Ammonium iodide-induced sulfonylation of alkenes with DMSO and water toward the synthesis of vinyl methyl sulfones
作者:Xiaofang Gao、Xiaojun Pan、Jian Gao、Huawen Huang、Gaoqing Yuan、Yingwei Li
DOI:10.1039/c4cc07606k
日期:——
A novel ammonium iodide-induced sulfonylation of alkenes with DMSO and water toward the synthesis of vinyl methylsulfones is described. The process proceeded smoothly under metal-free conditions with high stereoselectivity and good functional group tolerance. The reaction mechanism was revealed to proceed through a domino reaction of oxidation and elimination after the radical addition to alkenes
A facile route to the synthesis of γ-sulfonyl lactones 5 and β-sulfonyl styrenes 6 has been developed, achieving moderate to good yields via the (1) NaH mediated Michael addition of β-ketosulfones 3 and methyl acrylate in refluxing THF and (2) NaBH4 mediated stereoselective reduction/lactonization of δ-ketoesters 4 in boiling MeOH, or (3) boron trifluoride etherate mediated ring-opening of lactones
Acid-Promoted Reaction of Sulfonyl Chlorides with Alkenes: New Approach to the Regioselective Synthesis of β-Hydroxyl Sulfone Derivatives
作者:Chanjuan Xi、Chunbo Lai、Chao Chen、Ruji Wang
DOI:10.1055/s-2004-829090
日期:——
Reaction of sulfonylchlorides with alkenes and water in the presence of catalytic amount of sulfonic acid provided (3-hydroxyl sulfone derivatives in high yields.
磺酰氯与烯烃和水在催化量的磺酸存在下反应,得到了高产率的 3-羟基砜衍生物。
An improved synthesis of β-hydroxysulfones via <i>α</i>-sulfonylcarbanions in liquid ammonia. The direct metalation of dialkyl and aryl alkyl sulfones
作者:D. F. Tavares、P. F. Vogt
DOI:10.1139/v67-246
日期:1967.7.1
Dimethyl sulfone, methyl p-tolyl sulfone, ethyl p-tolyl sulfone, benzyl p-tolyl sulfone, and tetrahydrothiophene 1,1-dioxide were rapidly and quantitatively metalated by lithium amide (or potassium...
二甲基砜、甲基对甲苯砜、乙基对甲苯砜、苄基对甲苯砜和四氢噻吩1,1-二氧化物被氨基锂(或钾...
Efficient synthesis of an apremilast precursor and chiral β-hydroxy sulfones <i>via</i> ketoreductase-catalyzed asymmetric reduction
作者:Jiyang Guo、Xiao Gao、Dong Qian、Huibin Wang、Xian Jia、Wenhe Zhang、Bin Qin、Song You
DOI:10.1039/d1ob02485j
日期:——
substrate loading. Furthermore, we investigated the substrate scope of β-keto sulfones by using LfSDR1-V186A/E141I and CgKR1-F92I to produce both enantiomers of the corresponding β-hydroxy sulfones, with good-to-excellent conversion (up to >99%) and enantioselectivity (up to 99.9% ee) being obtained in most cases. Finally, the gram-scale synthesis of (R)-2a was performed by employing the crude enzyme of
酮还原酶(KRED)催化前手性酮的不对称还原是合成手性醇的一种有吸引力的方法。在此,鉴定出具有互补立体偏好的两个 KRED LfSDR1-V186A/E141I 和 CgKR1-F92I 用于还原阿普斯特前手性酮中间体1a 。 LfSDR1-V186A/E141I表现出>99%转化率和99.2% ee,在50 g L -1底物负载量下产生阿普斯特手性醇中间体(( R ) -2a )。此外,我们通过使用 LfSDR1-V186A/E141I 和 CgKR1-F92I 来研究 β-酮基砜的底物范围,以产生相应 β-羟基砜的两种对映体,具有良好到优异的转化率(高达 >99%)和大多数情况下可获得对映选择性(高达 99.9% ee)。最后,利用LfSDR1-V186A/E141I的粗酶和BsGDH进行克级合成( R ) -2a ,得到所需的对映体,转化率>99%,分离收率85.9%,ee 99.2%。本研究提出了合成手性