A convenient synthesis of 3,4-dihydro-2-methyl-3-oxo-<i>2H</i>-1,4-benzoxazine-2-carboxylic acids and 3,4-dihydro-2-methyl-3-oxo-<i>2H</i>-pyrido[3,2-<i>b</i>]-1, 4-oxazine-2-carboxylic acid
A convenient one pot synthesis of ethyl 3,4-dihydro-2-methyl-3-oxo-2H-1,4-benzoxazine-2-carboxylates and 3,4-dihydro-2-methyl-3-oxo-2H-pyrido[3,2-b]-1,4-oxazine-2-carboxylates and their conversion into the respective carboxylic acids are described.
一种方便的一锅合成乙基的3,4-二氢-2-甲基-3-氧代- 2H -1,4-苯并恶嗪-2-羧酸和3,4-二氢-2-甲基-3-氧代- 2H吡啶并描述了[3,2 - b ] -1,4-恶嗪-2-羧酸酯及其转化为相应的羧酸。