Convenient green preparation of dipeptides using unprotected α-amino acids
摘要:
Dipeptides and amides were obtained in high yields from N-carbobenzyloxy a-amino acids and 3-phenylpropanoic acid with unprotected a-amino acids via the corresponding mixed carbonic carboxylic anhydrides using ethyl chloroformate and triethylamine by an ecological and convenient method in which the protection of C-terminals is not needed. (C) 2016 Elsevier Ltd. All rights reserved.
peptide synthesis (SPPS). The robustness of the allenone-mediated peptide bond formation was showcased incisively by the synthesis of carfilzomib, which involved a rare racemization-/epimerization-free N to C peptide elongation strategy. Furthermore, the successful synthesis of the model difficult peptide ACP (65–74) on a solid support suggested that this method was compatible with SPPS. This method combines
Allenone 首次被鉴定为一种高效的肽偶联剂。肽键以α-羰基乙烯基酯为关键中间体形成,其形成和随后的氨解以无外消旋/差向异构化的方式自发进行。丙二烯酮偶联试剂不仅对简单酰胺和二肽的合成有效,而且还适用于肽片段缩合和固相肽合成 (SPPS)。卡非佐米的合成充分展示了丙二烯酮介导的肽键形成的稳健性,该合成涉及一种罕见的无消旋化/差向异构化的 N 到 C 肽延伸策略。此外,在固体支持物上成功合成模型困难肽 ACP (65-74) 表明该方法与 SPPS 兼容。该方法结合了传统活性酯和偶联剂的优点,同时克服了两种策略的缺点。因此,这种丙二烯酮介导的肽键形成策略代表了肽合成的颠覆性创新。
Water-removable ynamide coupling reagent for racemization-free syntheses of peptides, amides, and esters
作者:Tao Liu、Xue Zhang、Zejun Peng、Junfeng Zhao
DOI:10.1039/d1gc03498g
日期:——
A novel ynamide coupling reagent, the by-product of which can be removed by water, was reported. It promotes the direct coupling between carboxylic acids and amines, alcohols or thiols to provide amides, peptides, esters and thioesters, respectively. No detectable racemization was observed for all the coupling reactions of carboxylic acids containing an α-chiral center. Importantly, a simple acidic
Synthesis of new 7‐amino‐3,4‐dihydroquinolin‐2(1
<i>H</i>
)‐one‐peptide derivatives and their carbonic anhydrase enzyme inhibition, antioxidant, and cytotoxic activities
elemental analysis methods. The human carbonicanhydrase (hCA) I and hCA II enzyme inhibitionactivities of the compounds were determined using the stopped-flow instrument. The synthesized peptide–dihydroquinolinone conjugates 2, 3, 6, 10, 13, and 15 showed inhibition against the hCA II enzyme in the range of 15.7–65.7 µM. However, none of the compounds showed inhibition of hCA I at a concentration of 100 µM
采用苯并噻唑介导的方法制备了六种新的单肽、七种新的二肽和两种去保护的单肽二氢喹啉酮偶联物,并通过核磁共振、质谱、红外光谱和元素分析方法确认了它们的结构。使用停流仪器测定化合物的人碳酸酐酶 (hCA) I 和 hCA II 酶抑制活性。合成的肽-二氢喹啉酮结合物2、3、6、10、13和15显示对 hCA II 酶的抑制作用在 15.7–65.7 µM 范围内。然而,没有一种化合物在浓度为 100 µM 时显示出对 hCA I 的抑制作用。还使用浓度为 12.5–125 µg/ml 的 DPPH(2,2-二苯基-1-苦基肼)自由基清除方法检查了化合物的抗氧化活性,但与标准抗氧化剂化合物 α-生育酚和丁基羟基茴香醚相比(BHA),检测到较弱的抗氧化活性。还研究了四种化合物对 A549 和 BEAS-2B 细胞系的细胞毒性作用。在所研究的化合物中,发现化合物7最有效,其对 A549 细胞 48 和
Pyrrolydin-2-one derivatives as inhibitors of thrombin and factor xa
申请人:Borthwick David Alan
公开号:US20060166985A1
公开(公告)日:2006-07-27
The invention relates to novel chemical compounds, pharmaceutically acceptable derivatives thereof, processes for their preparation, pharmaceutical compositions containing them, and to their use in medicine, particularly use in the amelioration of a clinical condition for which a thrombin inhibitor is indicated.
overcoming their disadvantages, and exhibit superiority in addressing the notorious racemization/epimerization issue. The applicability of ynamide coupling reagents has been successfully expanded to peptide fragment condensation, head-to-tail cyclization, and solid-phase peptide synthesis on the basis of a systematic mechanisticstudy.