Synthesis of Optically Active Oxazolines by an Organocatalytic Isocyanoacetate Aldol Reaction with α-Keto Esters
作者:Jiean Chen、Yong Huang、Fei Wang
DOI:10.1055/s-0036-1588718
日期:2017.7
combination of an α-keto ester and an α-isocyanoacetate establishes an oxazoline which could be a potential chiral ligand for metal-mediated catalysis, and also could be easily converted into an opticallyactive β-hydroxy-α-amino acid.
据报道,对映选择性 [3+2] 环化可用于构建中等产率和高达 97% ee 的手性恶唑啉骨架。反应性和立体化学区分源于双功能催化剂的非共价相互作用和取向。α-酮酯和 α-异氰基乙酸酯的新组合建立了恶唑啉,它可以成为金属介导催化的潜在手性配体,也可以很容易地转化为光学活性的 β-羟基-α-氨基酸。
Divergent Photocatalytic Reactions of α-Ketoesters under Triplet Sensitization and Photoredox Conditions
作者:Jian Zheng、Xiao Dong、Tehshik P. Yoon
DOI:10.1021/acs.orglett.0c02314
日期:2020.8.21
The long-lived triplet excited states of transition metal photocatalysts can activate organic substrates via either energy- or electron-transfer pathways, and the rates of these processes can be influenced by rational tuning of the reaction conditions. The characteristic reactive intermediates generated, however, are distinct and can exhibit very different reactivity patterns. This mechanistic diversity