Click a la carte: robust semi-orthogonal alkyne protecting groups for multiple successive azide/alkyne cycloadditions
Click a la carte: robust semi-orthogonal alkyne protecting groups for multiple successive azide/alkyne cycloadditions
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DOI:
10.1016/j.tet.2009.06.093
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发表时间:
2009-09-05
期刊:
影响因子:
2.1
通讯作者:
Aucagne, Vincent
中科院分区:
文献类型:
--
作者:
Valverde, Ibai E.;Delmas, Agnes F.;Aucagne, Vincent
We herein describe an in-depth screening and systematic comparison of five classical silyl alkyne protective groups, to evaluate their potential in the context of multiple successive copper (I)-catalyzed alkyne-azide cycloadditions (CuAAC). We confirm the relative sensitivity of TMS, especially under CuAAC conditions. The relative robustness of its higher analogues, and the discovery of mild silver-catalyzed deprotection conditions selective for TES compared to DPS or TIPS allowed us to design a strategy allowing three successive CuAAC on a single scaffold, as we have illustrated by the synthesis of a tris-triazolo model compound. (C) 2009 Elsevier Ltd. All rights reserved.