BOSTON—Boston Marathon bomber Dzhokhar Tsarnaev is again trying to avoid execution, asking the 1st U.S. Circuit Court of Appeals to consider four constitutional claims not taken up when his death sentence appeal went to the Supreme Court last month. Tsarnaev’s attorneys in a filing Thursday said the trial court “improperly forced” their client to stand trial in Boston; violated his constitutional rights by denying his challenges to two jurors accused of lying during questioning; dismissed a potential juror because of that person’s opposition to the death penalty; and allowed the admission as evidence of what they called Tsarnaev’s “coerced confession.” Thursday’s filing was in response to a Wednesday filing by the appeals court to comply with the Supreme Court’s decision last month to reinstate Tsarnaev’s death penalty. “Because these four claims on direct appeal have not yet been adjudicated by any appellate court, Tsarnaev respectfully submits that the April 6 …