Pyrazolo[1,5-a]pyrimidine derivatives as mTOR inhibitors

1. A method of treating a disease by inhibiting a mTOR, comprising administering to a patient in need of such treatment

an amount of a first compound represented by the structural Formula I:

or a pharmaceutically acceptable salt, or ester thereof,

wherein:

R is independently selected from the group consisting of halo, hydroxyl, amino, —CN, H, —(C 1 -C 6 )alkyl, alkoxy, —C(═O)alkyl, heteroaryl and aryl, wherein each of said heteroaryl and aryl can be unsubstituted or substituted with one or more alkyl or halo;

R 1 is independently selected from the group consisting of heterocycloalkyl, spiroheterocycloalkyl, heterocyclenyl, —NR 3 R 4 , cycloalkyl, heteroaryl, aryl, alkynyl, heterocyclenylalkyl, cycloalkylalkyl, heteroarylalkyl, heteroarylalkynyl, —N-heteroaryl, and arylalkyl, wherein each of said heterocycloalkyl, spiroheterocycloalkyl, heterocyclenyl, cycloalkyl, heteroaryl, aryl, alkynyl, heterocyclenylalkyl, cycloalkylalkyl, heteroarylalkyl, heteroarylalkynyl, —N-heteroaryl and arylalkyl can be unsubstituted or substituted with one or moieties independently selected from the group X;

X is alkoxyl, alkyl, —C(O)alkyl, —C(O)-hydroxyalkyl, —C(O) 2 alkyl, —C(O) 2 H, hydroxyalkyl, —S(O) 2 alkyl, hydroxyl, heterocycloalkyl, —NH-heterocycloalkyl, -trihaloalkyl, -dihaloalkyl, -monohaloalkyl, —N—S(O) 2 -alkyl, —C(O)-heteroaryl, -alkyl-C(O) 2 H, -alkyl(CO)N(CH 3 )—O—CH 3 , -alkyl(CO)-heteroaryl, —C(O) 2 -alkyl, -alkyl-C(O)—NH 2 , —NH 2 , heteroaryl, -alkyl-CN, —C(O) 2 -arylalkyl, halo, carboxyesteralkyl, —C(O)—NH 2 , -alkyl-C(O) 2 alkyl, heteroarylalkyl, —C(O)-heteroaryl, —C(O)-alkyl-O-alkyl, -alkyl(CO)NS(O) 2 -cycloalkyl, -alkyl(CO)N—S(O) 2 —CF 3 , —N-alkyl, —SO 2 -cycloalkyl, -alkyl(CO)NS(O) 2 -alkyl, -alkyl-C(O)—N(alkyl) 2 , -alkyl-NS(O) 2 -alkyl, alkyl(CO)NS(O) 2 -cycloalkyl, —CO—CO 2 H, —C(O) 2 -alkyl-aryl, —SO 2 —CF 3 or —C(O)H, wherein each of said heterocycloalkyl, heteroaryl or —C(O)-heteroaryl can be unsubstituted or substituted with one or more alkyl;

R 2 is pyridyl optionally substituted with one or more moieties independently selected from the group consisting of alkyl, alkoxyl, —CN, aryloxyl, aryl, halo, hydroxyl, —C(CH 3 ) 2 CN, trifluoromethyl, difluoromethyl, monofluoromethyl, heterocycloalkyl, and arylalkyl;

R 3 is cycloalkyl or heteroaryl, wherein each of said cycloalkyl or heteroaryl can be unsubstituted or substituted with one or more moieties independently selected from the group consisting of X; and

R 4 is H;

and optionally an amount of at least one second compound, said second compound being an anti-cancer agent;

wherein the amounts of the first compound and said second compound result in a therapeutic effect.

2. The method according to claim 1 , wherein the one or more anti-cancer agents are selected from the group consisting of Adriamycin, Altretamine, Amidox, Aminoglutethimide, Amsacrine, Anastrazole, Antibodies to EGFR, 3-AP, Aphidicolon, Ara-C, Arsenic trioxide, L-Asparaginase, Bevacizumab, Bleomycin, BMS 214662, Bortezomib, Busulfan, Campath, Camptostar, Capecitabine, Carboplatin, Carmustine, Centrosome associated protein E (“CENP-E”) inhibitors, Cetuximab, Cladribine, Chlorambucil, Chlormethine, Chlorotrianisene, Cisplatin, Clofarabine, cyclophosphamide, Cytarabine, a Cytostatic agent, Cytoxan, Dacarbazine, Dactinomycin, Daunorubicin, Dasatinib, Deforolimus, Deoxycoformycin, Didox, Diethylstilbestrol, Docetaxel, Doxorubicin, Dromostanolone, Droloxafine, Epirubicin, Epothilone, ERK inhibitors, Erlotinib, Etoposide, 17α-Ethinylestradiol, Estramustine, Exemestane, Floxuridine, Fludarabine, Fludarabine phosphate, 5-Fluorouracil, Fluoxymesterone, Flutamide, Fulvestrant, Gefitinib, Gemcitabine, Gemtuzumab ozogamcicin, Goserelin, GSK-923295, Hexamethylmelamine, Hydroxyprogesterone, Hydroxyurea, Ibritumomab Tiuxetan, Idarubicin, Ifosfamide, Imatinib mesylate, Intron, Irinotecan, ispinesib, KSP inhibitors, L778,123, Lapatinib, Leucovirin, Leuprolide, Lerozole, Letrazole, Levamisole, Liposomal Doxorubicin, Liposomal, Lomustine, Lonafarnib, Medroxyprogesteroneacetate, Megestrolacetate, Melphalan, 6-Mercaptopurine, Methoxtrexate, Methylprednisolone, Methyltestosterone, Mithramycin, Mitomycin-C, Mitotane, Mitoxantrone, Navelbene, Nilotinib, Oxaliplatin, Paclitaxel, Panitubimab, Pentostatin, Pipobroman, Porfimer, Prednisolone, Prednisone propionate, Procarbazine, Reloxafine, Rituximab, Satriplatin, SB-743921, Sml1, Sorafinib, Streptozocin, Sunitinib, Tamoxifen, Taxotere, Taxol, Temozolomide, Teniposide, Testolactone, Testosterone, Tezacitabine, 6-Thioguanine, Thiotepa, Tipifarnib, Topotecan, Toremifene, Tositumomab, Trastuzumab, Triamcinolone, Triapine, Triethylenemelamine, Triethylenethiophosphoramine, Trimidox, Uracil mustard, Vinblastine, Vincristine, Vindesine, and Vinorelbine.