The Role Ionic Liquid [BMIM][PF6] in One-Pot Synthesis of Tetrahydropyran Rings through Tandem Barbier–Prins Reaction
作者:Poliane K. Batista、João Marcos G. de O. Ferreira、Fabio P. L. Silva、Mario L. A. A Vasconcellos、Juliana A. Vale
DOI:10.3390/molecules24112084
日期:——
aldehydes. The use of [BMIM][PF6] gave Prins products from several aldehydes in good yields and reaction times. We also found that the anion, PF6-, accelerates the Barbier reaction when used alone, and the excess SnBr2 from the reaction conditions of the Barbier reaction leads to the formation of the THP rings, thus acting as a catalyst for Prinscyclization. Additionally, we demonstrate that ionic
Direct synthesis of tetrahydropyrans via one-pot Babier–Prins cyclization of allylbromide with carbonyl compounds promoted by RTILs BPyX/SnX′2 or BBIMBr/SnBr2
作者:Xian-Liang Zhao、Li Liu、Yong-Jun Chen、Dong Wang
DOI:10.1016/j.tet.2006.04.075
日期:2006.7
Tetrahydropyran compounds can be directly synthesized from allylbromide and carbonyl compounds by means of one-pot Babier-Prins cyclization promoted by BPyX/SnX'(2) or BBINBr/SnBr2 complex (functionalized RTILs) under solvent-free conditions. 2,6-Homo-bissubstituted- and 2,6,6-trisubstituted, especially 6-(spirocycloalkyl)-, tetralrydropyran compounds can be prepared in good yields. (c) 2006 Elsevier Ltd. All rights reserved.