Described herein are neuroactive steroids of the Formula (I):

##STR00001##

or a pharmaceutically acceptable salt thereof; wherein R.sup.1, R.sup.2, R.sup.a, G, X, Y, Z, and n are as defined herein. Such compounds are envisioned, in certain embodiments, to behave as GABA modulators. Also provided are pharmaceutical compositions comprising a compound described herein and methods of use and treatment, e.g., such for inducing sedation and/or anesthesia.

Provided herein are 19-nor C3,3-disubstituted steroids of Formula (I):

##STR00001##

and pharmaceutically acceptable salts thereof; wherein , R.sup.1, R.sup.2, R.sup.3a, R.sup.3b, R.sup.4a, and R.sup.4b are as defined herein, and A is a carbon bound substituted or unsubstituted 5- to 6-membered heteroaryl ring as defined herein. Such compounds are contemplated useful for the prevention and treatment of a variety of CNS-related conditions, for example, treatment of sleep disorders, mood disorders, schizophrenia spectrum disorders, convulsive disorders, disorders of memory and/or cognition, movement disorders, personality disorders, autism spectrum disorders, pain, traumatic brain injury, vascular diseases, substance abuse disorders and/or withdrawal syndromes, and tinnitus.

Provided herein is a compound of Formula (I)

##STR00001##

or a pharmaceutically acceptable salt thereof, wherein R.sup.3a, R.sup.5, R.sup.6a, R.sup.6b, R.sup.17, R.sup.21a, R.sup.21b, R.sup.m, R.sup.n, R.sup.16a, R.sup.16b, R.sup.7a, R.sup.7b, R.sup.12a, R.sup.12b, R.sup.11a, R.sup.11b, R.sup.2a, R.sup.2b, R.sup.19, R.sup.4a, and R.sup.4b are defined herein. Also provided herein are pharmaceutical compositions comprising a compound of Formula (I) and methods of using the compounds, e.g., in the treatment of CNS-related disorders.

Provided herein are 19-nor C3, 3-disubstituted steroids of Formula (I): and pharmaceutically acceptable salts thereof; wherein R.sup.1, R.sup.2, R.sup.3, and R.sup.4 are as defined herein, and A is a heteroaryl ring system comprising 3 or 4 nitrogens as defined herein. Such compounds are contemplated useful for the prevention and treatment of a variety of CNS-related conditions, for example, treatment of sleep disorders, mood disorders, schizophrenia spectrum disorders, convulsive disorders, disorders of memory and/or cognition, movement disorders, personality disorders, autism spectrum disorders, pain, traumatic brain injury, vascular diseases, substance abuse disorders and/or withdrawal syndromes, and tinnitus.

##STR00001##

Provided herein are 3,3-disubstituted 19-nor-steroidal compounds according to Formula (I): ##STR00001##
and pharmaceutical compositions thereof. Such compounds are contemplated useful for the prevention and treatment of a variety of CNS-related conditions, for example, treatment of sleep disorders, mood disorders, schizophrenia spectrum disorders, disorders of memory and/or cognition, movement disorders, personality disorders, autism spectrum disorders, pain, traumatic brain injury, vascular diseases, substance abuse disorders and/or withdrawal syndromes, tinnitus, status epilepticus.

Provided herein is a compound of Formula (I)

##STR00001##

or a pharmaceutically acceptable salt thereof, wherein n, R.sup.19, R.sup.5, R.sup.3a, R.sup.6a, R.sup.6b, R.sup.1, R.sup.2a, R.sup.2b, R.sup.4a, R.sup.4b, R.sup.7a, R.sup.7b, R.sup.11a, R.sup.11b, R.sup.12a, R.sup.12b, R.sup.17b, R.sup.15a, R.sup.15b, R.sup.16a and R.sup.16b are defined herein. Also provided herein are pharmaceutical compositions comprising a compound of Formula (I) and methods of using the compounds, e.g., in the treatment of CNS-related disorders.

Provided herein are 3,3-disubstituted 19-nor-steroidal compounds according to Formula (I) and (III): ##STR00001##
where R.sup.1, R.sup.2, R.sup.3, R.sup.3, R.sup.4, R.sup.6a, R.sup.6a, R.sup.11a, and R.sup.11b are as defined herein. Compounds of the present invention are contemplated useful for the prevention and treatment of a variety of CNS-related conditions, for example, treatment of sleep disorders, mood disorders, insomnia, anxiety, depression, traumatic brain injury (TBI), stress, and epilepsy.

Described herein are neuroactive steroids of the Formula (I): ##STR00001##
or a pharmaceutically acceptable salt thereof; wherein , A, R.sup.1, R.sup.2, and R.sup.3 are as defined herein. Such compounds are envisioned, in certain embodiments, to behave as GABA modulators. The present invention also provides pharmaceutical compositions comprising a compound of the present invention and methods of use, e.g., for treating a subject suffering from a disease or disorder described herein.

Provided herein are 19-nor C3,3-disubstituted steroids of Formula (I): ##STR00001##
and pharmaceutically acceptable salts thereof; wherein , R.sup.1, R.sup.2, R.sup.3a, R.sup.3b, R.sup.4a, and R.sup.4b are as defined herein, and A is a carbon bound substituted or unsubstituted 5- to 6-membered heteroaryl ring as defined herein. Such compounds are contemplated useful for the prevention and treatment of a variety of CNS-related conditions, for example, treatment of sleep disorders, mood disorders, schizophrenia spectrum disorders, convulsive disorders, disorders of memory and/or cognition, movement disorders, personality disorders, autism spectrum disorders, pain, traumatic brain injury, vascular diseases, substance abuse disorders and/or withdrawal syndromes, and tinnitus.

Provided herein are 3,3-disubstituted 19-nor-steroidal compounds according to Formula (I): and pharmaceutical compositions thereof. Such compounds are contemplated useful for the prevention and treatment of a variety of CNS-related conditions, for example, treatment of sleep disorders, mood disorders, schizophrenia spectrum disorders, disorders of memory and/or cognition, movement disorders, personality disorders, autism spectrum disorders, pain, traumatic brain injury, vascular diseases, substance abuse disorders and/or withdrawal syndromes, tinnitus, and status epilepticus. ##STR00001##