反应详情

A method for preparing the dihydrochloride salt of [1S-[1a,2b,3b,4a(S*)]]-4-[7-[[1-(3-chloro-2-thienyl) methyl]propyl]amino]-3H-imidazo[4,5-b]pyridin-3-yl]-N-ethyl-2,3-dihydroxycyclopentanecarboxamide comprising the steps of reacting 4-chloro-3-nitropyridin-2(1H)-one with (R)-3-chloro-α-ethyl-2-thiopheneethanamine to form (R)-N-[1-[(3-chloro-2-thienyl)methyl]propyl]-2-hydroxy-3-nitro-4-pyridinamine, followed by replacing the hydroxy moiety of (R)-N-[1-[(3-chloro-2-thienyl)methyl]propyl]-2-hydroxy-3-nitro-4-pyridinamine with a chloro group to form (R)-2-chloro-N-[1-[(3-chloro-2-thienyl)methyl]propyl]-3-nitro-4-pyridinamine, followed by reacting (R)-2-chloro-N-[1-[(3-chloro-2-thienyl)methyl]propyl]-3-nitro-4-pyridinamine wit 2R,3S-isopropylidenedioxy-4R-amino-1S-ethylaminocarbonylcyclopentane to form [3aR-[3aa,4a,6a(R*),6aa]]-6-[[4-[[1-[(3-chloro-2-thienyl)methyl]propyl]amino]-3-nitro-2-pyridinyl]amino, followed by reducing [3aR-[3aa,4a,6a(R*),6aa]]-6-[[4-[[1-[(1-chloro-2-thienyl)methyl]propyl]amino]-3-nitro-2-pyridinyl]amino to [3aR-[3aa,4a,6a(R*),6aa]]-6-[[3-amino-4-[[1-[(3-chloro-2-thienyl)methyl]propyl]amino]-2-pyridinyl]amino]-N-ethyltetrahydro-2,2-dimethyl-4H-cyclopenta-1,3-dioxole-4-carboxamide, followed by hydrolyzing [3aR-[3aa,4a,6a(R*),6aa]]-6-[[3-amino-4-[[1-[(3-chloro-2-thienyl)methyl]propyl]amino]-2-pyridinyl]amino]-N-ethyltetrahydro-2,2-dimethyl-4H-cyclopenta-1,3-dioxole-4-carboxamide, in the presence of hydrochloric acid, said steps being effected in a concatenated manner, without a necessity for interim isolation and purification of intermediate compounds [3aR-[3aa,4a,6a(R*),6aa]]-6-[[3-amino-4-[[1-[(3-chloro-2-thienyl)methyl]propyl]amino]-2-pyridinyl]amino]-N-ethyltetrahydro-2,2-dimethyl-4H-cyclopenta-1,3-dioxole-4-carboxamide, [3aR-[3aa,4a,6a(R*)6aa]]-6-[[4-[[1-[(3-chloro-2-thienyl)methyl]propyl]amino]-3-nitro-2-pyridinyl]amino]-N-ethyltetrahydro-2,2-dimethyl-4H-cyclopenta-1,3-dioxole-4-carboxamide,(R)-2-chloro-N-[1-[(3-chloro-2-thienyl) methyl]propyl]-3-nitro-4-pyridinamine or (R)-N-[1-[(3-chloro-2-thienyl)methyl]propyl]-2-hydroxy-3-nitro-4-pyridinamine.