Synthesis of Acetyl and Iodo Derivatives of 4-Hydroxy-6-phenyl-<i>6H</i>-pyrano[3,2-<i>c</i>]pyridine-2,5-diones and 4-Hydroxy-1-phenylpyridin-2(1<i>H</i>)-ones
作者:B. P. Nikam、T. Kappe
DOI:10.1002/jhet.2619
日期:2017.1
described for the synthesis of acetyl and iodo derivatives of 4‐hydroxy‐6‐phenyl‐6H‐pyrano[3,2‐c]pyridine‐2,5‐diones 1 and 4‐hydroxy‐1‐phenylpyridin‐2(1H)‐ones 5. Compounds 1 with phenyl and alkyl substituent at C(7) and C(8), respectively, can be easily acetylated by refluxing in a mixture of acetic acid and polyphosphoric acid to give 3‐acetyl‐4‐hydroxy‐6‐phenyl‐6H‐pyrano[3,2‐c]pyridine‐2,5‐diones 2 in
已经描述了一种简单有效的方法来合成4-羟基-6-苯基-6H-吡喃并[3,2 - c ]吡啶-2,5-二酮1和4-羟基-1-的乙酰基和碘代衍生物。苯基吡啶-2-(1 H)-酮5。分别在C(7)和C(8)处带有苯基和烷基取代基的化合物1可以通过在乙酸和多磷酸的混合物中回流而轻易地被乙酰化,得到3-乙酰基-4-羟基-6-6苯基-6 H-吡喃并[3,2 - c ]吡啶-2,5-二酮2具有极好的收率。化合物1和5可用碘和无水碳酸钠在沸腾的二恶烷中碘化,得到4-羟基-3-碘-6-2-苯基-6H-吡喃[3,2 - c ]吡啶-2,5-二酮3和4-羟基-3碘-1-苯基吡啶2(1 H)-6分别以高收率存在。使用红外,核磁共振和元素分析确定了结构。