1.1- Diethoxy-2-nitro

Nitroacetaldehyde diethyl acetal Ethane, 1,1-diethoxy-2-nitro- (11) (34560-16-2)... [Pg.69]

The nitro-aldol reaction using l,l-diethoxy-2-nitroethane is useful for lengthening of the carbon chain of carbohydrates. The reaction of Eq. 3.86 proceeds in a stereoselective way (ds 75%) to give the syw-nitro alcohol in 58% isolated yield.135 The product is converted into 2-amino-2-deoxyaldoses by reaction with H2/Raney Ni. [Pg.65]

However, this multistep procedure is experimentally complex. A simpler variation described in 199127 consists of the reaction of an aldehyde and a nitro compound in the presence of triethylamine, TBAF and tert-butyl-dimethylsilyl chloride. Under these conditions, nitro sugars are obtained in good yieds and higher diastereoselectivities than those afforded by the standard conditions. This procedure was used in several synthesis of 2-nitro-2-deoxyaldoses, as for the condensation of l,l-diethoxy-2-nitroethane and l,2 3,4-di-0-isopropylidene-a-D-galacto-hexodialdo-l,5-piranose.28 More recently, it was applied to the addition of ethyl nitroacetate to the D-glucose derived aldehyde 18, to give nitro sugar derivatives 26, key precursors of polysubstituted cyclohexane a-amino acids (Scheme 10).29... [Pg.176]

Die Umsetzung von Brom-essigsaure-ethylester mit Natriumnitrit in DMF zu 3,4-Diethoxy-carbonyl-furazan-2-oxid verlauft ebenfalls iiber Nitro-essigsaure-ethylester und das entspre-chende Nitriloxid286 ... [Pg.734]

Analog gelingt es Brom-nitro-methan mit einem Triethoxy-alkan/Zink-Gemisch in Toluol zu 2-Brom-l,l-diethoxy-2-nitro-ethan umzusetzen [Ausbeute 54% Sdp. 100-101°/ lOTorr (1,3 kPa)]. [Pg.188]

Die Umsetzung von l,l-Dichlor-2-nitro-ethen mit Malonsaure-diethylester inalkalischem Medium fiihrt zu 2,4-Diethoxy carbonyl-3-nitromethyl-2-pentendisaure-diethylester (42%)3 ... [Pg.231]

Nitropropanal diethyl acetal Propane, 1,1-diethoxy-3-nitro- (12) (107833-73-8) Triethyl orthoformate Orthoformic acid, triethyl ester (8) Ethane, 1,1, 1"-[methylidynetris(oxy)]tris- (9) (122-51-0)... [Pg.248]

Diethoxy-azobenzene and its dinitro and hexa-nitro derivs see Azo-phenatole 1 A656... [Pg.555]

Methyl-(2-nitro-phenyl)-phosphinsaure-ethylester550 Eine Lbsung von 6,15 g(37,l mmol) 1,2-Dinitro-benzol und 9,20 g (67,6 mmol) Diethoxy-methyl-phosphan in 120 ml Acetonitril wird 20 Stdn. bei 18°belassen. Nach Abziehen des Losungsmittcls wird destilliert Ausbeute 6,50 g (77%) Sdp. 130°/0,0075 Torr (1 Pa). [Pg.208]

Of 2,4-dialkoxypyrimidines, only 2,4di-tert-butoxy pyrimidine19 and 5-nitro-2,4-dimethoxypyrimidine20 failed to react in the normal Hilbert-Johnson fashion, and anomalous O-2-glycosyl derivatives have been obtained21 with a 2,4-dialkoxypyrimidine substituted in position 6, namely, with 2,4-diethoxy-6-meth3dpyrimidine anomeric 2-tetra-0-acetyl-D-glucopyranosyloxy-4-ethoxy-6-methylpyrimidines (18) resulted. Unsuccessful attempts to synthesize an X-l-ribo-furanosyl derivative of orotic acid (uracil-6 carboxylic acid) have been reported.22... [Pg.121]

Essigsaure (a-Diazoacetamino-acetamino)- -ethylester X/4, 521 Pyridazine 5-Amino-3,6-diethoxy-4-nitro- E9a, 613 (H - N02) Pyrimidin 6-Amino-5-(ethoxycarbo-nyl-methyl-amino)-2,4-dihydroxy- E9b/2,145 (N CH 2 — Ar - NH)... [Pg.512]

Furan 2-Aminomethyl-5-(2,4-dioxo-1,2,3,4-tetrahydro-pyrimidino)-2,5-dihydro- IV/lc, 578 Imidazo(l,2-a]pyridin 1,5-Dimethyl-8-nitro-7-oxo-l,2,3,7-tetrahydro-E15/3, 2790 [cycl. (R2N)2C = CH-N02 4- Diketen] 1,3-Oxazol 4-Cyan-5-(diethoxy-methylen-amino)- E4, 565 (Het — NH2 + Orthoester) Pyrazin 3-Amino-2-methoxycarbo-nyl-5-propanoyl- E9b/2, 324 (H - CO-R)... [Pg.626]

Etban 2-Amino-l,l-diethoxy-l-(4-nitro-phenyl)- E14a/1, 769 (R-CH2-CR=N-0-S02-R + R-OH/K)... [Pg.1051]

The kinetics of dehydrohalogenation from the configurational isomers of vinyl halides have been determined for numerous reactions. Thus cw-/7-nitro-P-bromo-styrene in the presence of ethanolic NaOH is converted quantitatively by trans elimination to /7-nitrophenylacetylene within a few minutes (equation 21), whereas the trans isomer hardly reacts at all in that short time. However, the latter affords l,l-diethoxy-2-p-nitrophenylethane in high yield when kept under the above conditions for 20 days (equation 22). The mechanism of the latter reaction could not... [Pg.245]

A successful condensation in a slightly exothermic reaction can be achieved with 34) and 3,3-diethoxy-l-dimethylaminopropenes 35fl-c)6, to the yellow nitro-hexatrienes 36) which cyclize smoothly to form cycloalkenonitrobenzenes 37) on heating in quinoline ... [Pg.152]

Nitropropanal diethyl acetal Propane, 1,1-diethoxy-3-nitro- (107833-73-8), 77, 241... [Pg.322]

Diethoxy-2-methyl-2-nitro-propans8ure-ethylester13 Eine Mischung von 14,7 g (0,10 mol) 2-Nitro-propansaure-ethylester, 29,6 g (0,20 mol) Orthoameisensaure-triethylester und 40,8 g (0,40 mol) Acetanhydrid... [Pg.4]

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