2?-Nitro-2?-propen-1?-yl 2,2-Dimethylpropanoate (NPP), A Multiple Coupling Reagent
作者:Dieter Seebach、Paul Konchel
DOI:10.1002/hlca.19840670133
日期:1984.2.1
The title compound 1 (NPP) is prepared from formaldehyde, nitromethane, an pivaloyl chloride. It is shown to be a versatile nitroallylating reagent combining with nucleophiles as different as anilines, indoles, enolates, and organolithium compounds. This is documented by ca. 40 examples (2–30). The mechanism of the reaction is discussed. Some examples of addition of two different nucleophiles to the
The invention of new radical chain reactions. part X
作者:Derek H.R. Barton、Hideo Togo、Samir Z. Zard
DOI:10.1016/s0040-4020(01)91351-1
日期:1985.1
oxidised to carboxylic acids by treatment with alkaline hydrogen peroxide. Reductive cleavage to the corresponding aldehydes or ketones is efficiently carried out by the action of TiCl3. Addition of methylmagnesiumiodide to the methyl ketone derived from 3α-acetoxy 11-oxo cholanic acid gives steroid possessing the 25-hydroxycholesterol side chain of the vitamin D3 metabotites. Radical additions to
衍生自硫代异羟肟酸酯的自由基容易加到硝基烯烃(Z = NO 2)中,从而获得高产率的α-亚硝基硫化物。在结构允许的情况下,这些加合物通过用碱性过氧化氢处理很容易被氧化成羧酸。通过TiCl 3的作用,可以有效地进行相应的醛或酮的还原裂解。将甲基碘化镁加到衍生自3α-乙酰氧基11-氧代胆酸的甲基酮中,得到的类固醇具有维生素D 3代谢物的25-羟基胆固醇侧链。简述了对1-苯基硫-2-硝基丙烯的自由基加成反应。
One-Pot Asymmetric Conjugate Addition−Trapping of Zinc Enolates by Activated Electrophiles
The copper-catalyzed asymmetric conjugate addition of dialkyl zinc leads to homochiral zinc enolates. These intermediates were trapped in situ with activated allylic electrophiles, without the need of additional palladium catalysis. High trans selectivity (85/15 to 100/0) and excellent enantioselectivities ( up to 99%) could be attained. The functionalized nature of the electrophiles makes the new synthons potential candidates for further elaboration.
KNOCHEL P.; SEEBACH D., NOUV. J. CHIM., 1981, 5, NO 2, 75-77