1.3- Oxazolidine

Intramolecular reaction of the allenyl carbamate 5 in the presence of a large excess of allylic chloride catalyzed by Pdi(dba)3 or PdCl2(PhCN)2 affords the substituted oxazolidin-2-one 6. Since the reaction is catalyzed by both Pd(II) and Pd(0), its mechanism is not dear[3]. [Pg.450]

Thermolysis of the aziridine (446) in the presence of diphenylketene gave a mixture of the pyrrolidone (447 minor product) and the oxazolidine (448 major product). In this instance the preferential addition to the C=0 bond is explained in terms of steric effects (72CC199). Similar addition to diphenylacetaldehyde takes place with the same orientation and the oxazolidine (448a) was obtained. When the reaction of the aziridine with the aldehyde was carried out in the presence of hydrogen selenide a selenazolidine was obtained (72BSB295). [Pg.154]

Aroylaziridines (32) and aromatic aldehydes react to give oxazolidines (33), the stereochemistry of which suggests reaction very largely through the trans-azomethine ylide, irrespective of the aziridine configuration (70JCS(C)2383). [Pg.54]

Oxazolidine, cis-4-methyl-5-phenyl- C NMR, S, 20 (79MI40100) Oxazolidine-2-thione IR, S, 26 (63PMH(2)161)... [Pg.38]

Oxazolidine-4,5-dione, At-benzoyl-synthesis, 6, 231 Oxazolidinediones reactions, 6, 214 structure, 6, 179 Oxazolidine-2,4-diones as anticonvulsants, 1, 166 NMI 6, 181 reactions, 6, 214 s mthesis, 6, 231 OxazoIidine-2,5-diones crystal structure, 6, 185 reactions, 6, 214 polymers, 1, 307 s mthesis, 6, 231 Oxazolidine-4,5-diones synthesis, 6, 231 Oxazolidines... [Pg.728]

Oxazolidin-5-one, bis(trifluoromethyl)-reactions, 6, 213 Oxazolidinones polymers, 1, 281-282 reactions, 6, 213 Oxazolidinones, imino-rearrangement, 5, 775 Oxazolidinones, vinyl-polymers, 1, 281 Oxazolidin-2-ones circular dichroism, 6, 185 H NMR, 6, 181 IR spectroscopy, 6, 183 PE spectroscopy, 6, 183 reactions, 6, 213... [Pg.729]

Pyrrolidino[l,2-6][l,3,4]oxadiazoline, 5-phenyl-biological activity, 6, 1024 Pyrrolidino[2,1 -6][1,3]oxazolidines synthesis, 5, 137 Pyrrolidino[l,2-6]pyrazolines synthesis, 5, 148... [Pg.821]

LiBF4, wet CH3CN, 96% yield.Unsubstituted 1,3-dioxolanes are hydrolyzed only slowly, but substituted dioxolanes are completely stable.This reagent proved excellent for hydrolysis of the dimethyl ketal in the presence of the acid-sensitive oxazolidine. ... [Pg.180]

An oxazolidine was used to protect the carbonyl group in an a,/3-unsaturated aldehyde during reduction of the carbon-carbon double bond by H2/Raney Ni. It... [Pg.217]

Oxazolidines are prepared to allow selective protection of the ct- or aj-C02H groups in aspartic and glutamic acids. [Pg.266]

Several blocked diamines or amino-alcohols are commercially available. The aldimine is an aldehyde-blocked diamine. The ketimine is a ketone-blocked diamine. The oxazolidine is a five-membered ring containing oxygen and nitrogen. The oxazolidine ring shown below is an aldehyde-blocked amino alcohol. The basic synthetic concepts of an aldimine, a ketimine, and an oxazolidine are shown below ... [Pg.799]

The 2,2-bis(tnfluoromethyl)-4-methyl-2f/-5-oxazolone, readily available from 2,2-bis(trifluoromethyl)-l,3-oxazolidin-5-one, is a synthetic equivalent of activated pyruvate [90] (equation 16). [Pg.847]

Similarly, trimethylsilyl inflate can be used as a catalyst for the alkylation of 2 methoxy 1,3-oxazolidines [104] or 1-acetoxyadamantane [105] with allylsilane and for the reduction of acetals to ethers with trialkylsilanes [106]... [Pg.961]

The previous sections have dealt with stable C=N-I- functionality in aromatic rings as simple salts. Another class of iminium salt reactions can be found where the iminium salt is only an intermediate. The purpose of this section is to point out these reactions even though they do not show any striking differences in their reactivity from stable iminium salts. Such intermediates arise from a-chloroamines (133-135), isomerization of oxazolidines (136), reduction of a-aminoketones by the Clemmensen method (137-139), reductive alkylation by the Leuckart-Wallach (140-141) or Clarke-Eschweiler reaction (142), mercuric acetate oxidation of amines (46,93), and in reactions such as ketene with enamines (143). [Pg.201]

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