Cyclization vs. Elimination Reactions of 5-Aryl-5-hydroxy 1,3-Diones: One-Pot Synthesis of 2-Aryl-2,3-dihydro-4H-pyran-4-ones
作者:Rasheed Ahmad Khera、Rasheed Ahmad、Ihsan Ullah、Obaid-Ur-Rahman Abid、Olumide Fatunsin、Muhammad Sher、Alexander Villinger、Peter Langer
DOI:10.1002/hlca.201000015
日期:——
step by cyclocondensation of 1,3‐diketone dianions with aldehydes. The use of HCl (10%) for the aqueous workup proved to be very important to avoid elimination reactions of the 5‐aryl‐5‐hydroxy 1,3‐diones formed as intermediates. The TiCl4‐mediated cyclization of a 2‐aryl‐2,3‐dihydro‐4H‐pyran‐4‐one with 1,3‐silyloxybuta‐1,3‐diene resulted in cleavage of the pyranone moiety and formation of a highly functionalized
2-芳基-2,3-二氢-4- ħ -吡喃-4-酮是在一个步骤中通过与醛1,3-二酮酸根环化缩合制备。事实证明,在水溶液处理中使用HCl(10%)对于避免形成中间体的5-芳基-5-羟基1,3-二酮消除反应非常重要。TiCl 4介导的2-芳基-2-3,3-二氢-4 H-吡喃-4-酮与1,3-甲硅烷基氧基丁-1,3-二烯的环化反应导致吡喃酮部分裂解并形成高官能化苯衍生物。