The first total synthesis of (-)-maoecrystal Z is described. The key steps of the synthesis include a diastereoselective Ti(III)-mediated reductive epoxide coupling reaction and a diastereoselective Sm(II)-mediated reductive cascade cydization reaction. These transformations enabled the preparation of (-)-maoecrystal Z in only 12 steps from (-)-gamma-cyclogeraniol.
The first total synthesis of (-)-maoecrystal Z is described. The key steps of the synthesis include a diastereoselective Ti(III)-mediated reductive epoxide coupling reaction and a diastereoselective Sm(II)-mediated reductive cascade cydization reaction. These transformations enabled the preparation of (-)-maoecrystal Z in only 12 steps from (-)-gamma-cyclogeraniol.
Dibromomethane as one-carbon source in organic synthesis: total synthesis of (±)- and (−)-methylenolactocin
作者:Yung-Son Hon、Cheng-Han Hsieh、Yu-Wei Liu
DOI:10.1016/j.tet.2005.01.057
日期:2005.3
introduce the α-methylene group by the ozonolysis of mono-substituted alkenes followed by reacting with a preheated mixture of CH2Br2–Et2NH. Application of this key step in the total synthesis of the (±)- and (−)-methylenolactocin was described.
Diastereoselective Aza‐Mislow–Evans Rearrangement of
<i>N</i>
‐Acyl
<i>tert</i>
‐Butanesulfinamides into α‐Sulfenyloxy Carboxamides
作者:Fan Tang、Yun Yao、Yan‐Jun Xu、Chong‐Dao Lu
DOI:10.1002/anie.201809551
日期:2018.11.19
diastereoselective [2,3] rearrangement of O‐silyl N‐sulfinyl N,O‐ketene acetals derived from chiral N‐acyl tert‐butanesulfinamides was developed, giving α‐sulfenyloxy carboxamides with excellent enantioselectivity. Enolization and subsequent silylation of N‐acyl tert‐butanesulfinamides initiate this aza variant of the Mislow–Evans rearrangement, in which the chirality at the sulfur atom in the rearrangement precursors
Target-Based Design of Promysalin Analogues Identifies a New Putative Binding Cleft in Succinate Dehydrogenase
作者:Savannah J. Post、Colleen E. Keohane、Lauren M. Rossiter、Anna R. Kaplan、Jittasak Khowsathit、Katie Matuska、John Karanicolas、William M. Wuest
DOI:10.1021/acsinfecdis.0c00024
日期:2020.6.12
synthesis; subsequent analogue design and SAR investigation enabled identification of succinate dehydrogenase (Sdh) as the biological target in PA. Herein, we report the target-guided design of new promysalin analogues with varying alkyl chains, one of which is on par with our most potent analogue to date. Computational docking revealed that some analogues have a different orientation in the Sdh binding
PromySAlin 是一种小分子天然产物,可特异性抑制革兰氏阴性病原体铜绿假单胞菌( PA ) 的生长。这项活动有望治疗患有慢性疾病(如囊性纤维化)的免疫功能低下患者的多重耐药感染。 2015年,我们实验室完成了首次全合成;随后的类似物设计和 SAR 研究使琥珀酸脱氢酶 (Sdh) 确定为PA的生物靶标。在此,我们报告了具有不同烷基链的新型原米沙林类似物的靶向设计,其中一种与我们迄今为止最有效的类似物相当。计算对接表明,一些类似物在 Sdh 结合袋中具有不同的方向,将末端碳置于色氨酸残基附近。这启发了带有末端苯基部分的延伸侧链类似物的设计,为未来类似物的设计提供了基础。
Synthesis of enantiomerically pure divinyl- and diallylcarbinols
作者:Bernd Schmidt、Holger Wildemann
DOI:10.1039/b200976e
日期:2002.4.9
Acylated oxazolidinones and bornane sultams can be cleaved to divinyl- and diallylcarbinols by treatment with vinyl- or allylmetal compounds. For the preparation of divinylcarbinols, acylated bornane sultams are the starting materials of choice, while for the preparation of diallylcarbinols acylated oxazolidinones and bornane sultams work equally well.
Tandem Organocatalytic Cycloaromatization/Intramolecular Friedel–Crafts Alkylation Sequence for the Synthesis of Indolizinones and Pyrrolo-azepinone Derivatives
作者:Fernando Rabasa-Alcañiz、María Sánchez-Roselló、Santos Fustero、Carlos del Pozo
DOI:10.1021/acs.joc.9b01314
日期:2019.9.6
The organocatalytic synthesis of indolizinones and pyrrolo-azepinones has been accomplished in a tandem fashion through a sequence that comprises initial cycloaromatization followed by intramolecular Friedel–Crafts alkylation. The process takes place under Brønsted acid catalysis, giving rise to final products in moderate to good yields. Attempts to carry out the tandem protocol in an enantioselective