T. Shinada et K. Yoshihara, STEREOSELECTIVE FUNCTIONALIZATION AT C-9 OF RETINAE - SYNTHESIS OF 9-TRANS-19-NOR-9-HALORETINAL ANALOGS, Chemical and Pharmaceutical Bulletin, 44(1), 1996, pp. 264-266
Stereoselective functionalization at C-9 of retinal based on the use o
f the C-4+X-unit is described. A sequential linkage of C-4+X-units (X=
Cl, Br, and I) with ylide 8 (C-10) and phosphonate 12 (C-5) selectivel
y gave 9-trans-19-nor-9-Cl, Br, and I-retinal derivatives.