An unprecedented boron-containing fluorophore, π-extended cis-stilbene, obtained via alkynylboration reaction of alkynamide is reported. Boron-containing π-extended cis-stilbenes emit fluorescence with high quantum yields in the solid state and exhibit aggregation-induced emission enhancement. The broad substrate scope of the alkynylboration reaction offers facile access to electronically diverse structures
Intermolecular Asymmetric Carboesterification of Alkenes by Using Chiral Amine Auxiliaries under O<sub>2</sub>: Synthesis of Enantioenriched α-Methylene-γ-Lactones through Chloropalladation of Alkynes
Herein, the first example of chloropalladation‐initiated asymmetric intermolecularcarboesterification of alkenes with alkynes by using chiral amine auxiliaries is reported. The use of (1S,2S)‐N1,N1‐dimethylcyclohexane‐1,2‐diamine auxiliaries is essential for providing α‐methylene‐γ‐lactones products in moderate to high yields and excellent enantioselectivities at room temperature. Moreover, the chiral
In(III)-Catalyzed Direct Regioselective Syntheses of 1-Naphthaldehyde Derivatives <i>via</i> a Hidden Aldehyde 1,3-Translocation and Disjointed CO<sub>2</sub> Extrusion
作者:Sabera Sultana、Gisela A. González-Montiel、Samjhana Pradhan、Hari Datta Khanal、Sagar D. Nale、Paul Ha-Yeon Cheong、Yong Rok Lee
DOI:10.1021/acscatal.1c00629
日期:2021.6.4
A highly regioselective annulation of 3-formylchromones with alkynes in the presence of indium triflate leads to the direct construction of diverse 1-naphthaldehyde derivatives. This one-pot de novo protocol features an unusual aldehyde 1,3-translocation and disjointed CO2 extrusion. This methodology is effective for the construction of structurally diverse 1-naphthaldehydes bearing chiral moieties
在三氟甲磺酸铟存在下,3-甲酰基色酮与炔烃的高度区域选择性环化可直接构建多种 1-萘醛衍生物。这种一锅从头协议具有不寻常的醛 1,3-易位和脱节的 CO 2挤出。该方法可有效构建具有手性部分和多芳烃的结构多样的 1-萘醛。这些萘醛可以进一步轻松地加工成各种官能团。密度泛函理论计算表明,这种 In(III) 催化的反应似乎是通过逐步脱芳环化、内酯化、环收缩以及最后排出 CO 2 进行的. 最有趣的是,醛易位不是通过醛的转座而是通过底物芳烃的骨架重排发生。