Chiral 1,2,3‐Triazolium Salt Catalyzed Asymmetric Mono‐ and Dialkylation of 2,5‐Diketopiperazines with the Construction of Tetrasubstituted Carbon Centers
作者:Ju‐Song Yang、Ka Lu、Chen‐Xiao Li、Zu‐Hang Zhao、Xiao‐Ming Zhang、Fu‐Min Zhang、Yong‐Qiang Tu
DOI:10.1002/anie.202114129
日期:2022.2.21
Chiral spirocyclic-amide-derived triazolium salts were used as new phase-transfer organocatalysts for asymmetric alkylation to construct 2,5-diketopiperazine motifs containing one or two tetrasubstituted carbon centers in high yields with excellent cis-diastereoselectivity and enantioselectivity. Control experiments and DFT calculations revealed the possible reaction mechanism and the origins of the
Photocatalyzed, β-Selective Hydrocarboxylation of α,β-Unsaturated Esters with CO<sub>2</sub> under Flow for β-Lactone Synthesis
作者:Guowei Kang、Daniel Romo
DOI:10.1021/acscatal.0c05050
日期:2021.2.5
photocatalyzed, β-selective hydrocarboxylation of α,β-unsaturated esters employing CO2 radical anion generated under flow conditions was developed. A range of substrates bearing a variety of functional groups were tolerated, demonstrating chemoselectivity. A series of quaternary carboxylic acids were obtained from sterically demanding β,β-disubstituted alkenes including those derived from natural products. Mechanistic
AZEPINE DERIVATIVE, PRODUCTION THEREOF, AND USE THEREOF
申请人:Asahi Kasei Kogyo Kabushiki Kaisha
公开号:EP0661271A1
公开(公告)日:1995-07-05
An azepine derivative represented by general formula (1) or a nontoxic salt thereof, a process for producing the same, and a therapeutic agent containing the same as the active ingredient for treating diseases related to σ-receptor, wherein R represents a group represented by general formula (2) (wherein R¹ represents hydrogen, lower alkyl, lower alkoxy, hydroxy, halogen or optionally substituted phenyl, and n represents 0 or 1), C₅-C₈ cycloalkyl which may be substituted by lower alkyl, norbornyl, bicyclo[3.3.1]nonyl, naphthyl, 1,3-benzodioxolyl, pyridyl or thienyl; m represents an integer of 0 to 4; and C* represents an asymmetric carbon atom. The compound (1) and nontoxic salt thereof have a high affinity for σ-receptor but scarcely any affinity for other receptors, thus being utilized for treating diseases related to σ-receptor, such as schizophrenia.
通式(1)代表的氮杂环庚烷衍生物或其无毒盐,生产该衍生物的工艺,以及含有该衍生物作为活性成分的治疗剂,用于治疗与σ-受体有关的疾病、其中 R 代表通式 (2) 所代表的基团(其中 R¹ 代表氢、低级烷基、低级烷氧基、羟基、卤素或任选取代的苯基,且 n 代表 0 或 1)、可被低级烷基取代的 C₅-C₈ 环烷基、降冰片烷基、双环[3.3.1]壬基、萘基、1,3-苯并二恶茂基、吡啶基或噻吩基;m 代表 0 至 4 的整数;C* 代表不对称碳原子。化合物(1)及其无毒盐对σ受体有很高的亲和力,但对其他受体几乎没有亲和力,因此可用于治疗与σ受体有关的疾病,如精神分裂症。
Dienamines as Diels-Alder dienes. An efficient cyclohexannulation sequence
作者:Roger L. Snowden、Manfred Wüst
DOI:10.1016/s0040-4039(00)84076-9
日期:1986.1
Solvolytic hydroperoxide rearrangements. 2. Oxa bicyclic hemiketal peroxides from homoallylic and cyclopropylcarbinyl precursors