Recherches sur la synthese totale des alcaloides appartenant a la serie de la carpaine et de la cassine—II
作者:E. Brown、J. Lavoue、R. Dhal
DOI:10.1016/s0040-4020(01)93317-4
日期:1973.1
The synthesis is described of t-6-propyl-3-piperidinol (dl-pseudo-conhydrine) in 3 steps from 4-4-ethylenedioxy heptanal. This reaction is similar to that recently suggested for the biosynthesis of 2-propylpiperidine (coniine).
Silicon-Controlled Allylation of 1,3-Dioxo Compounds by Use of Allyltrimethylsilane and Ceric Ammonium Nitrate
作者:Jih Ru Hwu、Chung Nan Chen、Shui-Sheng Shiao
DOI:10.1021/jo00109a016
日期:1995.2
A new method was developed for allylation of 1,3-diketones, beta-keto esters, and malonates. Treatment of those 1,3-dioxo compounds with allyltrimethylsilane (1.3 equiv) in the presence of eerie ammonium nitrate (2.1 equiv) in methanol at room temperature often gave the mono-C-allylated products in good to excellent yields (74-98%). These reactions, involving beta-carboradical and beta-carbocationic intermediates, were controlled by a silyl group. Replacement of eerie ammonium nitrate and methanol with manganese(III) acetate (2.4 equiv) and acetic acid afforded silicon-containing dihydrofurans in high yields at 80 degrees C.
Three-step synthetic pathway to fused bicyclic hydantoins involving a selenocyclization step
作者:Biljana M. Šmit、Radoslav Z. Pavlović
DOI:10.1016/j.tet.2014.12.088
日期:2015.2
the synthesis of conformationally constrained fusedbicyclic scaffold. They are assembled by a three-step reaction sequence from two variable building blocks (readily available β-ketoesters and alkenyl halides) by combining a Bucherer–Bergs reaction with a final selenium-promoted intramolecular cyclization as a key step. The chemoselectivity of this bicyclic hydantoin formation is strongly influenced