bash - Complex command in exec.Command()

Question

I want to exec this command:

docker exec -it demoContainer bash -c "pip freeze" > "requirements.txt"

But don't find any example of this kind of complex commands with pipes, and output writes.

I tryed this:

cmd := exec.Command("docker", "exec -it demoContainer bash -c "pip freeze" > "requirements.txt"")
_, err = cmd.CombinedOutput()

And:

cmd := exec.Command("docker", "exec", "-it", "demoContainer", "bash", "-c", "pip freeze", ">", "scheduleDeploy/requirements.txt")
_, err = cmd.CombinedOutput()

But always crash with the following output:

Error: Exit status 1

Edit

Updates with answers ideas:

err = exec.Command("sh", "-c","'docker exec -it demoContainer bash -c 'pip freeze' > 'requirements.txt''").Run()

Output:

Exit error status 2 

Answer 1

Waitting for answers