Chiral intermediates useful for the preparation of hydroxyphosphine ligands

摘要

A compound of formula (I), wherein R1 is hydrogen or a hydroxyl protecting group; and R2 and R3 are same or different and are independently selected from halogen or —O—SO2—X; wherein X is —C1-C4 alkyl; C1-C4 alkyl substituted with one or more halogen; or substituted or unsubstituted phenyl wherein said phenyl substituent is selected from halogen, nitro and C1-C4 alkyl; provided that when R3 is bromine, X is not p-toluoyl; and a process for the preparation thereof.

主权项

1. A compound of formula II:wherein:
R1 is hydrogen or Z; R2 and R3 are same or different and are independently selected from F, Cl, Br, I; Z is a hydroxyl protecting group selected from tetrahydro-2H-pyran-2-yl; tetrahydro-2H-pyran-2-one-3-yl; tetrahydro-2H-pyran-2-methoxy-6-yl; tetrahydro-2H-pyran-2-ethoxy-6-yl; Si(t-Bu)Me2; and —C(O)Ph.