Diastereoselective Spirocyclization via Intramolecular C(
<i>sp</i>
<sup>3</sup>
)−H Bond Functionalization Triggered by Sequential [1,5]‐Hydride Shift/Cyclization Process: Approach to Spiro‐tetrahydroquinolines
作者:Arup Bhowmik、Sumit Das、Writhabrata Sarkar、K. M. Saidalavi、Aniket Mishra、Anupama Roy、Indubhusan Deb
DOI:10.1002/adsc.202001011
日期:2021.2.2
functionalization triggered by sequential [1,5]‐ hydride shift /cyclization sequence using ortho amino benzaldehydes and active methylene compounds such as 2‐coumaranone, 4‐hydroxycoumarin, 3‐coumaranone, and 3‐isochromanone. This protocol provides a Lewis acid catalyst‐free straight forward one‐pot reaction in cases of 2‐coumaranone and 4‐hydroxycoumarin, Lewis acid‐catalyzed stepwise reaction for 3‐coumaranone
通过邻氨基苯甲醛和活性亚甲基化合物等连续的[1,5]-氢化物转移/环化序列引发的C(sp 3)-H键官能化,开发了螺[5.5]和[5.4]-四氢喹啉的直接合成物作为2-香豆酮,4-羟基香豆素,3-香豆酮和3-异苯并二氢吡喃酮。该方案可在2-香豆香酮和4-羟基香豆素的情况下提供无Lewis酸的简单直接反应,而Lewis酸催化的3-香豆香酮和3-isochromanone的逐步反应可在其中使用广泛的螺杂环优异的良率和非对映选择性。