The lipase-catalyzed transesterifications of various substituted diphenyl 1,2-ketals of glycerol have been investigated. Efficient modification of the substrate structure with bis(4-bromophenyl) ketal was found to enhance the enantioselectivity up to E=57 at 0 °C.
Organocatalytic kinetic resolution of racemic primary alcohols using a chiral 1,2-diamine derived from (S)-proline
作者:Dai Terakado、Hitomi Koutaka、Takeshi Oriyama
DOI:10.1016/j.tetasy.2005.01.034
日期:2005.3
A highly efficient and good enantioselective organocatalytic asymmetric acylation of racemic primary alcohols with acyl chlorides has been achieved catalyzed by a chiral 1,2-diamine derived from (S)-proline. (C) 2005 Elsevier Ltd. All rights reserved.
Terao, Yoshiyasu; Tsuji, Keiichiro; Murata, Masakazu, Chemical and pharmaceutical bulletin, 1989, vol. 37, # 6, p. 1653 - 1655
Highly Enantioselective Intermolecular Hydroamination of Allylic Amines with Chiral Aldehydes as Tethering Catalysts
作者:Melissa J. MacDonald、Colin R. Hesp、Derek J. Schipper、Marc Pesant、André M. Beauchemin
DOI:10.1002/chem.201203462
日期:2013.2.18
Chirally LinkedIn: Chiralaldehydes are effective tetheringcatalysts for enantioselectiveintermolecularhydroamination, which provides access to vicinal diamine motifs in good yields and excellent enantioselectivities (see scheme). This work highlights simple chiral α‐oxygenated aldehydes as effective organocatalysts capable of efficiently inducing asymmetry through transient intramolecularity.