Reaction of azomethines with acyl isocyanates in presence of sulfur dioxide

The reactions of acyl isocyanates with azomethines belong to the class of 1,4-dipolar cycloaddition reactions. Substituted 3-oxo-1,2,4-thiadiazole 1,1-dioxides were obtained as the result of three-component reactions in the presence of SO2. © 1975 Plenum Publishing Corporation

Reaction of acyl isocyanates with pyridine

The trichloroacetyl and trifluoroacetyl isocyanates react with pyridine to give N-(1-pyridinocarbonyl)trichloro(trifluoro)acetyl amidates, while ditrichloro(trifluoro)acetylcarbodiimides are formed in the presence of 3-phenyl-1-ethyl-3-phospholene 1-oxide, which add to the C = N bond of pyridine on the type of 1,4-cycloaddition. © 1977 Plenum Publishing Corporation

Reaction op acyl isocyanates with γ e and α-vinylpyridines

1. Trifluoroacetyl isocyanate reacts with γ-vinylpyridine to give 4-oxo-2-trifluoro-methyl-6-(4-pyridyl)-5,6-dihydro-l,3-oxazine. 2. α-Vinylpyridine reacts with acyl isocyanates as a diene. © 1976 Plenum Publishing Corporation

Reaction of acyl isocyanates with aromatic aldazines

1. Benzoyl and trichloroacetyl isocyanates react with p-dimethylaminobenzalazine and benzalazine on the type of bis-1,3-dipolar cycloaddition to give substituted triazolo[1,2-a]triazoles. 2. Trifluoroacetyl isocyanate reacts with aromatic aldazines on the type of mono-[4+2]-cycloaddition. Trichloroacetyl isocyanate reacts in a similar manner with p-methoxybenzalazine. © 1979 Plenum Publishing Corporation

Synthesis of 2α,3β- and 2β,3β-caranediols

2α,3β- and 2β,3β-caranediols were synthesized by the oxymercuration-demercuration of 3-carene- and 3(7)-caren-2-trans-ols with successive reduction of 3β,4β-epoxycaran-2-one with KBH4, and LiAlH4, respectively. © 1979 Plenum Publishing Corporation

Reaction of acyl isocyanates with pyridine

The trichloroacetyl and trifluoroacetyl isocyanates react with pyridine to give N-(1-pyridinocarbonyl)trichloro(trifluoro)acetyl amidates, while ditrichloro(trifluoro)acetylcarbodiimides are formed in the presence of 3-phenyl-1-ethyl-3-phospholene 1-oxide, which add to the C = N bond of pyridine on the type of 1,4-cycloaddition. © 1977 Plenum Publishing Corporation

Reaction of azomethines with acyl isocyanates in presence of sulfur dioxide

The reactions of acyl isocyanates with azomethines belong to the class of 1,4-dipolar cycloaddition reactions. Substituted 3-oxo-1,2,4-thiadiazole 1,1-dioxides were obtained as the result of three-component reactions in the presence of SO2. © 1975 Plenum Publishing Corporation

Reaction of acyl isocyanates with pyridine

The trichloroacetyl and trifluoroacetyl isocyanates react with pyridine to give N-(1-pyridinocarbonyl)trichloro(trifluoro)acetyl amidates, while ditrichloro(trifluoro)acetylcarbodiimides are formed in the presence of 3-phenyl-1-ethyl-3-phospholene 1-oxide, which add to the C = N bond of pyridine on the type of 1,4-cycloaddition. © 1977 Plenum Publishing Corporation

Reaction of acyl isocyanates with pyridine

The trichloroacetyl and trifluoroacetyl isocyanates react with pyridine to give N-(1-pyridinocarbonyl)trichloro(trifluoro)acetyl amidates, while ditrichloro(trifluoro)acetylcarbodiimides are formed in the presence of 3-phenyl-1-ethyl-3-phospholene 1-oxide, which add to the C = N bond of pyridine on the type of 1,4-cycloaddition. © 1977 Plenum Publishing Corporation

Mechanism of reactions of acyl isocyanates with azomethines

A study of the isomerization of the adducts, and the isolation of the free bipolar ion from the reaction of trichloroacetyl isocyanate with p-dimethylaminobenzalaniline, disclosed that the reaction of acyl isocyanates with azomethines belongs to the type of 1,4-dipolar cycloaddition. © 1977 Plenum Publishing Corporation