许多天然和药物产品中都存在手性β-内酰胺和环丁酮。手性四元环化合物的立体选择性结构是化学界面临的挑战。本文中,我们报告了通过Ir / In-BiphPHOX催化的不对称加氢对四元环(微型)β-内酰胺和环丁酮进行高度立体控制的结构,从而提供了相应的旋光四元环羰基产物,这些产物带有α-手性碳中心,在温和的反应条件下(1.0-2.5 bar H 2)具有出色的收率(高达99%)和对映选择性(高达98%)持续1.0-10小时)。该反应代表了广泛的底物范围。还进行了催化产物的多种转化,以显示该方案的潜在效用。
Synthesis of isothiosemicarbazones of potential antitumoral activity through a multicomponent reaction involving allylic bromides, carbonyl compounds and thiosemicarbazide
作者:Laiéli S. Munaretto、Misael Ferreira、Daniela P. Gouvêa、Adailton J. Bortoluzzi、Laura S. Assunção、Juliana Inaba、Tânia B. Creczynski-Pasa、Marcus M. Sá
DOI:10.1016/j.tet.2020.131231
日期:2020.6
of isothiosemicarbazones and 2-hydrazono-1,3-thiazin-4-ones through a multicomponent reaction featuring allylic bromides, carbonylcompounds and thiosemicarbazides is described. The transformations proceed under mild and environmentally benign conditions with high yields and stereoselectivity. All novel compounds were obtained in high purity without the need for chromatography stages. Different functional
Hydrophosphonylation of activated alkenes and alkynes via fluoride ion activation in ionic liquid medium
作者:E. Balaraman、Venu Srinivas、K.C. Kumara Swamy
DOI:10.1016/j.tet.2009.06.096
日期:2009.9
hydro/hydrothiophosphonylation of Baylis–Hillman adducts, substituted allylbromides, allenylphosphonates and alkynes, promoted by fluoride ion in ionic liquid, is described. Clear-cut evidence for fluoride activation of the phosphite via pentacoordinate phosphorus is provided for the first time. Also, in a comparative reaction, the product obtained was different from that from the palladium catalyzed
eco-friendly method has been developed for the synthesis of allyl thiosulfonates using Morita–Baylis–Hillman (MBH) allyl bromides and sodium arylthiosulfonates, which were readily assembled without any reagent/catalyst. Moreover, the allyl thiosulfonates were successfully transformed into a set of two synthetically viable diallyl disulfanes and unsymmetrical allyl disulfanes in the presence of Cs2CO3. The present
已经开发出一种实用、高度灵活且环保的方法,用于使用 Morita-Baylis-Hillman (MBH) 烯丙基溴和芳基硫代磺酸钠合成烯丙基硫代磺酸盐,无需任何试剂/催化剂即可轻松组装。此外,在Cs 2 CO 3存在下,烯丙基硫代磺酸盐成功地转化为一组两种合成可行的二烯丙基二硫烷和不对称烯丙基二硫烷。本协议在操作上简单方便,可生成多种功能化的烯丙基硫代磺酸盐和烯丙基二硫烷,产率良好。
Base-Dependent Cascade Synthesis of Novel Pyrano[3,2-<i>c</i>]coumarin Derivatives from Baylis–Hillman Bromide
作者:Shao-Qin Ge、Xi Yang、Bin Wu、Min Xia
DOI:10.1080/00397910903029933
日期:2010.3.12
on a base, which goes through SN2-SN2 nucleophilic substitution and intramolecular Michael addition. The product structures are confirmed by x-ray crystallography, and a tentative mechanism of the cascade process is presented.
Catalytic Asymmetric Construction of Spiro(γ-butyrolactam-γ-butyrolactone) Moieties through Sequential Reactions of Cyclic Imino Esters with Morita-Baylis-Hillman Bromides
作者:Huai-Long Teng、He Huang、Chun-Jiang Wang
DOI:10.1002/chem.201201475
日期:2012.10.1
Spiro(γ‐butyrolactam‐γ‐butyrolactone): A route to enantioenriched spiro(γ‐butyrolactam‐γ‐butyrolactone) compounds, a valuable motif for drug discovery, was developed by use of a highly efficient copper(I)/TF‐BiphamPhos‐catalyzed tandem Michael addition–elimination of homoserine lactone derived cycliciminoesters with Morita–Baylis–Hillman (MBH) bromides, followed by treatment with para‐toluenesulfonic