A novel divergent domino annulation reaction of prop-2-ynylsulfonium salts with sulfonyl-protected β-amino ketones has been developed, affording various epoxide-fused 2-methylenepyrrolidines and S-containing pyrroles in moderate to excellent yields. Prop-2-ynylsulfonium salts act as C2 synthons in the reactions providing a promising epoxide-fused skeleton in a single operation with readily accessible
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Alkoxyphenyliminoiodanes: Highly Efficient Reagents for the Catalytic Aziridination of Alkenes and the Metal‐Free Amination of Organic Substrates
作者:Akira Yoshimura、Victor N. Nemykin、Viktor V. Zhdankin
DOI:10.1002/chem.201102265
日期:2011.9.12
Owing to the presence of the ortho‐substituent on the phenyl ring, these new iminoiodanes have excellent solubility in organic solvents and are efficient reagents for the catalytic aziridination of alkenes or the metal‐free tosylamination of organic substrates (see scheme, Ts=tosyl).
An efficient and new approach has been developed to synthesize bis(β,β'-dialkoxy carbonyl) derivatives through the reaction between N-tosylaziridines and malonate esters under ambient air using tBuOK in DMSO solvent. A plausible reaction pathway has been predicted. Control experiments suggested that the reactions proceed through the formation of α-aminoketones. This reaction offers a broad substrate
Metal-Free Amidation Reactions of Terminal Alkynes with Benzenesulfonamide
作者:Sachinta Mahato、Sougata Santra、Grigory V. Zyryanov、Adinath Majee
DOI:10.1021/acs.joc.8b03065
日期:2019.3.15
synthesize α-sulfonylamino ketones through the reaction between terminal alkynes and sulfonamides under ambient air using PIDA (diacetoxy iodobenzene). A library of α-sulfonylamino ketone derivatives having a variety of substituents has been synthesized. A plausible reaction pathway has been predicted. This reaction offers a broad substrate scope, metal-free synthesis, excellent regioselectivity, easily
Asymmetric Synthesis of Enantioenriched 6-Hydroxyl Butyrolactams Promoted by N-Heterocyclic Carbene
作者:Zhouli Hu、Ying Zhu、Zhenqian Fu、Wei Huang
DOI:10.1021/acs.joc.9b01490
日期:2019.8.16
Herein, an efficient route to synthesize 6-hydroxyl butyrolactams has been successfully developed via an N-heterocycliccarbene-catalyzed formal [3 + 2] annulation of bromoenals with α-amino ketones, followed by reduction. Remarkably, enantioenriched epi-neoclausenamide, which is one of the clausenamide derivatives, could be efficiently prepared by this strategy.