Asymmetric catalysis of Diels–Alder cycloaddition by a β-amino alcohol derived boron complex: reasonable transition-state assembly for one-directional diene approach
Asymmetric hetero Diels–Alder reaction of Danishefsky's dienes and glyoxylates with chiral bis(oxazolinyl)phenylrhodium(III) aqua complexes, and its mechanistic studies
Asymmetric heteroDiels–Alderreaction of Danishefsky'sdienes with glyoxylates is catalyzed in high enantioselectivity and cis (endo)-diastereoselectivity by chiral (Phebox)RhCl2(H2O) complexes [Phebox=2,6-bis(oxazolinyl)phenyl], via the concerted [4+2] mechanism with perpendicular conformation of two carbonyl moieties of glyoxylates. Dibromide and difluoride complexes were newly synthesized and found
Asymmetric Hetero-Diels–Alder Reaction of Danishefsky’s Dienes with α-Carbonyl Esters Catalyzed by an Indium(III)–PyBox Complex
作者:Bei Zhao、Teck-Peng Loh
DOI:10.1021/ol400841s
日期:2013.6.21
An efficient catalytic enantioselective hetero-Diels–Alderreaction of Danishefsky’s dienes with α-carbonyl esters using a chiral In(III)–pybox complex has been demonstrated. This protocol offers several advantages, including mildreaction conditions, relatively low catalyst loading, and good to excellent enantioselectivities. Furthermore, the absolute configurations of the new alkynyl-containing products
Asymmetric hetero Diels-Alder reactions of Danishefsky's diene and glyoxylate esters catalyzed by chiral bisoxazoline derived catalysts
作者:Arun K. Ghosh、Packiarajan Mathivanan、John Cappiello、K. Krishnan
DOI:10.1016/0957-4166(96)00261-3
日期:1996.8
AsymmetricheteroDiels-Alderreactions of Danishefsky's diene and glyoxylate esters catalyzed by bis(oxazoline)-metal complex afforded the corresponding aldol adduct which upon treatment with trifluoroacetic acid furnished the heteroDiels-Alder product in 72% enantiomeric excess and 70% isolated yield.