Walgreen Co. has reshuffled its legal department leadership as it moves forward with the purchase and integration of Alliance Boots GmbH, which runs pharmacies and beauty stores in Europe.Jan Stern Reed was promoted to general counsel from deputy general counsel, and Thomas J. Sabatino Jr. became chief legal and administrative officer, in addition to the secretary role he already held, the Deerfield-based company said Wednesday. Reed joined Walgreens in 2013 from Solo Cup Co., where she had been general counsel since …