N-Fused Indolines through Non-Carbonyl-Stabilized Rhodium Carbenoid CH Insertion of N-Aziridinyl Imines
作者:Stuart J. Mahoney、Eric Fillion
DOI:10.1002/chem.201103155
日期:2012.1.2
Under rhodium catalysis, N‐aziridinyl imines provided access to N‐fused indolines through non‐carbonyl‐stabilized rhodium carbenoid CHinsertion. The utility of this methodology for the synthesis of architecturally complex heterocycles was further demonstrated by an expedient total synthesis of (±)‐cryptaustoline (see scheme).
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]‐ hydrideshift /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