Patent ID: 8685991

Claim:
A compound or salt thereof, wherein the compound corresponds in structure to formula II: wherein is selected from the group consisting of single carbon-carbon bond and double carbon-carbon bond; R 1 is selected from the group consisting of hydrogen, methyl, and nitrogen-protecting group; R 2 is selected from the group consisting of hydrogen, halo, hydroxy, methyl, cyclopropyl, and cyclobutyl; R 3 is selected from the group consisting of hydrogen, halo, oxo, and methyl; R 4 is selected from the group consisting of alkyl, alkenyl, alkynyl, nitro, cyano, azido, alkyloxy, alkenyloxy, alkynyloxy, amino, aminocarbonyl, aminosulfonyl, alkylsulfonyl, carbocyclyl, and heterocyclyl, wherein: (a) the amino, aminocarbonyl, and aminosulfonyl optionally are substituted with: (1) one or two substituents independently selected from the group consisting of alkyl, alkenyl, alkynyl, and alkylsulfonyl, or (2) two substituents that, together with the amino nitrogen, form a single-ring heterocyclyl, and (b) the alkyl, alkenyl, alkynyl, alkyloxy, alkenyloxy, alkynyloxy, and alkylsulfonyl, optionally are substituted with one or more substituents independently selected from the group consisting of halo, oxo, nitro, cyano, azido, hydroxy, amino, alkyloxy, trimethylsilyl, carbocyclyl, and heterocyclyl, wherein: the amino optionally is substituted with: (1) one or two substituents independently selected from the group consisting of alkyl, alkenyl, alkynyl, alkylcarbonyl, alkylsulfonyl, alkyloxycarbonyl, carbocyclyl, heterocyclyl, carbocyclylalkyl, and heterocyclylalkyl, or (2) two substituents that, together with the amino nitrogen, form a single-ring heterocyclyl, and (c) the carbocyclyl and heterocyclyl optionally are substituted with up to three substituents independently selected from the group consisting of alkyl, alkenyl, alkynyl, halo, oxo, nitro, cyano, azido, hydroxy, amino, alkyloxy, trimethylsilyl, carbocyclyl, and heterocyclyl, wherein: the amino optionally is substituted with: (1) one or two substituents independently selected from the group consisting of alkyl, alkenyl, alkynyl, alkylcarbonyl, alkylsulfonyl, alkyloxycarbonyl, carbocyclyl, heterocyclyl, carbocyclylalkyl, and heterocyclylalkyl, or (2) two substituents that, together with the amino nitrogen, form a single-ring heterocyclyl; R 5 is selected from the group consisting of hydrogen, hydroxy, alkyl, alkenyl, alkynyl, alkyloxy, alkenyloxy, alkynyloxy, alkylsulfonyloxy, carbocyclylsulfonyloxy, haloalkylsulfonyloxy, and halo; and X 2 is halo.