Greener Cleavage of Protected Peptide Fragments from Sieber Amide Resin.

Greener Cleavage of Protected Peptide Fragments from Sieber Amide Resin.
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DOI:
10.1002/open.202200236
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发表时间:
2022-12
期刊:
影响因子:
2.3
通讯作者:
Williams, Daryl R.
Williams, Daryl R.
中科院分区:
化学3区
文献类型:
--
作者:
Al Musaimi, Othman;Gavva, Varshitha;Williams, Daryl R.

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在成功引入用于从2-氯三苯甲基氯(2-CTC)树脂切割受保护的酸性肽片段的两种良性溶剂之后,需要绿色切割过程以获得受保护的肽酰胺片段。在这项工作中,引入对二甲苯和甲苯作为二氯甲烷(DCM)的更环保的替代物,用于从Sieber酰胺树脂制备受保护的肽酰胺片段。N-脱烷基化是一种要求苛刻的化学反应,需要优化裂解方案以确保从树脂上完全裂解。在30分钟反应时间后,即使使用常规二氯甲烷溶剂,也仅回收66%的最终肽产物。 因此,认为120分钟足以从Sieber酰胺树脂上完全切割肽。 这项工作重申了这样一个事实,即绿化战略远非有害,绿色替代品的表现往往优于其被取代的同行。 对二甲苯和甲苯被证明是DCM的更绿色的替代品,用于从Sieber酰胺树脂制备受保护的肽酰胺,用于随后的关键反应,如环化和片段缩合。甲苯可以被认为是从2-氯三苯甲基氯(2-CTC)和Sieber酰胺树脂裂解肽的通用溶剂。它的使用使回收任务更容易,并有助于实施循环经济闭环方法。
Following the successful introduction of two benign solvents for cleaving protected acid peptide fragments from 2‐chlorotrityl chloride (2‐CTC) resin, there is a need to green the cleavage process for obtaining protected peptide amide fragments. In this work, p‐xylene and toluene are introduced as greener alternates to dichloromethane (DCM) for preparing protected peptide amide fragments from a Sieber amide resin. The N‐dealkylation is a demanding chemical reaction, requiring that the cleavage protocol be optimised to ensure complete cleavage from the resin. After a 30 min reaction time, only 66 % of the final peptide product was retrieved even with the conventional dichloromethane solvent. Therefore, 120 min was considered sufficient to fully cleave the peptide from the Sieber amide resin. This work reaffirms the fact that greening strategies are far from detrimental, with green alternatives often outperforming their replaced counterparts. p ‐Xylene and toluene are shown to be greener alternatives to DCM for preparing protected peptide amides from Sieber amide resin for subsequent key reactions such as cyclisation and fragment condensation. Toluene can be considered a universal solvent for cleaving peptides from both 2‐chlorotrityl chloride (2‐CTC) and Sieber amide resins. Its use makes the recycling task easier and helps in implementing a circular economy closed‐loop approach.
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发表时间: 2022-02-13
期刊: Pharmaceuticals (Basel, Switzerland)
影响因子: --
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