1.1.2- tris methoxycarbonyl

H-Azepine, 2,6,7-tri(methoxycarbonyl)-ring inversion, 7, 499 Azepine-1-carboxylic acid tricarbonylruthenium complexes, 7, 523 1 H-Azepine-2,3-dicarboxylic acid, 4,7-dihydro-6-phenyl-diethyl ester synthesis, 7, 539-540 1 H-Azepine-3,6-dicarboxylic acid... 

Zur Umsetzung von Tetrathiophosphorsaure-tris-[methoxycarbonyl-methylester] mit Butylamin (Benzol, 6 Stdn., 20°) zum Trithiophosphorsaure-bis-[methoxycarbonyl-methylester]-butylanud (630/o) s. Lit.607. 

In comparing the overall size of the bulky Cp s to n-Cp (1) we would like to coin the additional term supracyclopentadienes for these systems to describe their large molecular size. These bulky or supra-Cp s and their applications as ligands in organometallic complexes are the subject of this article. Other basic bulky Cp s described in the literature, in addition to those sketched above, are di(isobutylXtert-butyl )-Cp (13), penta(isopen-tyl)-Cp [isopentyl = (HjC2)2CH—] (14), and tris(methoxycarbonyl)-Cp (15,16). However, these systems have had very limited application so far,... 

Me02C)4HC5 [tetra(methoxycarbonyl)-Cp], modifications of (Me02C)3H2C3 [tri(methoxycarbonyl)-Cp]... 

Trialkoxy methoxycarbonyl l,2,3-tris(methoxycarbonyl)cyclopropenyl]inethylene -A -phosphanes2 General Procedure ... 

Methyl 2-(trialkoxy-/l -phosphanylidene)-2-[1,2,3-tris(methoxycarbonyl)cycloprop-2-enyl]-acetales rearranged quantitatively on warming the solution from -50 to -10 C for 15-40 minutes to give 2,3,4,5-tetrakis(methoxycarbonyl)trialkoxy-A -phospholes. ... 

Tris(TMS)phosphine reacts with methyl chloroformate under mild conditions to formbis(trimethylsilyl)methoxycarbonylphos-phine and tris(methoxycarbonyl)phosphine (or mixtures thereof) depending on the equivalents of methyl chloroformate used (eq 13). In contrast to acylphosphines 1, which readily undergo a phosphorus to oxygen 1,3-shift of a TMS group, compound 3 is stable and does not isomerize (eq 13). 

Photosensitized reaction of 15c with maleimide 19g at low temperature (-10 to -20°C) affords the exo-[4-1-2]-adduct 16 as a major product, together with the [2-1-2]-adduct 17 (Scheme 11). The same reaction was carried out at room temperature to afford the bis-adduct 27, which was formed via decarboxylation of 16cg followed by addition of another molecule of 19g, in addition to the formation of 17cg. The low-temperature photoreactions of 2-pyrones 15a, 15b with 19g or 19g also gives [4-1-2]-adducts 16ag, 16bg, and [2-1-2]-adduct 17bg. Similar photoreactions of 2-pyrones 15b, 15c with maleic anhydride afford exo-[4-1-2]-adducts (major products) and/or [2-1-2]-adducts. Photosensitized reaction of 15a with dimethyl acetylenedicarboxylate affords 1, 2, 4-tris(methoxycarbonyl)benzene 28 in 50% yield byway of decarboxylation of the [4-1-2]-adduct, which was difficult to isolate even from the reaction mixture obtained from the low-temperature irradiation (Scheme 12)." Similar reactions of 15a with... 

Electron deficient species can attack the unshared electron pairs of heteroatoms, to form ylides, such as in the reaction of thietane with bis(methoxycarbonyl)carbene. The S —C ylide rearranges to 2,2-bis(methoxycarbonyl)thiolane (Section 5.14.3.10.1). A"-Ethoxycar-bonylazepine, however, is attacked by dichlorocarbene at the C=C double bonds, with formation of the trans tris-homo compound (Section 5.16.3.7). 

The N-oxide of l-pyrrolo[2,3-b]pyridine 936 is converted by the combination tri-methylsilylisothiocyanate Me3SiNCS 937/MeOCOCl to 21% 6-isothiocyanato-l-methoxycarbonyl-pyrrolo[2,3-b]pyridine 938 and 18% 6-chloro-l-methoxycarbonyl-pyrrolo[2,3-F]pyridine 939 [51] (Scheme 7.14). To avoid formation of the chloro compound 939 a reagent combination of MesSiNCS 937 with triethylamine or DBU, which lacks any competing chloride ion, might give much higher yields of... 

Similarly, tri-O-benzyl-glucal affords the corresponding manno-configurated methoxycarbonyl cyclopropanes upon treatment with methyl diazoacetate under... 

Die C-Hetarylierung1,2 von Nitro-alkanen gelingt in hohen Ausbeuten mit substituierten 5-Acetyl-2-nitro- und 5-Methoxycarbonyl-2-nitro-furan unter Denitrierung am Furan-System in Kalium-tert.-butanolat/Phosphorsaure-tris-[dimethylamid]1 ... 

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