Design, Preparation, X-ray Crystal Structure, and Reactivity of <i>o</i>-Alkoxyphenyliodonium Bis(methoxycarbonyl)methanide, a Highly Soluble Carbene Precursor
作者:Chenjie Zhu、Akira Yoshimura、Lei Ji、Yunyang Wei、Victor N. Nemykin、Viktor V. Zhdankin
DOI:10.1021/ol301268j
日期:2012.6.15
The preparation, X-ray structure, and reactivity of new, highly soluble, and reactive iodonium ylides derived from malonate methyl ester and bearing an ortho substituent on the phenyl ring are reported. These new reagents show higher reactivity than common phenyliodonium ylides in the Rh-catalyzed cyclopropanation, C–H insertion, and transylidation reactions under homogeneous conditions.
Cycloaddition reactions of cycloimmonium ylides with triphenylcyclopropene
作者:Kiyoshi Matsumoto、Takane Uchida
DOI:10.1039/p19810000073
日期:——
course of the reaction is discussed qualitatively. The pyrazinium dicyanomethylide (16) with TPP produces the 7-azaindolizine (19), whereas pyridazinium (17) and phthalazinium (18) dicyanomethylides give the primary adducts (20) and (21), respectively. Reaction of pyridinium bis(alkoxycarbonyl)methylides (22) with TPP gives, however, generally poor or no yield of the indolizines.
On the mechanism of C ⇄ N migration of alkoxycarbonyl groups in reactions of pyridinium ylides with isocyanates
作者:Yu. G. Gololobov、N. V. Kashina、O. A. Linchenko、P. V. Petrovskii、N. P. Gambaryan、W. Friedrichsen
DOI:10.1023/b:rucb.0000011888.26449.21
日期:2003.10
New examples of reversible C ⇄ N migrations of alkoxycarbonyl groups, which occur in the reactions of pyridinium and 3-(diethylcarbamoyl)pyridinium ylides, viz., derivatives of dimethyl and diethyl malonates, with aryl isocyanates were studied. The mechanism of migration of the methoxycarbonyl group from the carbon atom to the nitrogen atom was considered on the basis of quantum-chemical calculations
研究了发生在吡啶鎓和 3-(二乙基氨基甲酰基)吡啶鎓叶立德反应中的烷氧羰基可逆 C ⇄ N 迁移的新例子,即丙二酸二甲酯和二乙酯的衍生物与异氰酸芳基酯的反应。在量子化学计算的基础上考虑了甲氧基羰基从碳原子迁移到氮原子的机制。吡啶鎓叶立德对异氰酸酯基团的初级攻击的产物被确定为以低势垒重排形成氨基甲酸酯,而不会形成环状中间体化合物。
Cu(II)-Catalyzed Multicomponent Reaction of Pyridine Derivatives/Isoquinolines with Iodonium Ylide and 1,4-Quinones Using Mechanochemistry
scalability of the protocol was illustrated by successfully performing the reaction in the gram scale. The photoluminescence and related cellular study revealed that these can be used as a fluorescent chromophore-based cellular probe. A clean reaction profile and a facile experimental setup that is devoid of anhydrous reaction conditions and toxic organic solvents have established the advantages of this
Light-Induced Generation and Cycloaddition Reactions of Benzyne: Synthesis of Naphthoxindoles E and Annulated Indolizines
作者:Haya Khan、Dhiraj Barman、Subhabrata Sen
DOI:10.1021/acs.joc.4c00257
日期:——
dienophiles in numerous cycloadditionreactions. However, in situgeneration of benzyne involves either base-mediated thermal reactions, low-temperature conditions, or metal-catalyzed reactions of substituted arenes. This limits the applicability of benzynes as suitable dipolarophiles in cycloadditionreactions. Herein, we have reported a UVA (365 nM)-induced in situgeneration of benzynes (from triazenyl