Organocatalytic asymmetric anti-selective Michael reactions of aldehydes and the sequential reduction/lactonization/pauson-khand reaction for the enantioselective synthesis of highly functionalized hydropentalenes

Organic Letters

Volumn 14, Issue 20, 2012, Pages 5346-5349

  Hong, Bor Cherng ^a   Dange, Nitin S ^a   Yen, Po Jen ^a   Lee, Gene Hsiang ^b   Liao, Ju Hsiou ^a  

^a NATIONAL CHUNG CHENG UNIVERSITY   (Taiwan)

^b NATIONAL TAIWAN UNIVERSITY   (Taiwan)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 84867729441     PISSN: 15237060     EISSN: 15237052     Source Type: Journal    
DOI: 10.1021/ol302527z     Document Type: Article

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34. An interesting and creative diastereodivergent asymmetric sulfa-Michael addition of α-branched enones with the choice of acidic additives and reaction media has been reported; however, its detailed reaction mechanism remains unclear; see: Tian, X.; Cassani, C.; Liu, Y.; Moran, A.; Urakawa, A.; Galzerano, P.; Arceo, E.; Melchiorre, P. J. Am. Chem. Soc. 2011, 133, 17934-17941
35. -1, colorless crystal. CCDC-893205, CCDC-893206, CCDC-893207, and CCDC-893208 contain the supplementary crystallographic data for this paper. These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via www.ccdc.cam.ac.uk/data-request/cif.
36. For a recent example of an anti -selective Mannich reaction, see: Gómez-Bengoa, E.; Jiménez, J.; Lapuerta, I.; Mielgo, A.; Oiarbide, M.; Otazo, I.; Velilla, I.; Vera, S.; Palomo, C. Chem. Sci. 2012, 3, 2949-2957