I recall from reading Phillipe Sands East West Street that Raphael Lemkin (who would later term the word Genocide) drew paralells between the Armenian Genocide and the disenfranchisment of Jews in Germany starting in '33, going so far as predicting the mass murder to come (or at least seeing the real danger).
However I don't have access to the book right now. I'm not sure my memory is correct, and totally unsure when exactly Lemkin made this prediction, if at all. Both Wikipedia articles I can read on him don't state explicitly what he said or wrote before the outbreak of the war about antisemitism and it's possible consequences in Germany.
This question is in part prompted by reading David Cesaranis The Fate of the European Jews, as Cesarani quotes many German Jews who did not see their lives in danger in the pre-war years.