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We present a preliminary
measurement of the time-dependent CP-violating asymmetry in
decays of neutral B mesons to the final states D*-+ pi+-
using approximately
178 million BB events recorded by the BaBar experiment
at the PEP-II e+e- storage ring. Events containing these decays
are selected with a partial reconstruction technique, in which only the
high-momentum pi+- from the B decay and the low-momentum
pi-+ from the D*-+ decay are used.
%
We measure the amplitude of the asymmetry to be
$-0.041 \pm 0.016~(stat.) \pm 0.010~(syst.)$
and determine bounds on
$|\sin(2 \beta + \gamma)|$.
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