A direct method for the synthesis of polyfunctionalized unsaturated carbonyl derivatives by Michael addition of nitroalkanes to enediones with the help of DBU
作者:Roberto Ballini、Giovanna Bosica
DOI:10.1016/0040-4020(95)00136-v
日期:1995.4
The Michael addition of several nitroalkanes to dimethyl maleate, (Z)-3-hexene-2,5-dione, N-ethyl maleimide, and N-phenyl maleimide, in MeCN or THF, proceeds very efficiently on DBU as base, and furnishes good to high yields of polyfunctionalized unsaturated carbonyl derivatives.
stereoselective synthesis of a variety of β-nitro-α-amino carboxylic acidsvia aza-Henry (nitro-Mannich) reaction of aldimines is disclosed, yielding either anti- or a rarely reported syn-configuration. The reaction operates directly on free glyoxylic acid and generates imine species in situ. Crystallization-controlled diastereoselectivity enables isolation of the target compounds in high enantio- and diastereomeric
Weak Lewis acid for high nucleophilicity: Hydridoborate derived from B(2,6‐F2C6H3)3 shows significant hydride character. Solid‐state and solution structure analysis revealed a dihydrogen‐bonded aggregate. The new frustratedLewispair was applied in the hydrogenation of nitroolefins and acrylates (see scheme; EWG=electron‐withdrawing group). The decreased Lewis acidity provides higher reactivity and
弱路易斯酸,具有高亲核性:衍生自B(2,6-F 2 C 6 H 3)3的氢硼酸盐显示出显着的氢化物特征。固态和溶液结构分析表明,存在氢键结合的聚集体。新的受阻的路易斯对用于硝基烯烃和丙烯酸酯的氢化反应(参见方案; EWG =吸电子基团)。降低的路易斯酸度可提供更高的反应性和官能团耐受性。
Hydrogen-Bond-Assisted Sequential Reaction of Silyl Glyoxylates: Stereoselective Synthesis of Silyl Enol Ethers
作者:Chen Zhu、Man-Yi Han、Xiu-Xia Liang、Bin Guan、Pinhua Li、Lei Wang
DOI:10.1021/acs.orglett.0c03683
日期:2021.1.1
A novel hydrogen-bond-assisted sequential reaction of silyl glyoxylates is described. This method provides an efficient strategy for the synthesis of silyl enol ethers with high selectivity. In these transformations, hydrogen bonds from 2-nitroethanol and its derivatives are critical to the stereochemical outcome. Both E- and Z-isomers are achieved via Henry reaction/Brook rearrangement/elimination
描述了一种新型的氢键辅助的乙醛酸甲硅烷基酯的顺序反应。该方法为合成高选择性的甲硅烷基烯醇醚提供了有效的策略。在这些转化中,2-硝基乙醇及其衍生物的氢键对于立体化学结果至关重要。既ë -和ž 1: -异构体通过Henry反应/重排布鲁克/消除和亨利反应/重排布鲁克/复古亨利反应/消除过程,分别为(最多99实现Ž -选择性,和9.2:1 È -选择性)。
Discovery and Characterization of CD12681, a Potent RORγ Inverse Agonist, Preclinical Candidate for the Topical Treatment of Psoriasis
application for the treatment of skin diseases. These efforts culminated in the discovery of N‐(2,4‐dimethylphenyl)‐N‐isobutyl‐2‐oxo‐1‐[(tetrahydro‐2H‐pyran‐4‐yl)methyl]‐2,3‐dihydro‐1H‐benzo[d]imidazole‐5‐sulfonamide (CD12681), a potent inverse agonist with in vivo activity in an IL‐23‐induced mouse skin inflammation model.
视黄酸受体相关的孤儿受体RORγ可能对多种自身免疫性疾病有潜在影响,已成为制药行业的抢手目标。本文描述了鉴定与局部应用治疗皮肤疾病相容的有效RORγ反向激动剂的努力。这些努力最终导致发现了N-(2,4-二甲基苯基)-N-异丁基-2-氧代-1-[[(四氢-2 H-吡喃-4-基)甲基] -2,3-二氢-1 H-苯并[ d ]咪唑-5-磺酰胺(CD12681),一种有效的反向激动剂,在IL-23诱导的小鼠皮肤炎症模型中具有体内活性。