T. Seitz et al., THE SHORTEST WAY TO C-1-SYMMETRICAL, CHIR AL TRIPOD LIGANDS WITH NEOPENTANE BACKBONE, Zeitschrift fur Naturforschung. B, A journal of chemical sciences, 50(7), 1995, pp. 1045-1049
Chiral tripod-ligands of the type 5 are easily accessible in four step
s starting from the dibromide 1. The cleavage of the oxetane 4b by LiP
Ph(2) yielding the tripod-ligand 5 can be modified enantioselectively
by the addition of (-)-sparteine.