2002
DOI: 10.1002/chem.200390019
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Enantioselective Synthesis of Paraconic Acids

Abstract: The development of a new method for the enantioselective synthesis of disubstituted gamma-butyrolactones is reported. Based on this strategy, the total synthesis of three paraconic acids, that is (-)-roccellaric acid, (-)-nephrosteranic acid and (-)-protopraesorediosic acid, and the formal total synthesis of (-)-methylenolactocin and (-)-protolichesterinic acid is described, which are important because of their antibiotic and antitumor properties. Key steps of the synthesis are copper(I)-catalyzed asymmetric c… Show more

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Cited by 124 publications
(49 citation statements)
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“…40 It turned out that ligand 99 bearing the bulky tBu groups delivered the best results. However, recrystallization of the product furnished the enantiomerically pure cyclopropanation product 112.…”
Section: Furan Cyclopropanationmentioning
confidence: 99%
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“…40 It turned out that ligand 99 bearing the bulky tBu groups delivered the best results. However, recrystallization of the product furnished the enantiomerically pure cyclopropanation product 112.…”
Section: Furan Cyclopropanationmentioning
confidence: 99%
“…65 is already successfully used for the treatment of breast, colon, ovarian and lung cancer in Kazakhstan. 64 was also used as starting material for the total synthesis of paraconic acids, 40 i.e. roccellaric acid (69), 41 nephrosteranic acid (70) and protopraesorediosic acid (71).…”
mentioning
confidence: 99%
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“…Mithilfe einer von uns entwickelten Strategie zur enantioselektiven Synthese von trans-4,5-disubstituierten g-Butyrolactonen [6,7] sollte die Allylierung von Cyclopropancarbaldehyd 4 durch das chirale Allylsilan 5 somit zum ersten wichtigen Zwischenprodukt 3 führen.…”
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