An accounting fraud case at a once-prominent New York law firm that captured front-page headlines in 2014 is now looking more ordinary.

On Friday, a New York State Supreme Court judge threw out all the grand larceny charges against the two remaining defendants stemming from the collapse of the law firm, Dewey & LeBoeuf, in 2012.

The decision means prosecutors intend to go to trial this year against the two, Joel Sanders and Stephen DiCarmine, with just a few criminal charges — none of them the most serious offenses originally charged by prosecutors in Manhattan nearly two years ago.

“We are very gratified by the court’s decision,” said Andrew J. Frisch, a lawyer for Mr. Sanders.

The latest whittling down of the criminal case is another blow to Cyrus R. Vance Jr., the Manhattan district attorney, in one of the most notable white-collar cases filed by his office.