Triflic acid-catalyzed <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mrow><mml:msub><mml:mrow><mml:mtext>C</mml:mtext></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mtext>sp</mml:mtext></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:msub><mml:ms>–</mml:ms><mml:mtext>H</mml:mtext></mml:mrow></mml:math> functionalization of 2-methyl azaarenes with a α-trifluoromethyl imino ester
作者:Mark Blocker、Supriya Immaneni、Abid Shaikh
DOI:10.1016/j.tetlet.2014.08.061
日期:2014.10
imino ester is described. A catalytic amount of triflic acid provided straightforward access to the corresponding trifluoromethylated amino esters via concomitant in situ one step N-alkyl deprotection. On further hydrolysis of ester, synthesis of quinoline derived unnatural trifluoromethylated amino acids has been achieved in a short and efficient manner.
Formylation of Fluoroalkyl Imines through Visible-Light-Enabled H-Atom Transfer Catalysis: Access to Fluorinated α-Amino Aldehydes
作者:Sen Yang、Shuangyu Zhu、Dengfu Lu、Yuefa Gong
DOI:10.1021/acs.orglett.9b00128
日期:2019.4.5
visible-light-enabled catalytic formylation of fluoroalkyl imines is developed. With readily accessible starting materials and organocatalysts, this method provides a general approach to masked fluoroalkyl amino aldehydes. A synergistic catalytic effect between the photosensitizer and the H atom transfer agent was proven pivotal to this transformation. After removing the mask, free aldehydes can be obtained and
Biomimetic transamination of α-keto perfluorocarboxylic esters. An efficient preparative synthesis of β,β,β-trifluoroalanine
作者:Vadim A Soloshonok、Valery P Kukhar
DOI:10.1016/s0040-4020(97)00517-6
日期:1997.6
An efficient large-scale preparative synthesis of biologically interesting β,β,β-trifluoroalanine through the biomimetic transamination of the ethyl trifluoropyruvate has been developed. The azomethine—azomethine isomerization of the N-(1-phenyl)ethylimine of ethyl trifluoropyruvate to the N-(1-phenyl)ethylidene alanine ethyl ester, a key stage of the process, was found to occur under the mild reaction
Tandem alkylation-defluorination reaction: Synthesis of 2-(N-alkyl-N-aryl)amino-3,3-difluoropropenoates from 2-(N-aryl)imino-3,3,3-trifluoropropanoates
novel synthesis of fluoroolefins from trifluoromethylated compounds with organometallic reagents was developed. The reaction seems to proceed via 1,4-alkylation on imino nitrogen followed by defluorination of the trifluoromethyl group. Diethylzinc was found to be an efficient reagent for the preparation of 2-(N-aryl-N-ethyl)amino-3,3-difluoropropenoates in excellent yield. A similar synthesis of monofluoroolefin
Photoredox Microfluidic Synthesis of Trifluoromethylated Amino Acids
作者:Jiyang Liu、Weigang Zhang、Xiangzhang Tao、Qing Wang、Xiaochen Wang、Yi Pan、Jinzhu Ma、Liang Yan、Yi Wang
DOI:10.1021/acs.orglett.3c00915
日期:2023.5.5
Fluorinated aminoacids are a class of highly valuable building blocks that are widely employed in biological science and pharmaceutical industry for improved stability, activity, and folding property of proteins. However, the synthetic approach has conventionally been constrained by harsh conditions and limited substrate range. We demonstrate a general synthetic protocol for photoinduced α-CF3 amino acids