作者:Judith Hoffmann、Uli Kazmaier
DOI:10.1002/anie.201405650
日期:2014.10.13
synthesis of cyclic photoactivatable natural products. Cyclization occurs between the allyl moiety in the protecting group and a second double bond in the target molecule by means of ring‐closing metathesis. Cyclization should increase the metabolic stability towards proteases. On the other hand, the conformational change should cause diminished biological activity. As illustrated for tubulysin derivatives
含有另外的烯丙基官能团的新的对光不稳定的保护基的开发允许合成可光活化的环状天然产物。通过闭环复分解,保护基中的烯丙基部分与靶分子中的第二个双键之间发生环化。环化应增加对蛋白酶的代谢稳定性。另一方面,构象变化应导致生物活性降低。如针对微管蛋白溶素衍生物所示,从Ugi反应和闭环易位的简单构造单元中,只需两个步骤即可轻松获得环状和可光活化的候选药物。在Ugi反应过程中,通过异氰酸酯组分引入光不稳定的保护基。