An Efficient One-Pot Synthesis of Substituted 1H-Naphtho[2,1-b]pyrans and 4H-1-Benzopyrans (=Chromenes) under Solvent-Free Microwave-Irradiation Conditions
作者:Adimulam Chandra Shekhar、Akula Ravi Kumar、Gangaram Sathaiah、Kengiri Raju、Pamulaparthy Shanthan Rao、Madabhushi Sridhar、Banda Narsaiah、Punnamraju Venkata Satya Surya Srinivas、Balasubramanian Sridhar
DOI:10.1002/hlca.201100332
日期:2012.3
heterogeneous synthesis of 3‐amino‐1‐aryl‐1H‐naphtho[2,1‐b]pyran and 2‐amino‐4‐aryl‐4H‐1‐benzopyran derivatives 3 and 5, respectively, was carried out efficiently by one‐pot three‐component coupling of an aromatic aldehyde 1, an active methylene compound 2, and naphthalen‐2‐ol or a phenol 4 in the presence of 5‐Å molecular sieves under solvent‐free microwave‐irradiation conditions (Scheme 1 and 2, Tables 1
3-氨基-1-芳基- 1的一种简便多相合成ħ -萘并[2,1- b ]吡喃和2-氨基-4-芳基-4- ħ -1-苯并吡喃衍生物3和5,分别进行在无溶剂微波辐射条件下,在5Å分子筛的存在下,通过芳族醛1,活性亚甲基化合物2和萘-2-醇或苯酚4的单锅三组分偶联有效地进行(方案1和2,表1和2)。回收催化剂并再循环(表3)。