Microwave‐Assisted Elimination Reaction of <i>trans</i>‐4‐(4‐Fluorophenyl)‐3‐chloromethyl‐1‐methylpiperidine on Alumina
作者:Hana Navrátilová、Zdeněk Kříž、Milan Potáček
DOI:10.1081/scc-120037925
日期:2004.12.31
Abstract trans‐4‐(4‐Fluorophenyl)‐3‐chloromethyl‐1‐methylpiperidine 3b was subjected to elimination reaction on alumina or KF‐alumina under solvent‐free conditions and microwave irradiation. Compared with the “classical” method of heating in the presence of an organic base, the microwave‐assisted methodology provided higher yields of 4‐(4‐fluorophenyl)‐3‐methylene‐1‐methylpiperidine 7b (65.5–71%) in
摘要 在无溶剂条件和微波照射下,反式-4-(4-氟苯基)-3-氯甲基-1-甲基哌啶3b在氧化铝或KF-氧化铝上发生消除反应。与在有机碱存在下加热的“经典”方法相比,微波辅助方法可提供更高产率的 4-(4-氟苯基)-3-亚甲基-1-甲基哌啶 7b (65.5-71%)更短的反应时间(20-40 分钟)。此外,7b 中的环外双键重排为环内双键,得到化合物 8。研究了氧化铝和辐照时间对反应转化率和异构化程度的影响。