Use of Allenylphosphonates as New Substrates for Phosphane-Catalyzed [3+2] and [4+2] Annulations
作者:Armen Panossian、Nicolas Fleury-Brégeot、Angela Marinetti
DOI:10.1002/ejoc.200800347
日期:2008.8
The suitability of allenylphosphonates as substrates in phosphane-catalyzed annulation reactions has been investigated. Despite their lower reactivity relative to allenyl esters, allenylphosphonates overall display the anticipated behavior: pyrrolines, tetrahydropyridines, and cyclopentenes bearing phosphoryl functions were obtained from imines, α,β-unsaturated esters, and enones in Bu3P- or iBu3P-promoted
已经研究了烯基膦酸酯在膦催化的环化反应中作为底物的适用性。尽管它们相对于丙二烯基酯的反应性较低,但丙二烯基膦酸酯总体上表现出预期的行为:吡咯啉、四氢吡啶和带有磷酰基功能的环戊烯是从 Bu3P 或 iBu3P 促进的反应中的亚胺、α,β-不饱和酯和烯酮中获得的。当膦A2用作手性催化剂时,这些环化反应的对映选择性变体提供高达90%的对映体过量。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)