布朗斯台德酸与原位生成的2-Methide-2 H-吲哚催化环酰胺的[3 + 2]-环加成反应:吲哚[1,2- a ]吲哚的对映选择性合成
摘要:
公开了向吲哚[1,2- a ]吲哚的高度非对映和对映选择性合成的有效形式[3 + 2]-环加成反应。手性BINOL衍生的磷酸催化环烯酰胺的高对映选择性共轭加成反应,使其原位生成2-甲基2 H-吲哚并随后进行醛化,生成带有3个连续氨基酸的乙酰胺取代的吲哚[1,2- a ]吲哚立体定向中心。重要的是,这些产物形成为单一非对映异构体,并具有优异的产率和对映选择性。在环境温度下温和的反应条件,对乙酰氨基基团的轻松除去以及放大的可能性凸显了该方法的实用性。
This work reports a simple and efficient method for the direct phosphorylation of enamide under metal-free conditions. The P-centered radicals, derivedfrom secondary phosphine oxides, are generated under mild reaction conditions in the presence of diphenyliodonium salt and Et3N and are introduced onto a range of enamides in good isolated yields. The method features broad substrate scope, good functional
Palladium-Catalyzed Direct Arylation of Cyclic Enamides with Aryl Silanes by sp2 CH Activation
作者:Hai Zhou、Yun-He Xu、Wan-Jun Chung、Teck-Peng Loh
DOI:10.1002/anie.200901884
日期:——
It does get in! A fluoride‐assisted direct cross‐coupling of cyclic enamides with trialkoxy aryl silanes by a palladium‐catalyzed CH activation leads to a wide range of enamides in yields of up to 95 %.
Direct arylation of cyclic enamides via Pd(ii)-catalyzed C–H activation
作者:Hai Zhou、Wan-Jun Chung、Yun-He Xu、Teck-Peng Loh
DOI:10.1039/b903151k
日期:——
A new direct coupling of cyclic enamides with aryl boronic acids viaPd(II)-catalyzed CâH functionalization has been achieved with good yields (up to 90%).
Enamides were efficiently prepared via a novel Rh/C-catalyzed direct hydroacylation of ketoximes. Up to 88% isolated yield of enamides were obtained with this method. Subsequent asymmetric hydrogenation of the enamides with Rh/DuanPhos complex gave the corresponding chiral amine in excellent enantioselectivities (up to 99.7% ee).
There are disclosed certain compounds identified as N-biphenyl-3-amido substituted benzolactams which promote the release of growth hormone in humans and animals. This property can be utilized to promote the growth of food animals to render the production of edible meat products more efficient, and in humans, to increase the stature of those afflicted with a lack of a normal secretion of natural growth hormone. Growth promoting compositions containing such benzolactams as the active ingredient thereof are also disclosed.