Organocatalytic synthesis of enantioenriched 1,2,4-triazolines containing a chiral quaternary carbon center
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DOI: 10.1039/c6ra28800f
Abstract: An efficient asymmetric cyclization reaction of amino-acid-derived isothiocyanates with azodicarboxylates is described. The chiral 1,2,4-triazolines are prepared in good yield (up to 87%) and enantioselectivities (up to 95% ee). read more here.
Keywords: containing chiral; synthesis enantioenriched; enantioenriched triazolines; triazolines containing ... See more keywords
Synthesis of pyranopyrazoles with a chiral quaternary carbon stereocenter via copper-catalyzed enantioselective [3 + 3] cycloaddition.
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DOI: 10.1039/d1cc07058d
Abstract: A copper-catalyzed enantioselective [3 + 3] cycloaddition of propargyl carbonates and pyrazolones has been disclosed. This reaction provided an efficient route to synthesize pyranopyrazoles containing a chiral quaternary carbon stereocenter in good yields with good… read more here.
Keywords: carbon stereocenter; enantioselective cycloaddition; chiral quaternary; quaternary carbon ... See more keywords
Regio- and stereoselective syntheses of chiral α-quaternary (Z)-trisubstituted allylic amino acids via synergistic Pd/Cu catalysis.
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DOI: 10.1039/d2cc06820f
Abstract: Synergistic palladium/copper catalysis for asymmetric allylic alkylation of vinylethylene carbonates with aldimine esters has been developed for the synthesis of α-quaternary (Z)-trisubstituted allylic amino acids under mild conditions. This methodology features broad substrate compatibilities in… read more here.
Keywords: quaternary trisubstituted; amino acids; catalysis; allylic amino ... See more keywords