Ring-opening metathesis of some strained bicyclic systems; stereocontrolled access to diolefinated saturated heterocycles with multiple stereogenic centers
作者:Zsanett Benke、Melinda Nonn、Márton Kardos、Santos Fustero、Loránd Kiss
DOI:10.3762/bjoc.14.247
日期:——
Ring-opening metathesis (ROM) of various unsaturated, constrained bicyclic ring systems has been investigated with the use of commercial ruthenium-based catalysts. Starting from various cyclodienes, the corresponding derived bicyclic lactone, lactam, and isoxazoline derivatives were submitted to ROM under ethenolysis. These functionalized, strained bicyclic systems afforded novel highly-functionalized
Direct Enzymatic Route for the Preparation of Novel Enantiomerically Enriched Hydroxylated β-Amino Ester Stereoisomers
作者:Enikő Forró、László Schönstein、Loránd Kiss、Alberto Vega-Peñaloza、Eusebio Juaristi、Ferenc Fülöp
DOI:10.3390/molecules15063998
日期:——
Enantiomerically enriched hydroxy-substituted beta-amino esters have been synthesized through CAL-B-catalyzed enantioselective hydrolysis in organic media. Moderate to good enantiomeric excess values (ee > or = 52%) were obtained when the CAL-B-catalyzed reactions were performed in t-BuOMe, at 60 degrees C with 0.5 equiv. of added H(2)O as nucleophile.
Selective Synthesis of New Fluorinated Alicyclic β-Amino Ester Stereoisomers
作者:Loránd Kiss、Enikő Forró、Santos Fustero、Ferenc Fülöp
DOI:10.1002/ejoc.201100583
日期:2011.9
cyclohexene or cyclohexane skeleton were prepared from cis- or trans-2-aminocyclohex-3-enecarboxylic acids in five or six steps through a regio- and stereoselective hydroxylation and hydroxy–fluorine exchange. Fluorinated aminoester enantiomers were synthesized from enantiopure cis- or trans-2-aminocyclohexenecarboxylic acid (prepared byenzymatic resolution of the racemic substances).
Selective nitrile oxide dipolar cycloaddition for the synthesis of highly functionalized β-aminocyclohexanecarboxylate stereoisomers
作者:Melinda Nonn、Loránd Kiss、Reijo Sillanpää、Ferenc Fülöp
DOI:10.1016/j.tet.2012.09.085
日期:2012.12
Highly functionalized β-aminocyclohexanecarboxylate regio- and stereoisomers were synthesized from a bicyclic β-lactam by successive regioselective iodolactonization, stereo- and regioselective nitrileoxidecycloaddition, lactone ring-opening and isoxazoline ring-opening.