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
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.
the first time by X‐ray structural analysis. The ortho‐methoxymethyl group and the carbonyl oxygen coordinate to the iodine atom of the iminoiodinane. Activation of the N‐acyliminoiodinane was achieved by photoirradiation at 370 nm, thereby enabling reaction with various silylenol ethers to give α‐aminoketone derivatives in good to high yield. N‐sulfonyliminoiodinanes bearing ortho substituents were