Ligandless Iron-Catalyzed Desulfinylative CâC Allylation Reactions using Grignard Reagents and Alk-2-enesulfonyl Chlorides
作者:Chandra M. R. Volla、Dean MarkovicÌ、Srinivas Reddy Dubbaka、Pierre Vogel
DOI:10.1002/ejoc.200900927
日期:2009.12
regioselectivity of these allylations was studied by using sulfonyl chlorides 3 and 4 with aryl Grignard reagents. The scope of these allylations was further extended by the coupling of ester-substituted alk-2-enesulfonyl chloride 10 with aromatic Grignard reagents. Symmetrical products were synthesized by double C-C allylation with the use of 2-methylidenepropane-1,3-disulfonyl chloride (12). ((C) Wiley-VCH
Alk-2-enesulfonyl chlorides 1-4 是通过 BCl3 促进的烯烃与 SO2 的烯反应合成的。然后将这些磺酰氯用作铁催化脱亚磺酰化交叉偶联反应中的亲电伙伴,与不同的格氏试剂(芳香族、脂肪族和杂芳香族)。该反应甚至可以用 2 mol% 的简单铁盐 Fe(acac)(3) 催化。通过使用磺酰氯 3 和 4 与芳基格氏试剂研究这些烯丙基化的区域选择性。通过酯取代的 2-烯磺酰氯 10 与芳香格氏试剂的偶联,这些烯丙基化的范围进一步扩大。使用 2-亚甲基丙烷-1,3-二磺酰氯 (12) 通过双 CC 烯丙基化合成对称产物。((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany,