Journal
TETRAHEDRON
Volume 69, Issue 16, Pages 3486-3494Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2013.02.045
Keywords
Itaconyl camphorsultam; Crabtree's catalyst; Conjugate reduction; Tributyltin hydride; Lewis acid; Solvent effect
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The catalytic hydrogenation of 4-methyl itaconate derivatives bearing a chiral auxiliary and their conjugate reduction with n-Bu3SnH in the presence of Lewis acid were examined to reveal their diastereoselectivity. The homogeneous catalytic hydrogenation of 4-methyl itaconyl (1S)-(-)-2,10-camphorsultam with the Crabtree's catalyst [Ir(COD)(PCy3)(py)]PF6 in CH2Cl2-MeOH (2:1 v/v) gave less polar (1S,2'S)-diastereomer in 84% yield, while the conjugate reduction of the alpha-methylene amide with n-Bu3SnH (2 equiv) using MgI2 (7 equiv) as an additive in CH2Cl2 gave more polar (1S,2'R)-diastereomer in 70% yield. (C) 2013 Elsevier Ltd. All rights reserved.
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