A Synthetic Approach to Diverse 3-Acyltetramic Acids via <i>O</i>- to <i>C</i>-Acyl Rearrangement and Application to the Total Synthesis of Penicillenol Series
作者:Tetsuya Sengoku、Yuta Nagae、Yasuaki Ujihara、Masaki Takahashi、Hidemi Yoda
DOI:10.1021/jo300527f
日期:2012.5.4
efficient approach to medicinally important α-branched 3-acyltetramic acids, the key reaction of O- to C- acyl rearrangement using α-amino-acid-derived 4-O-acyltetramic acids was extensively examined in the presence of various metal salts. Use of CaCl2 or NaI dramatically changed the results in the reaction efficiency and rapidly brought about the desired α-branched 3-acyltetramic acids in markedly
为了有效地利用具有重要医学意义的α-支链3-酰基四酸,在各种金属盐存在下,广泛研究了使用α-氨基酸衍生的4- O-酰基四酸对O-进行C酰基重排的关键反应。。CaCl 2或NaI的使用显着改变了反应效率的结果,并以显着提高的产率迅速产生了所需的α-支化的3-酰基四酸。我们还讨论了重排条件下C5立体中心的差向异构化以及C3和C5的结构变异耐受性。除了先前在成功合成新的细胞毒性四酸青霉素A 1方面的成功之外,,这种方法也可以应用于青霉素A 2的第一次全合成。