From BioStar v2.7.5, Active Directory Synchronization is supported.

Please refer to the link below:

[BioStar 2] How To Configure Activate Directory in BioStar 2

Alternative Solution

If you are looking for a way to simply export users from Active Directory and import them to BioStar 2, you do not need to integrate BioStar with Active Directory. You would have to export the users from Active Directory as a CSV file and import them. 

You can find solutions online to export users out of Active Directory into a CSV file. 

You can import users into BioStar 2 following the steps shown in Knowledgebase below: 

How to export and import users