Formation of<i>N</i>-Tributylstannyl Heterocycle from Bis(tributyltin) Oxide and ω-Haloalkyl Isocyanate. One-Pot Convenient Synthesis of 2-Oxazolidinones and Tetrahydro-2<i>H</i>-1,3-oxazin-2-one
Novel types of compounds, N-tributylstannyl-2-oxazolidinone (4a) and tetrahydro-2H-1,3-oxazin-2-one (4b), are formed from the adduct of (n-Bu3Sn)2O (1) with ω-haloalkyl isocyanate (2), and the subsequent coupling reaction with alkyl halides gives a variety of N-substituted 2-oxazolidinones and tetrahydro-2-oxazinones in a one-pot procedure. Both the cyclization and the coupling reaction proceed quantitatively in the presence of HMPA which enhances the reactivity of the Sn–heteroatom bond by coordination.
Formation of N-tributylstannyl-2-oxazolidone from (Bu3Sn)2O and 2-chloroethyl isocyanate
作者:Ikuya Shibata、Akio Baba、Haruo Matsuda
DOI:10.1039/c39860001703
日期:——
N-Tributylstannyl-2-oxazolidone is formed from the reaction of (Bu3Sn)2O and 2-chloroethyl isocyanate in the presence of hexamethylphosphoric triamide, and reacts with electrophiles to give N-substituted 2-oxazolidones in good yields.
Can Decarbonylation of Acyl Radicals Be Overcome in Radical Addition Reactions? En Route to a Solution Employing <i>N</i>-Acyl Oxazolidinones and SmI<sub>2</sub>/H<sub>2</sub>O
作者:Christina M. Jensen、Karl B. Lindsay、Rolf H. Taaning、Jakob Karaffa、Anna Mette Hansen、Troels Skrydstrup
DOI:10.1021/ja050420u
日期:2005.5.1
The application of acyl radicals in radical addition reactions in the absence of a CO atmosphere is generally limited to aryl or alpha-unsubstituted alkyl acyl radicals due to competing decarbonylations where the rate constant for this degradation process surpasses 104 s-1. In this work, a potential solution to avoid the problem of decarbonylations is presented employing N-acyl oxazolidinones which
Cyclopropanes via nucleophilic attack at the central carbon of (π-allyl)palladium complexes
作者:Andreas Wilde、Andreas R. Otte、H. Martin R. Hoffmann
DOI:10.1039/c39930000615
日期:——
A variety of carboanions (pKa of protonated carbanion 20) combine with (π-allyl)palladiumcomplexes in the presence of N, N, N′, N′, tetramethylethylenediamine (TMEDA)via a new reaction mode, giving functionalized cyclopropanes.
在N,N,N ',N ',四甲基乙二胺(TMEDA)存在下,各种碳负离子(质子化碳负离子20的p K a)与(π-烯丙基)钯配合物结合,通过新的反应模式产生官能化的环丙烷。
Synthesis of .beta.-keto esters by the Reformatsky reaction of 3-acyloxazolidin-2-ones and -thiazolidine-2-thiones