The reaction of
Pd2(dba)3·CHCl3 with 2
equiv
of chiral, C
2-symmetrical cyclopropenes bearing
lactate
esters at the 1- and 2-positions provided
trans-5-palladatricyclo[4.1.0.02,4]heptanes (PTHs) in
high diastereomeric excess. The configuration of all
stereocenters
in the major diastereomer was determined by X-ray
structure analyses of the complexes of the PTH with
norbornadiene; the C
2 symmetry of the (+)-DIOP
complex
of the minor diastereomer proves that this was also a
trans isomer.
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