Timeline
In 1982, Buchwald wrote a screen treatment that was pitched to Jeffrey Katzenberg of Paramount, with the intention of starring Eddie Murphy, who was under contract to Paramount at the time. Paramount optioned the treatment in early 1983 and commissioned several unsuccessful scripts from several screenwriters. John Landis was considered as the director from time to time. After two years of development hell, Paramount decided to abandon the project in March 1985.
In May 1986, Paramount's rival Warner Bros. optioned Buchwald's treatment.
In the summer of 1987, Paramount began to develop a movie that was credited as being based on a story by Eddie Murphy, and which was to be directed by John Landis. The story outline was similar to Buchwald's story idea, and to the failed Paramount scripts that had been based on it.
In January 1988, Warner Bros. canceled their version of Buchwald's project, citing the Paramount project.
When the movie Coming to America was released by Paramount in 1988, Eddie Murphy was given sole story credit. Buchwald was not paid, or even credited as the story writer. Buchwald sued Paramount for breach of contract, as his contract with Paramount stated that he would be paid a certain amount if his treatment were made into a film.
Read more about this topic: Buchwald V. Paramount