Enantioselective Reactions of Donor/Acceptor Carbenoids Derived from α-Aryl-α-Diazoketones
作者:Justin R. Denton、Huw M. L. Davies
DOI:10.1021/ol802614j
日期:2009.2.19
variety of α-aryl-α-diazo ketones with activated olefins, catalyzed by the adamantyl glycine-derived dirhodium complex Rh2(S-PTAD)4, generates cyclopropyl ketones with high diastereoselectivity (up to >95:5 dr) and enantioselectivity (up to 98% ee). Intermolecular C−H functionalization of 1,4-cyclohexadiene by means of carbenoid-induced C−H insertion was also possible with this type of carbenoid.
金刚烷基甘氨酸衍生的铑络合物Rh 2(S -PTAD)4催化多种α-芳基-α-重氮酮与活化烯烃的反应,生成具有高非对映选择性的环丙基酮(高达> 95:5 dr )和对映选择性(最高98%ee)。这种类胡萝卜素也可能通过类胡萝卜素诱导的CH插入而使1,4-环己二烯分子间的CH官能化。
Sequential Rhodium-, Silver-, and Gold-Catalyzed Synthesis of Fused Dihydrofurans
作者:Hengbin Wang、Justin R. Denton、Huw M. L. Davies
DOI:10.1021/ol2016548
日期:2011.8.19
A triple cascade process was developed for the rapid synthesis of polycyclic benzo-fused dihydrofurans. The first step is a rhodium-catalyzedcyclopropanation of α-aryldiazoketones with alkenes. This is followed by a silver-catalyzed ring expansion to dihydrofurans, which then undergo a gold-catalyzed cyclization to form benzo-fused dihydrofurans.