Synthesis of Arylglycine and Mandelic Acid Derivatives through Carboxylations of α-Amido and α-Acetoxy Stannanes with Carbon Dioxide
摘要:
Incorporation reactions of carbon dioxide (CO2) with N-Boc-alpha\-amido and a-acetoxy stannanes were developed using CsF as a mild tin activator. Monoprotected alpha-amido stannanes could be used, and the corresponding arylglycine derivatives were obtained in moderate-to-high yields under 1 MPa (10 atm) of CO2 pressure. alpha-Acetoxy stannanes also underwent carboxylation to afford mandelic acid derivatives in excellent yields under ambient CO2 pressure. Both transformations enabled the synthesis of alpha-tertiary and alpha-quaternary carboxylic acid derivatives. In addition, the chirality of (S)-N-tert-butylsulfonyl-alpha-amido stannanes was transferred with up to 90% inversion of configuration at 100 degrees C.
Selective C–F Functionalization of Unactivated Trifluoromethylarenes
作者:David B. Vogt、Ciaran P. Seath、Hengbin Wang、Nathan T. Jui
DOI:10.1021/jacs.9b06004
日期:2019.8.21
Fluorinated organic molecules are pervasive within the pharmaceutical and agrochemical industries due to the range of structural and physicochemical properties that fluorine imparts. To date, the most abundant methods for the synthesis of the aryl CF2-functionality have relied on the deoxyfluorination of ketones and aldehydes using expensive and poorly atom economical reagents. Here, we report a general
Room Temperature Aryl Trifluoromethylation via Copper-Mediated Oxidative Cross-Coupling
作者:Todd D. Senecal、Andrew T. Parsons、Stephen L. Buchwald
DOI:10.1021/jo1023377
日期:2011.2.18
A method for the roomtemperaturecopper-mediated trifluoromethylation of aryl and heteroaryl boronic acids has been developed. This protocol is amenable to normal benchtop setup and reactions typically require only 1−4 h. Proceeding under mild conditions, the method tolerates a range of functional groups, allowing access to a variety of trifluoromethylarenes.
Regio- and Diastereoselective Synthesis of 2-Arylazetidines: Quantum Chemical Explanation of Baldwin’s Rules for the Ring-Formation Reactions of Oxiranes
作者:Ervin Kovács、Ferenc Faigl、Zoltán Mucsi
DOI:10.1021/acs.joc.0c01310
日期:2020.9.4
A general, scalable two-step regio- and diastereoselective method has been described for the synthesis of versatile alkaloid-type azetidines from simple buildingblocks with excellent overall yields. In the kinetically controlled reaction, only the formation of the strained four-membered ring can be achieved instead of the thermodynamically favorable five-membered rings under appropriate conditions
Suzuki–Miyaura Cross-Coupling Reactions of Potassium Boc-Protected Aminomethyltrifluoroborate with Aryl and Hetaryl Mesylates
作者:Gary A. Molander、Inji Shin
DOI:10.1021/ol301221p
日期:2012.6.15
Palladium-catalyzed Suzuki-Miyaura cross-coupling reactions were studied with potassium Boc-protected aminomethyltrifluoroborate through C-O activation of various mesylate derivatives to afford the corresponding products in moderate to good yields.
Pd-Catalyzed Suzuki–Miyaura Cross-Coupling Reactions between Sulfamates and Potassium Boc-Protected Aminomethyltrifluoroborates
作者:Gary A. Molander、Inji Shin
DOI:10.1021/ol401021x
日期:2013.5.17
Sulfamates were studied as the electrophilic partners in the palladium-catalyzed Suzuki-Miyaura cross-coupling reaction with potassium Boc-protected primary and secondary aminomethyltrifluoroborates. A broad range of substrates was successfully coupled to provide the desired products. Complex molecules containing a new carbon-carbon bond and an aminomethyl moiety could be prepared through this developed method.