Total Synthesis of Leupyrrins A<sub>1</sub>and B<sub>1</sub>, Highly Potent Antifungal Agents from the Myxobacterium<i>Sorangium cellulosum</i>
作者:Sebastian Thiede、Paul R. Wosniok、Daniel Herkommer、Thomas Debnar、Maoqun Tian、Tongtong Wang、Michael Schrempp、Dirk Menche
DOI:10.1002/chem.201604445
日期:2017.3.8
involving a one‐pot lactol opening, stereoselective aldehyde addition and in situ lactonization. Furthermore, an innovative sp2‐sp3‐cross‐coupling for pyrrole functionalization and an optimized HATU‐mediated amide coupling protocol of two elaborate fragments were established. In addition, an unusual protective group strategy, involving a Teoc‐acetonide protected amine in combination with tert‐butyl
Synthesis of α‐Chiral Butyrolactones by Highly Stereoselective Radical Transfer or Sequential Asymmetric Alkylations: Concise Preparation of Leupyrrin Moieties
and B1, two novel stereoselective methods for the highly concise synthesis of densely substituted α‐chiral butyrolactones are reported. The first approach relies on an innovative three‐step TiIII‐catalyzed radical reaction that proceeds with excellent chemo‐, regio‐, and stereoselectivity. The alternative route utilizes sequential asymmetric alkylations and enables asymmetric synthesis of the authentic
Structure–activity relationships of tulipalines, tuliposides, and related compounds as inhibitors of MurA
作者:Thomas Mendgen、Therese Scholz、Christian D. Klein
DOI:10.1016/j.bmcl.2010.07.139
日期:2010.10
antibacterial compounds. We report here the inhibition of MurA by natural products from tulips (tulipalines and tuliposides), and the structure–activityrelationships of various derivatives. The inhibition of MurA can be related to antibacterial activity, and MurA is probably one of the relevant molecular targets of the tulipaline derivatives. MurA inhibition by this class of compounds depends on the