Practical Synthesis of 3-Amino-4,5-dimethylisoxazole from 2-Methyl-2-butenenitrile and Acetohydroxamic Acid
摘要:
3-Amino-4,5-dimethylisoxazole was prepared from technical-grade 2-methyl-2-butenenitrile and acetohydroxamic acid in a 62% overall yield on a multimole scale. The key features of this synthesis are (1) DBU treatment of the technical-grade nitrile mixture to provide a starting material of acceptable purity and (2) use of acetohydroxamic acid as an N-protected hydroxylamine equivalent. This operationally simple method provides the title compound in reasonable overall yield and free of contamination from the isomeric 5-amino-3,4-dimethylisoxazole.
Practical Synthesis of 3-Amino-4,5-dimethylisoxazole from 2-Methyl-2-butenenitrile and Acetohydroxamic Acid
摘要:
3-Amino-4,5-dimethylisoxazole was prepared from technical-grade 2-methyl-2-butenenitrile and acetohydroxamic acid in a 62% overall yield on a multimole scale. The key features of this synthesis are (1) DBU treatment of the technical-grade nitrile mixture to provide a starting material of acceptable purity and (2) use of acetohydroxamic acid as an N-protected hydroxylamine equivalent. This operationally simple method provides the title compound in reasonable overall yield and free of contamination from the isomeric 5-amino-3,4-dimethylisoxazole.