Palladium-Catalyzed Reactions of Hypophosphorous Compounds with Allenes, Dienes, and Allylic Electrophiles: Methodology for the Synthesis of Allylic <i>H</i>-Phosphinates
作者:Karla Bravo-Altamirano、Isabelle Abrunhosa-Thomas、Jean-Luc Montchamp
DOI:10.1021/jo702542a
日期:2008.3.1
phosphinate, which then led to the development of a Pd-catalyzed rearrangement of preformed allylic phosphinates esters and, ultimately, to a catalytic dehydrative allylation of hypophosphorous acid with allylic alcohols. The reactions disclosed herein constitute efficient synthetic approaches, not only to prepare allylic H-phosphinic acids but also their esters via one-pot tandem processes. In addition
次磷化合物 (MOP(O)H 2 , M = H, R 3 NH) 在温和条件下有效地参与金属催化的丙二烯、二烯和活化烯丙基亲电试剂的 C-P 键形成反应。催化系统 Pd 2 dba 3 /xantphos 对于避免或最小化次磷酸衍生物可用的竞争性还原转移-氢化途径至关重要。对烯丙基化机制的进一步研究提供了类似的乙酸烯丙酯-烯丙基次膦酸酯,然后导致了预先形成的烯丙基次膦酸酯的 Pd 催化重排的发展,并最终导致次磷酸与烯丙醇的催化脱水烯丙基化。本文公开的反应构成了有效的合成方法,不仅通过一锅串联法制备烯丙基H-次膦酸而且制备它们的酯。此外,还证明了H-次膦酸盐作为用于制备其他有机磷化合物的有用合成子的潜力。