1-乙氧基亚乙基，逐步制备含肽的氨基氧乙酸的SPPS的新基团,The Journal of Organic Chemistry

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1-乙氧基亚乙基，逐步制备含肽的氨基氧乙酸的SPPS的新基团
The Journal of Organic Chemistry ( IF 3.3 ) Pub Date : 2008-01-04 00:00:00 , DOI: 10.1021/jo701628k
Stéphanie Foillard ₁ , Martin Ohsten Rasmussen ₁ , Jesus Razkin ₁ , Didier Boturyn ₁ , Pascal Dumy ₁

Affiliation

十多年来，肟醚连接已被证明是制备各种肽结合物的最有效技术之一。然而，尽管有许多报道，但是含氨氧基的肽的制备仍在其掺入过程中或通过肽链延长而受到NH-O功能的N-过度酰化的阻碍。这限制了在最后的酰化步骤引入受保护的NH-O功能，并阻止了使用标准固相肽合成（SPPS）程序来制备更复杂的氨氧基肽。我们已经研究了包含N -Boc-或N，N的修饰Fmoc-赖氨酸的偶联'-双-Boc保护的氨氧基乙酸（Aoa）在肽链的延长过程中，发现没有一个是足够的。为了规避此限制，我们建议使用1-乙氧基亚乙基（Eei）保护Aoa部分，以提供2-（1-乙氧基亚乙基氨基氧基）乙酸构件。我们表明，Eei基团与标准SPPS条件完全兼容，并且可以安全地将氨氧基官能团多次掺入正在生长的肽中。由于Eei保护的Aoa在肽合成中仍保持与正常氨基酸一样的柔韧性，因此可能成为直接制备氨氧基肽的规则。

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1-Ethoxyethylidene, a New Group for the Stepwise SPPS of Aminooxyacetic Acid Containing Peptides

For more than a decade, the oxime ether ligation has proven to be one of the most efficient technique for the preparation of various peptide conjugates. However, despite numerous reports, the preparation of aminooxy-containing peptides is still hampered by N-overacylation of the NH−O function either during its incorporation or through the peptide-chain elongation. This restricts the introduction of protected-NH−O function at the last acylation step and prevents the use of standard solid-phase peptide synthesis (SPPS) procedures for the preparation of more complex aminooxy-peptides. We have studied the coupling of modified Fmoc-lysine containing either N-Boc- or N,N‘-bis-Boc-protected aminooxyacetic acids (Aoa) during the elongation of the peptide chain and found that none of them is adequate. To circumvent this limitation, we propose to protect the Aoa moiety with a 1-ethoxyethylidene group (Eei) to provide 2-(1-ethoxyethylideneaminooxy)acetic acid building block. We showed that the Eei group is fully compatible with standard SPPS conditions and safely allows the multiple incorporation of the aminooxy functionality into the growing peptide. Since Eei-protected Aoa remains as flexible as normal amino acids in peptide synthesis, it may become the rule for the straightforward preparation of aminooxy peptides.

更新日期：2008-01-04

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