Matt Hudson-Smith from Great Britain retains the title
Hudson-Smith moved away from the field in the final 100m to ensure he completed his three significant medals this summer with gold in 44.53 seconds.
The 27-year-old won world bronze in Eugene in July and claimed Commonwealth Games silver in Birmingham 10 days ago.
Haydock-Wilson, 23, clocked 45.17.
Switzerland's Ricky Petrucciani posted a season-best performance of 45.03 to take silver at the Olympiastadion.
In the women's event, Victoria Ohuruogu fell short of collecting another medal in her excellent season.
The 29-year-old Commonwealth silver medallist had set a new personal best of 50.50 seconds in qualifying - and though she clocked 50.51 in the final, it was not enough to make the podium.
The Netherlands’ Femke Bol, bidding to win a 400m and 400m hurdles double in Munich, claimed victory in 49.44, with Poland's Natalia Kaczmarek (49.94) and Anna Kielbasinska (50.29) taking silver and bronze, respectively.
Ireland's Rhasidat Adeleke set a new national recordin 50.53 as she placed fifth.
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