K. Honda et al., HIGHLY Z-SELECTIVE SYNTHESIS OF FUNCTIONALIZED MONOTERPENOIDS VIA N-YLIDE [2,3]SIGMATROPIC REARRANGEMENT AND ITS APPLICATION TO 13-CIS-RETINOL, Chemistry Letters, (8), 1996, pp. 671-672
Highly stereoselective elongation of a functionalized E isoprene unit
on the Z terminal methyl of prenol was achieved by the N-ylide rearran
gement of N-tiglyl-beta-methallyldimethylammonium salt. (E,Z)-Rearrang
ement product was converted into 13-cis-retinol via useful conjugated
triene isoprenoid synthon.