Reductive Reformatsky-Honda Reaction of α,β-Unsaturated Esters: Facile Formation of 1,3-Dicarbonyl Compounds and β-Hydroxy Esters
作者:Kazuyuki Sato、Motoyuki Isoda、Shizuka Ohata、Shuhei Morita、Atsushi Tarui、Masaaki Omote、Itsumaro Kumadaki、Akira Ando
DOI:10.1002/adsc.201100463
日期:2012.2
The reaction of tris(triphenylphosphine)rhodium chloride [RhCl(PPh3)3] with diethylzinc (Et2Zn) easily afforded a rhodium-hydride complex that effects the 1,4-reduction of α,β-unsaturated esters to give rhodium enolates. Formation of the rhodium enolate is followed by transmetalation with the zinc species to give a Reformatsky-type reagent, and this reacts with various acid chlorides at the α-position
三(三苯基膦)氯化铑[RhCl(PPh 3)3 ]与二乙基锌(Et 2 Zn)的反应容易得到氢化铑络合物,该络合物可实现α,β-不饱和酯的1,4-还原,从而得到烯醇铑。 。形成烯醇铑后,与锌物种进行金属转移以形成Reformatsky型试剂,该试剂在α位与各种酰氯反应生成β-酮酸酯。Reformatsky型试剂还可以与各种亲电子试剂(如醛,酮和酸酐)反应,得到相应的产物,其中亲电试剂在α,β-不饱和酯的α-位被还原性引入。