Methyl indolenines (4a-c) and (5a-c) were prepared in high yield by a Fischer indole synthesis reaction of o,m-tolylhydrazine hydrochlorides (1a-b) with isopropyl methyl ketone (2) and 2-methylcyclohexanone (3) in acetic acid at room temperature. o,p- Nitrophenylhydrazines (1c-d) were reacted with 2-methylcyclohexanone (3) in acetic acid at reflux to give nitroindolenines (5d-e), while the attempted
Diastereoselective synthesis of indolenine-based spiro[pyrazolone-4,2′-pyrrolidine] scaffolds <i>via</i> 1,3-dipolar cycloaddition of 4-aminopyrazolones, aldehydes, and indolenines
作者:Shah Nawaz、Shiqiang Wei、Yue Huang、Wenyao Wang、Jingping Qu、Baomin Wang
DOI:10.1039/d1ob01135a
日期:——
report a one-pot [3 + 2] cycloaddition of 4-aminopyrazolones, indolenines, and aldehydes. The reaction utilized in situ generated azomethine ylides as 1,3-dipoles and 2-alkenylindolenines as dipolarophiles affording indolenine-derived spiro[pyrazolone-4,2′-pyrrolidine] scaffolds with four contiguous stereocenters with excellent yields (up to 95%) and diastereoselectivities (up to >20 : 1 dr) under
The invention provides a novel class of cyanine dyes that are functionalized with sulfonic acid groups and a linker moiety that facilitates their conjugation to other species and substituent groups which increase the water-solubility, and optimize the optical properties of the dyes. Also provided are conjugates of the dyes, methods of using the dyes and their conjugates and kits including the dyes and their conjugates.
The invention provides a novel class of cyanine dyes that are functionalized with sulfonic acid groups and a linker moiety that facilitates their conjugation to other species and substituent groups which increase the water-solubility, and optimize the optical properties of the dyes. Also provided are conjugates of the dyes, methods of using the dyes and their conjugates and kits including the dyes and their conjugates.
ORGANIC ELECTROLUMINESCENT MATERIALS AND ORGANIC ELECTROLUMINESCENT DEVICES
申请人:Shenzhen China Star Optoelectronics Technology Co., Ltd.
公开号:US20180088123A1
公开(公告)日:2018-03-29
The present application discloses an organic electroluminescent material, a molecular formula thereof is Da-π-Ac, wherein Da is an aggregation-induced emission group, π is a conjugated bond, and Ac is a strong electron-withdrawing group. The organic electroluminescent material of the present application has a simple preparation method, high yield, good thermodynamic stability, can cover the visible region, have excellent electroluminescence effect, and can prepare undoped type of organic electroluminescent devices.