Batch and Flow Synthesis of Pyrrolo[1,2-<i>a</i>]-quinolines via an Allene-Based Reaction Cascade
作者:Marcus Baumann、Ian R. Baxendale
DOI:10.1021/acs.joc.5b01982
日期:2015.11.6
An efficient reaction cascade delivering a series of pyrrolo[1,2-a]quinolines bearing phosphonate or phosphine oxide moieties is presented. This sequence exploits the in situ transformation of propargylic alcohols into transient allenes by means of a strategic [2,3]-sigmatropic rearrangement followed by trapping of the resulting allenes by an adjacent pyrrole ring. Furthermore, the initial small scale
提出了一种有效的反应级联反应,该反应级联反应提供了一系列带有膦酸酯或氧化膦部分的吡咯并[1,2- a ]喹啉。该序列利用策略性的[2,3]-σ重排,然后通过相邻的吡咯环捕获所得的丙二烯,将炔丙醇原位转化为瞬时的丙二烯。此外,最初的小规模分批工艺已成功转化为连续流工艺,可有效制备多克级选定的吡咯并[1,2- a ]喹啉,而无需担心由于反应固有的放热曲线而引起的安全隐患。