Ja. Marshall et al., SYNTHESIS OF SYN,SYN ANTI,SYN SYN,ANTI AND ANTI,ANTI STEREOTRIADS FROM A SINGLE PAIR OF ENANTIOMERIC REAGENTS, Journal of organic chemistry, 60(17), 1995, pp. 5556-5559
The stannanes (S)-1a, (R)-1b, and (S)-1c add to (S)- and (R)-2-methyl-
3-(benzyloxy)propanal ((S)-2 and (R)-2) to afford the syn,syn (BF3 . O
Et(2) promotion), syn,anti (MgBr2 . OEt(2) promotion), anti,anti (SnCl
4-derived reagent in CH2Cl2), and anti,syn (SnCl4-derived reagent in h
exane) stereotriad adducts 3, 4, 6, and 7.