Azopyridine-based chiral oxazolines with rare-earth metals for photoswitchable catalysis
作者:Kento Nakamura、Masaru Kondo、Chandu G. Krishnan、Shinobu Takizawa、Hiroaki Sasai
DOI:10.1039/d1cc02602j
日期:——
An azopyridine-based oxazoline was developed for utilizing azo group coordination and isomerization as a photoswitchable ligand. The ligand coordinated to rare-earth metal (RE) catalyst underwent efficient E/Z photoisomerization, suggesting tri- and bidentate coordinationswitching. The photoisomerization of the ligand enabled modulation of the enantioselectivity of an RE-catalyzed aminal forming reaction
开发了一种基于偶氮吡啶的恶唑啉,用于利用偶氮基团的配位和异构化作为光开关配体。与稀土金属 (RE) 催化剂配位的配体经历了有效的E / Z光异构化,表明三齿和双齿配位转换。配体的光异构化能够调节 RE 催化的氨基形成反应的对映选择性。
Asymmetric synthesis of 3,4-dihydro-2H-1,2,4-benzothiadiazine-1,1- dioxides catalyzed by scandium(III)-inda-Pybox
作者:Peng Du、Haifeng Zhou、Yuebo Sui、Qixing Liu、Kun Zou
DOI:10.1016/j.tet.2016.02.009
日期:2016.3
Asymmetricsynthesis of 3,4-dihydro-2H-1,2,4-benzothiadiazine-1,1-dioxides (DHBDs) was realized using readily available scandium(III)-inda-Pybox as the catalyst. It represents the first example focusing on systematic study of asymmetricsynthesis of DHBDs, and a series of enantioselective 3-alkyl, or 3-aryl DHBDs were obtained with up to 93% ee.
3,4-二氢-2 H -1,2,4-苯并噻二嗪-1,1-二氧化物(DHBDs)的不对称合成是使用容易获得的scan(III)-inda -Pybox作为催化剂实现的。它代表着专注于系统研究DHBD不对称合成的第一个例子,并获得了一系列对映选择性的3-烷基或3-芳基DHBD,其ee最高可达93%。