Hydrofluoromethylation of alkenes with fluoroiodomethane and beyond
作者:Sandrine M. Hell、Claudio F. Meyer、Sebastiano Ortalli、Jeroen B. I. Sap、Xuanxiao Chen、Véronique Gouverneur
DOI:10.1039/d1sc03421a
日期:——
for the direct hydrofluoromethylation of alkenes is reported for the first time. This straighforward silyl radical-mediated reaction utilises CH2FI as a non-ozone depleting reagent, traditionally used in electrophilic, nucleophilic and carbene-type chemistry, but not as a CH2F radical source. By circumventing the challenges associated with the high reduction potential of CH2FI being closer to CH3I than
首次报道了烯烃直接氢氟甲基化的方法。这种直接的甲硅烷基自由基介导的反应利用 CH 2 FI 作为非臭氧消耗试剂,传统上用于亲电、亲核和卡宾型化学,但不作为 CH 2 F 自由基源。通过规避与 CH 2 FI的高还原电位比 CF 3 I更接近 CH 3 I相关的挑战,并利用 C-I 键的有利键解离能,我们证明了原料缺电子烯烃被转化在 (Me 3 Si) 3的干预下,由净氢氟甲基化产生的产物蓝色 LED 激活下的 SiH。这种看似简单但功能强大的方法已扩展到一系列(卤)甲基自由基前体,包括 ICH 2 I、ICH 2 Br、ICH 2 Cl 和 CHBr 2 F,以及 CH 3 I 本身;因此后一种试剂能够直接加氢甲基化。这种多功能化学被应用于18 F-、13 C- 和 D- 标记的试剂以及复杂的生物相关烯烃,为药物化学和正电子发射断层扫描中的应用提供了五十多种产品。
Hydrosulfonylation of Alkenes with Sulfonyl Chlorides under Visible Light Activation
作者:Sandrine M. Hell、Claudio F. Meyer、Antonio Misale、Jeroen B. I. Sap、Kirsten E. Christensen、Michael C. Willis、Andrés A. Trabanco、Véronique Gouverneur
DOI:10.1002/anie.202004070
日期:2020.7.6
Sulfonyl chlorides are inexpensive reactants extensively explored for functionalization, but never considered for radical hydrosulfonylation of alkenes. Herein, we report that tris(trimethylsilyl)silane is an ideal hydrogen atom donor enabling highly effective photoredox‐catalyzed hydrosulfonylation of electron‐deficient alkenes with sulfonyl chlorides. To increase the generality of this transformation
The present invention provides a polymerizable compound having high storage stability without causing crystal precipitation when added to a polymerizable composition. The present invention also provides a polymerizable composition containing the compound. When the filmy polymer produced through polymerization of the polymerizable composition is irradiated with UV light, it hardly discolors or peels from substrate. Further, the present invention provides a polymer produced through polymerization of the polymerizable composition and an optically anisotropic body using the polymer.
Discovery of selective fragment-sized immunoproteasome inhibitors
作者:Levente Kollár、Martina Gobec、Bence Szilágyi、Matic Proj、Damijan Knez、Péter Ábrányi-Balogh、László Petri、Tímea Imre、Dávid Bajusz、György G. Ferenczy、Stanislav Gobec、György M. Keserű、Izidor Sosič
DOI:10.1016/j.ejmech.2021.113455
日期:2021.7
benzoXazole-2(3H)-thiones) as inhibitors of the chymotrypsin-like (β5i) subunit of the immunoproteasome. A subsequent structure-activity relationship study provided us with an insight regarding growing vectors. Binding to the β5i subunit was shown and selectivity against the β5subunit of the constitutive proteasome was determined. Thorough characterization of these compounds suggested that they inhibit the immunoproteasome
蛋白酶体有助于维持蛋白质稳态,其抑制作用对某些类型的癌症和自身免疫疾病有益。然而,对健康细胞中蛋白酶体的抑制会导致不希望有的副作用,并且已经做出重大努力来鉴定对免疫蛋白酶体具有特异性的抑制剂,特别是用于治疗表现出该蛋白酶体同种型的水平和活性增加的疾病。在这里,我们报告了我们为发现人类免疫蛋白酶体的片段大小抑制剂所做的努力。内部结构多样化片段文库的筛选导致苯并[ d ]恶唑-2(3 H )-硫酮、苯并[ d ]噻唑-2(3 H )-硫酮、苯并[ d ]恶唑-2(3 H )-硫酮的鉴定]咪唑-2(3 H )-硫酮和 1-甲基苯并[ d ]咪唑-2(3 H )-硫酮(通用术语苯并恶唑-2(3 H))-硫酮) 作为免疫蛋白酶体胰凝乳蛋白酶样 (β5i) 亚基的抑制剂。随后的构效关系研究为我们提供了有关生长载体的见解。显示了与 β5i 亚基的结合,并确定了对组成型蛋白酶体的 β5 亚基的选择性。对这些化合物的彻底表征表明,它们通过与
Silyl Radical-Mediated Activation of Sulfamoyl Chlorides Enables Direct Access to Aliphatic Sulfonamides from Alkenes
作者:Sandrine M. Hell、Claudio F. Meyer、Gabriele Laudadio、Antonio Misale、Michael C. Willis、Timothy Noël、Andrés A. Trabanco、Véronique Gouverneur
DOI:10.1021/jacs.9b13071
日期:2020.1.15
However, sulfamoyl and sulfonyl chlorides can be easily activated by Cl-atom abstrac-tion by a silyl radical with similar rates. This later mode of acti-vation was therefore selected to access aliphatic sulfonamides applying a single-step hydrosulfamoylation using inexpensive olefins, tris(trimethylsilyl)silane and photocatalyst Eosin Y. This late-stage functionalization protocol generates molecules
氨磺酰氯的单电子还原比磺酰氯更具挑战性。然而,氨磺酰氯和磺酰氯可以很容易地通过甲硅烷基的 Cl 原子提取以相似的速率被激活。因此,选择这种后期的活化模式来获得脂肪族磺酰胺,使用廉价的烯烃、三(三甲基甲硅烷基)硅烷和光催化剂曙红 Y 进行单步氢氨磺酰化。这种后期功能化方案生成的分子与含磺酰胺的环丁基-直接用于药物化学的螺环吲哚。