The present invention relates to a synthetic process for the preparation of a
novel class of androgen receptor targeting agents (ARTA) which demonstrate androgenic
and anabolic activity of a nonsteroidal ligand for the androgen receptor. The agents
define a new subclass of compounds which are selective androgen receptor modulators
(SARM) which are useful for a) male contraception; b) treatment of a variety of
hormone-related conditions, for example conditions associated with Androgen Decline
in Aging Male (ADAM), such as fatigue, depression, decreased libido, sexual dysfunction,
erectile dysfunction, hypogonadism, osteoporosis, hair loss, anemia, obesity, sarcopenia,
osteopenia, osteoporosis, benign prostate hyperplasia, alterations in mood and
cognition and prostate cancer; c) treatment of conditions associated with Androgen
Decline in Female (ADIF), such as sexual dysfunction, decreased sexual libido,
hypogonadism, sarcopenia, osteopenia, osteoporosis, alterations in cognition and
mood, depression, anemia, hair loss, obesity, endometriosis, breast cancer, uterine
cancer and ovarian cancer; d) treatment and/or prevention of chronic muscular wasting;
e) decreasing the incidence of, halting or causing a regression of prostate cancer;
f) oral androgen relacement and/or other clinical therpauetic and/or diagnostic
areas. The process of the present invention is suitable for large-scale preparation,
since all of the steps give rise to highly pure compounds, thus avoiding complicated
purification procedures which ultimately lower the yield. Thus the present invention
provides methods for the synthesis of non-steroidal agonist compounds, that can
be used for industrial large-scale synthesis, and that provide highly pure products
in high yield.