C–H Activation Guided by Aromatic N–H Ketimines: Synthesis of Functionalized Isoquinolines Using Benzyl Azides and Alkynes
摘要:
Aromatic N-H ketimines were in situ generated from various benzylic azides by ruthenium catalysis for the subsequent Rh-catalyzed annulation reaction with alkynes to give the corresponding isoquinolines. In contrast to conventional synthetic methods for aromatic NH ketimines, our protocol works under mild and neutral conditions, which enabled the synthesis of isoquinolines having various functionalities such as carbonyl, ester, alkenyl, and ether groups. In addition, the imidates generated from alpha-azido ethers were successfully used for the synthesis of 1-alkoxyisoquinolines.
Aldehyde and Ketone Synthesis by P450-Catalyzed Oxidative Deamination of Alkyl Azides
作者:Simone Giovani、Hanan Alwaseem、Rudi Fasan
DOI:10.1002/cctc.201600487
日期:2016.8.22
secondary alkyl azides to yield ketones. Mechanistic studies and Michaelis–Menten analyses provided insight into the mechanism of the reaction and the impact of active‐site mutations on the catalytic properties of the P450. Altogether, these studies demonstrate that engineered P450 variants represent promising biocatalysts for the synthesis of aryl aldehydes and ketones through the oxidative deamination
Efficient conversion of primary azides to aldehydes catalyzed by active site variants of myoglobin
作者:Simone Giovani、Ritesh Singh、Rudi Fasan
DOI:10.1039/c5sc02857d
日期:——
Engineered variants of myoglobin can efficiently catalyze the conversion of primary azides to aldehydes in water and at room temperature
经过工程改造的肌红蛋白变种可以在水中且室温下高效催化将主要偶氮化合物转化为醛。
Chemodivergent Staudinger Reactions of Secondary Phosphine Oxides and Application to the Total Synthesis of LL–D05139β Potassium Salt
作者:Wenjun Luo、Fang Xu、Zhenguo Wang、Jiyan Pang、Zixu Wang、Zhixiu Sun、Aiyun Peng、Xiaohui Cao、Le Li
DOI:10.1002/anie.202310118
日期:2023.10.9
Unprecedented chemodivergent Staudinger reactions of secondary phosphine oxides (SPO) have been developed. Reagent-controlled 1- or 2-nitrogen atom exclusions from azides have been achieved. Conversion of a chiral SPO to a phosphinic amide was stereoretentive, and the potassium salt of natural product LL-D05139β was synthesized for the first time.
The electrocarboxylation of α,α-dichloroarylmethane derivatives in the presence of CO2 was achieved, providing several α-chloroarylacetic acid derivatives with modest yields but high selectivity (chlorinated vs. non-chlorinated or dicarboxylic acid products). The obtained products were then involved in several chemical transformations, underlining their potential as versatile intermediates in synthetic
在 CO2 存在下实现了 α,α-二氯芳基甲烷衍生物的电羧化,提供了几种产率适中但选择性高的 α-氯芳基乙酸衍生物(氯化产物与非氯化产物或二羧酸产物)。获得的产品随后进行了多次化学转化,突显了它们作为合成化学中多功能中间体的潜力。基于控制实验和循环伏安法(CV)研究还提出了一种机制。
Polymerization process for ionic monomers
申请人:CARNEGIE MELLON UNIVERSITY
公开号:EP1801129A2
公开(公告)日:2007-06-27
The present invention describes a controlled polymerization process for (co)polymerization of radically polymerizable ionic monomers, comprising initiating the polymerization of free radically (co)polymerizable ionic monomers in the presence of a system initially comprising a transition metal complex, and an initiator comprising a radically transferable atom or group; and an excess of one or more uncomplexed ligands. It further describes a controlled polymerization process for the preparation of water soluble block copolymers comprising polymerizing radically (co)polymerizable monomers in the presence of a system initially comprising a water soluble macroinitiator, and a transition metal complex comprising one or more ligands.