合成法产率较低的技术问题。主要合成步骤:a.以保护氨基酸为原料在有机溶剂中合成C-端以硫苄酯为保护基的肽链;b.在肽硫苄酯的有机溶剂中加入10%Pd-C、Et3SiH,在20~35℃反应6~8小时后得到肽醛;本发明主要用于合成活性肽醛。

Description

肽醛的一种液相合成法
技术领域:
本发明涉及肽醛的合成方法,特别涉及肽醛的一种液相合成法。
背景技术:
肽醛是许多与人类疾病相关重要酶的抑制剂,如对凝血酶,HIV蛋白水解酶等的抑制作用,在治疗高血压,心肌梗塞,老年痴呆症,关节炎,肿瘤等方面起重要作用(Ref1:Chem.Rev.,1997,97,133.Ref2:Chem.Rev.,1997,97,1359.Ref3:Biopolymers,2000,55,165)。肽醛也是有机合成中重要的中间体,在多肽衍生物合成中被广泛应用(Ref1:J.Am.Chem.Soc.,1981,103,6251.Ref2:J.Am.Chem.Soc.,1989,111,3368)。在以往报道各种肽醛的固相合成方法成本较高,不利于肽醛合成的推广。
发明内容:
本发明的目的是提供一种合成肽醛的方法,解决目前采用固相合成法成本较高,液相合成法复杂的技术问题。本发明的技术方案为:肽醛的一种液相合成法,包括以下步骤:
a.以保护氨基酸为原料在有机溶剂中合成C-端以硫苄酯为保护基的肽链;
b.在上述产物的有机溶剂中加入10%Pd-C和Et3SiH,在20~35℃反应6~8小时后得到肽醛。有机溶剂为丙酮或四氢呋喃。
步骤a中有机溶剂为二氯甲烷、N,N-二甲基甲酰胺和N,N-二甲基乙酰胺中的一种。步骤b中有机溶剂为四氢呋喃和丙酮中的一种。
以Z-Val-Phe-H为例包括如下步骤:
1.Boc-Phe-OH溶解到适量的有机溶剂中,加入HOBt、NMM或Et3N或DIEA和苄硫醇,冰浴下搅拌5~15min,加入DCC,20~30min后撤掉冰浴,室温搅拌过夜。合成的Boc-Phe-SBzl经2mol/L二氧六环盐酸气脱保护得到H-Phe-SBzl。有机溶剂为四氢呋喃或N,N-二甲基甲酰胺或N,N-二甲基乙酰胺溶剂中的一种。
2.Z-Val-OH和H-Phe-SBzl溶解到适量的有机溶剂中,加入HOBt和NMM或Et3N,冰浴下搅拌5~15min,加入DCC,20~30min后撤掉冰浴,室温搅拌过夜,得到Z-Val-Phe-SBzl。有机溶剂为四氢呋喃或N,N-二甲基甲酰胺或N,N-二甲基乙酰胺溶剂中的一种。
3.Z-Val-Phe-SBzl经10%Pd-C,Et3SiH在20~35℃反应6小时还原得到Z-Val-Phe-H。溶剂为丙酮或四氢呋喃。
本发明中一些常用的缩写具有以下含义:
Boc:叔丁氧羰基
DMF:N,N-二甲基甲酰胺
HOBt:1-羟基苯并三唑
NMM:N-甲基吗啡啉
DCC:二环己基碳二亚胺
DIEA:二异丙基乙胺
Boc-Phe-OH:N-叔丁氧羰基-苯丙氨酸
Boc-Phe-SBzl:N-叔丁氧羰基-苯丙氨酸硫苄酯
H-Phe-SBzl:苯丙氨酸硫苄酯
AC-Leu-OH:N-乙酰-亮氨酸
H-Leu-OMe·HCl:亮氨酸甲酯盐酸盐
Z-Val-OH:N-苄氧羰基-缬氨酸
Z-Val-Phe-SBzl:N-苄氧羰基-缬氨酰-苯丙氨酸硫苄酯
Et3N:三乙胺
Et3SiH:三乙基硅烷
Z-Val-Phe-H:N-苄氧羰基-缬氨酰-苯丙氨基醛
合成路线如下:
Figure G07137554920070315D000021
本发明的有益效果是:该方法合成肽醛的原料简单易得,经过常用的还原方法就可以得到肽醛,且不影响各基团的保护基,产率较高,成本低,便于大规模生产。
具体实施方式:
参照实例对本发明作进一步的详细描述,但不限于这些具体实例。
实施例1,参照合成路线,Boc-Phe-OH 2.65g(10mmol)溶解DMF溶剂中,加入HOBt 1.35g(10mmol)、DIEA 4.3mL(25mmol),冰浴下搅拌10min,加入DCC2.27g(11mmol),30min后撤掉冰浴,室温搅拌过夜。合成的Boc-Phe-SBzl经2mol/L二氧六环盐酸气脱保护得到HCl·H-Phe-SBzl 2.2g。Z-Val-OH 1.63g(6.5mmol)和H-Phe-SBzl·HCl 2.16g(7mmol)溶解到适量的DMF溶液中,加入HOBt1.08g(8mmol)和NMM 2.2mL(20mmol),冰浴下搅拌10min,加入DCC2.06g(10mmol),30min后撤掉冰浴,室温搅拌过夜,得到Z-Val-Phe-SBzl 2.8g。Z-Val-Phe-SBzl 1.00g(2mmol)溶解在60mL丙酮中,热水浴保持20~35℃,抽真空后反应液用氮气或氩气保护,加10%Pd-C 0.19g,Et3SiH 1.01g(10mmol)还原得到Z-Val-Phe-H 0.3g,反应时间为6小时。
实施例2,第一次冰浴搅拌时间为5min,加入DCC后20min撤掉冰浴,第二次冰浴搅拌时间为5min,加入DCC后20min撤掉冰浴,最后还原反应时间为7小时,其余与实施例1相同。
实施例3,第一次冰浴搅拌时间为15min,加入DCC后25min撤掉冰浴,第二次冰浴搅拌时间为15min,加入DCC后25min撤掉冰浴,最后还原反应时间为8小时,其余与实施例1相同。
实施例4,AC-Leu-OH 1.73g(10mmol),H-Leu-OMe·HCl 2.00g(11mmol)溶解在DMF溶剂中,加入HOBt 1.35g(10mmol)、NMM 2.8mL(25mmol),冰浴下搅拌10min,加入DCC 2.27g(11mmol),30min后撤掉冰浴,室温搅拌过夜。合成的AC-Leu-Leu-OMe溶解在四氢呋喃或甲醇或二者混合液中,加LiOH饱和水溶液保持PH值为11,得到AC-Leu-Leu-OH 2.3g。AC-Leu-Leu-OH 2.29g(8mmol)和H-Ala-SBzl·HCl 2.04g(8.8mmol)溶解到适量的DMF溶液中,加入HOBt1.08g(8mmol)和NMM 2.2mL(20mmol),冰浴下搅拌10min,加入DCC1.82g(8.8mmol),30min后撤掉冰浴,室温搅拌过夜,得到AC-Leu-Leu-Ala-SBzl3.2g。AC-Leu-Leu-Ala-SBzl 1.75g(3.8mmol)溶解在100mL丙酮中,热水浴保持20~35℃,抽真空后反应液用氮气或氩气保护,加10%Pd-C 0.33g,Et3SiH 1.93g(19mmol)反应7h得到AC-Leu-Leu-Ala-H0.5g。

Claims (1)

1.肽醛的一种液相合成法,其特征是包括如下步骤:
a、以N-叔丁氧羰基-苯丙氨酸为原料溶解到有机溶剂四氢呋喃或N,N-二甲基甲酰胺或N,N-二甲基乙酰胺溶剂中的一种中,加入1-羟基苯并三唑、N-甲基吗啡啉、三乙胺、二异丙基乙胺和苄硫醇,冰浴下搅拌5~15min,加入二环己基碳二亚胺,20~30min后撤掉冰浴,室温搅拌过夜;合成的N-叔丁氧羰基-苯丙氨酸硫苄酯经2mol/L二氧六环盐酸气脱保护得到苯丙氨酸硫苄酯;
b、将N-苄氧羰基-缬氨酸和苯丙氨酸硫苄酯溶解到有机溶剂四氢呋喃、N,N-二甲基甲酰胺或N,N-二甲基乙酰胺溶剂中的一种中,加入1-羟基苯并三唑、N-甲基吗啡啉和三乙胺,冰浴下搅拌5~15min,加入二环己基碳二亚胺,20~30min后撤掉冰浴,室温搅拌过夜,得到N-苄氧羰基-缬氨酰-苯丙氨酸硫苄酯;
c、N-苄氧羰基-缬氨酰-苯丙氨酸硫苄酯在有机溶剂丙酮或四氢呋喃中经10%钯碳和三乙基硅烷在20~35℃反应6~8小时还原得到N-苄氧羰基-缬氨酰-苯丙氨基醛。
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WO2000024704A1 (fr) * 1998-10-23 2000-05-04 Senju Pharmaceutical Co., Ltd. Procede de fabrication d'aldehydes de peptidyle

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WO2000024704A1 (fr) * 1998-10-23 2000-05-04 Senju Pharmaceutical Co., Ltd. Procede de fabrication d'aldehydes de peptidyle

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