申请人:Pfaltz Andreas
公开号:US20070149796A1
公开(公告)日:2007-06-28
The invention relates to compounds having a structural element of formula (I) in an aromatic hydrocarbon ring, wherein: M represents —Li, —MgX
3
, (C
1
-C
18
-Alkyl)
3
Sn—, —ZnX
3
or —B(O—C
1
C
4
-Alkyl)
2
; X
1
and X
2
, independent of one another, represent O or N, and C-bound hydrocarbon radicals or heterohydrocarbon radicals are bound to the free bonds of the O and N atoms; group —C═C—, together with C atoms, forms a hydrocarbon aromatic compound and represents X
3
Cl, Br or I. The inventive compounds are easily obtained by directly substituting the hydrogen in the ortho position to the P atom with metalation reagents. The metal atoms can then be substituted by a reactive electrophilic compound. The group —P(X
1
—)(X
2
—) - - - (BH
3
)
0,1
can then be converted into a secondary phosphine group. The inventive method enables the production of monophosphines and diphosphines even on a large scale, which are valuable ligands for metal complexes serving as catalysts for, e.g. enantioselective hydrogenations.