A combinatorial approach towards the synthesis of non-hydrolysable triazole–iduronic acid hybrid inhibitors of human α-<scp>l</scp>-iduronidase: discovery of enzyme stabilizers for the potential treatment of MPSI
Preparation of substituent-diverse, triazole–iduronic acid hybrid molecules by click reaction of an azido iduronic acid derivative with randomly chosen alkynes is described. Library members were screened for their ability to inhibit α-L-iduronidase, and hit molecules and analogues were then investigated for their ability to stabilize rh-α-IDUA in a thermal denaturation study. This work resulted in
3-Silaazetidine: An Unexplored yet Versatile Organosilane Species for Ring Expansion toward Silaazacycles
作者:Wanshu Wang、Song Zhou、Linjie Li、Yuanhang He、Xue Dong、Lu Gao、Qiantao Wang、Zhenlei Song
DOI:10.1021/jacs.1c04667
日期:2021.7.28
Small-ring silacycles are important organosilane species in main-group chemistry and have found numerous applications in organic synthesis. 3-Silaazetidine, a unique small silacycle bearing silicon and nitrogen atoms, has not been adequately explored due to the lack of a general synthetic scheme and its sensitivity to air. Here, we describe that 3-silaazetidine can be easily prepared in situ from diverse
When attempting to extend the Zn(OTf)2-catalyzed hydrazination of propargylic amides (en route to Fischer indoles) to alkanoic propargylamides, it was discovered that after the initial hydrazination event, the respective N-anilinoimidazoles are obtained. The use of stoichiometric ZnCl2 as the promoter still gave the Fischer indole product. The unexpected reaction outcome was attributed to the overly
base-promoted, allene-mediated cyclization of the alkynemoiety onto the nearby aromatic ring, substantial amount of the ketone resulting from hydration of the alkyne with adventitious water was discovered. The formation of the ketone of the anti-Markovnikov alkyne hydration was developed into a preparative method. This method, alternative to the common acid-and metal-catalyzed approaches, may be of particular
A bimetallic tandem catalysis-enabled enantioselective cycloisomerization/carbonyl–enereaction was developed. The reaction proceeded well with a broad range of N-propargylamides and acylsilanes, affording the target chiral 5-oxazoylmethyl α-silyl alcohols in up to 95% yield and 99% ee under mild conditions. Importantly, this facile protocol was available for the late-stage modification of several
开发了一种双金属串联催化的对映选择性环异构化/羰基-烯反应。该反应与多种N-炔丙基酰胺和酰基硅烷一起顺利进行,在温和条件下以高达 95% 的产率和 99% ee 得到目标手性 5-恶唑酰基甲基 α-硅醇。重要的是,这种简便的方案可用于几种生物活性分子的后期修饰。基于机理研究和控制实验,提出了可能的催化循环和过渡态来阐明反应过程和对映诱导。