Synthesis of Enantiomerically Pure Morphine Alkaloids: The Hydrophenanthrene Route
作者:Dirk Trauner、Jan W. Bats、Andreas Werner、Johann Mulzer
DOI:10.1021/jo9805394
日期:1998.8.1
A concise, linear, total synthesis of (-)-dihydrocodeinone-a close synthetic precursor of (-)-codeine and (-)-morphine-has been achieved. The carbocyclic core of the alkaloid was provided in the form of a phenanthrenone, which was resolved by chromatography on cellulose triacetate. A cuprate conjugateaddition was used to establish the crucial benzylic quaternary stereocenter and to introduce the C(2)-side
In this report, a generalmethod for the preparation of 1,5-dicarbonyl compounds and six membered ring annelation is described. This method involves the reaction of hemiacetal vinylogs 1 with enol ethers 2 or 3 in the presence of a Lewis acid. This reaction was successfully applied to the enol ethers of α and α,α'-hindered ketones such as 2,2,6-trimethyl cyclohexanone. α-Cyperone and 6-epi-α-cyperone
One-pot synthesis of Robinson annulated 3-aryl-cyclohexenones from allyl alcohols and ketones using palladium is reported. Long chain aliphatic or aryl substitutions at the C1 position of allyl alcohol result in the formation of 1,5-diketone products. This simple one-pot method avoids the use of highly electrophilic vinyl ketones.
LOW MOLECULAR WEIGHT MODULATORS OF THE COLD MENTHOL RECEPTOR TRPM8 AND USE THEREOF
申请人:BASF SE
公开号:US20170265510A1
公开(公告)日:2017-09-21
The invention relates to new types of modulators of the cold menthol receptor TRPM8, to methods of modulating the TRPM8 receptor using these modulators; and in particular the use of the modulators for inducing a sensation of coldness; and also the articles and compositions produced using these modulators.
Use of the Bifunctional Reagent (<i>Z</i>)-4-Iodo-1-(tributylstannyl)but-1-ene: A New Cyclohexenone Annulation Method
作者:Edward Piers、Serge L. Boulet
DOI:10.1055/s-1998-1707
日期:1998.5
A new cyclohexenone annulation method, based on the use of the bifunctional reagent (Z)-4-iodo-1-(tributylstannyl)but-1-ene (6) and exemplified by conversion of the substrate 8 into the annulated products 13 and 18 and of the starting materials 19-23 into the products 34-38, respectively, is described.