BOSTON—Fashion designer Mossimo Giannulli’s request to serve the remaining three months of his prison term in the college admissions bribery scheme at home was denied Tuesday by a federal judge. Giannulli argued he should be released to home confinement for the rest of his five-month sentence because he spent eight weeks under “extreme” conditions in solitary confinement because of the coronavirus pandemic after reporting to prison in November. But U.S. District Judge Nathaniel Gorton said Giannulli failed to demonstrate an “‘extraordinary and compelling’ reason warranting his release,” though he noted that the quarantine was “longer than anticipated.” An email seeking comment was sent to lawyers for Giannulli. Giannulli, who reported to prison on Nov. 19, believed he would only be held in quarantine for a short time before testing negative for the coronavirus, his lawyers said in court documents. Instead, he spent 56 days isolated in a small cell at …