bis(trifluoroacetate) (PIFA) and 2,2,6,6‐tetramethyl piperidin‐1‐oxyl (TEMPO) has been described. This unprecedented transformation features mild reaction conditions, simple execution, high chemo‐ and regio‐selectivity, and thereby provides a facile and efficient protocol for the synthesis of polysubstituted 3,7‐dihydro‐ oxazolo[4,5‐c]pyridine‐2,4,6‐(5H)‐triones.
苯基碘(III)双(三氟乙酸)(PIFA)和2,2,6,6-四甲基哌啶-1-氧基(TEMPO)介导的α -[[(β-氨基)丙烯酰基]-烷基酰胺的新型氧化级联环化已经描述过了。这种前所未有的转化具有温和的反应条件,简单的操作,较高的化学和区域选择性,从而为合成多取代的3,7-二氢恶唑[4,5 - c ]吡啶-2提供了简便而有效的方案, 4,6-(5 H)-三酮。
One-Pot Tandem Double-Aldol Reaction/Aza-Addition of Acetylacetamides and <i>o</i>-Phthalaldehyde Leading to Spiroindan-2,2′-pyrrolidines
作者:Xin Cheng、Fushun Liang、Fan Shi、Lei Zhang、Qun Liu
DOI:10.1021/ol802507y
日期:2009.1.1
A novel domino reaction based on o-phthalaldehyde and 3-oxo-N-arylbutanamide 1 has been developed which allows one-pot and efficient synthesis of structurally complex spiroindan-2,2'-pyrrolidines 2 and 3 with complete regioselectivity and high stereoselectivity from acyclic precursors.