Boris N. Yeltsin, the burly provincial politician who became a Soviet-era reformer and later a towering figure of his time as the first freely elected leader of Russia, presiding over the dissolution of the Soviet Union and the demise of the Communist Party, died yesterday in Moscow. He was 76.  His death, at a hospital, came at 3:45 p.m., the Kremlin said, making the announcement without ceremony, a reflection of the contradictory legacy of Mr. Yeltsin’s presidency in the view of many Russians, including his successor, the current leader, President Vladimir V. Putin,” reports The New York Times.