Full Stereochemical Determination of Ajudazols A and B by Bioinformatics Gene Cluster Analysis and Total Synthesis of Ajudazol B by an Asymmetric Ortholithiation Strategy
chain inhibitors ajudazols A and B and the totalsynthesis of ajudazol B are reported. Configurational assignment was exclusively based on biosynthetic gene cluster analysis of both ketoreductase domains for hydroxyl-bearing stereocenters and one of the first predictive enoylreductase alignments for methyl-bearing stereocenters. The expedient totalsynthesis resulting in unambiguous proof of the predicted
报告了强效呼吸链抑制剂阿达唑 A 和 B 的立体化学测定以及阿达唑 B 的全合成。构型分配完全基于对含羟基立体中心的酮还原酶结构域和含甲基立体中心的第一个预测性烯酰还原酶比对之一的生物合成基因簇分析。通过创新的不对称正锂化策略、模块化恶唑形成和后期 Z,Z 选择性 Suzuki 偶联,对具有挑战性的异色满酮立体三联体进行了短期立体选择性方法,从而对预测的立体化学进行了明确的证明。
Studies on Selective Metalation and Cross-Coupling Reactions of Oxazoles
作者:Dirk Menche、Raphael Wagner、Philipp Wollnitzke、Sebastian Essig、Jan P. Gölz
DOI:10.1055/a-2126-0720
日期:2023.12
that was based on the different pK a values of these positions, while a halide at C4 may be introduced by an optimized halogen dance reaction. Efficient protocols for subsequent sp2–sp2 and sp2–sp3 cross-coupling reactions of the derived oxazolyl halides were then established. This modular approach was applied in the total synthesis of ajudazol A and a selected analogue, demonstrating the general feasibility
Total Synthesis of Ajudazol A by a Modular Oxazole Diversification Strategy
作者:Philipp Wollnitzke、Sebastian Essig、Jan Philipp Gölz、Karin von Schwarzenberg、Dirk Menche
DOI:10.1021/acs.orglett.0c02188
日期:2020.8.21
The totalsynthesis of the potent respiratory chain inhibitor ajudazol A was accomplished by a concise strategy in 17 steps (longest linear sequence). The modularapproach was based on a direct oxazole functionalization strategy involving a halogen dance reaction for selective halogenation in combination with a challenging combination of sp2–sp2 and sp2–sp3 Negishi cross coupling reactions. The applicability