Oxidation of alcohols to aldehydes and ketones via aci-nitroesters of ethyl nitroacetate under neutral conditions
作者:Oyo Mitsunobu、Naoyuki Yoshida
DOI:10.1016/s0040-4039(01)92914-4
日期:——
The reaction of alcohols with ethyl nitroacetate, diethyl azodicarboxylate, and triphenylphosphine gave the corresponding aldehydes or ketones in 52–85% yields.
醇与硝基乙酸乙酯,偶氮二羧酸二乙酯和三苯基膦的反应以52-85%的收率得到相应的醛或酮。
Fluoride Anion Catalyzed Mukaiyama–Aldol Reaction: Rapid Access to α-Fluoro-β-hydroxy Esters
Mukaiyama–aldol reaction is probably one of the most efficient strategies to prepare synthetically useful β-hydroxy carbonyl compounds. However, only several reported methods were concerned with the accesses to α-fluoro-β-hydroxy esters. Herein, we report a protocol for a fluoride anion-mediated Mukaiyama aldolreaction with low catalytic loading in a short reaction time to incorporate fluorine at the α position
<i>Twist</i> Does a <i>Twist</i> to the Reactivity: Stoichiometric and Catalytic Oxidations with <i>Twisted</i> Tetramethyl-IBX
作者:Jarugu Narasimha Moorthy、Kalyan Senapati、Keshaba Nanda Parida、Samik Jhulki、Kunnikuruvan Sooraj、Nisanth N. Nair
DOI:10.1021/jo201491q
日期:2011.12.2
The methyl groups in TetMe-IBX lower the activation energy corresponding to the rate-determining hypervalent twisting (theoretical calculations), and the steric relay between successive methyl groups twists the structure, which manifests in significant solubility in common organic solvents. Consequently, oxidations of alcohols and sulfides occur at room temperature in common organic solvents. In situ generation of the reactive TetMe-IBX from its precursor iodo-acid, i.e., 3,4,5,6-tetramethyl-2-iodobenzoic acid, in the presence of oxone as a co-oxidant facilitates the oxidation of diverse alcohols at room temperature.
Selective hydrogenations promoted by copper catalysts. 1. Chemoselectivity, regioselectivity, and stereoselectivity in the hydrogenation of 3-substituted steroids