if (Input.GetButtonDown ("Attack1"))
{
    animator.SetTrigger ("Attack_01");
    StartCoroutine("Attack1");
}

IEnumerator Attack1()
{
    yield return new WaitForSeconds (0.5f);
    attack1 = true;
    yield return null;
    attack1 = false;
}

void OnTriggerEnter2D(Collider2D other)
{
    if (other.tag == "Enemy" && attack == true)
    {
        other.GetComponent<Animator>().SetBool ("Death_bool",true);
        other.GetComponent<Animator>().SetTrigger ("Death");
    }
}