作者:Andrew Beélik、C. B. Purves
DOI:10.1139/v55-164
日期:1955.8.1
structure in kojic acid toward various reagents was investigated. Cleavage to an open-chain, dienol derivative in N sodium hydroxide at 25°, or fragmentation of the structure, was very slow. The benzoyl group in the fifth (phenolic) position of dibenzoylkojic acid was removed by hydroxylamine hydrochloride in pyridine so selectively that the method was of value in synthesizing certain new derivatives. Although
研究了曲酸中环结构对各种试剂的稳定性。在 25° 的 N 氢氧化钠中裂解为开链二烯醇衍生物或结构断裂非常缓慢。盐酸羟胺在吡啶中选择性地去除二苯甲酰曲酸第五(酚)位的苯甲酰基,因此该方法在合成某些新衍生物方面具有价值。虽然催化氢化很容易将曲酸中的吡喃酮环还原为不确定的物质,但冰醋酸中的锌粉将二苯甲酸酯中的羟甲基还原为甲基,并产生苯甲酰异麦芽醇。二苯甲酰曲酸中的环明显打开,保留两个苯甲酰基,通过氨基脲盐酸盐和吡啶产生两种异构体“二氨基脲”,C22H22N6O7,分解,分别为 215° 和 172–173°。用稀酸煮沸时熔点较高的异构体得到化合物 C21H15N3O5,mp 244°,显然是环...