4-Amino-6-(4-amino-1-oxo-but-2-enylamino)-quinazoline derivatives (I) are new. 4-Amino-6-(4-amino-1-oxo-but-2-enylamino)-quinazoline derivatives of formula (I) and their tautomers, stereoisomers and salts are new. [Image] R abenzyl, 1-phenylethyl or 3-chloro-4-fluorophenyl； R bdimethylamino, N-methyl-N-ethylamino, Diethylamino, N-methyl-N-isopropylamino, N-methyl-N-cyclopropylamino, N-methyl-N-(2-methoxyethyl)-amino, N-ethyl-N-(2-methoxyethyl)-amino, bis-(2-methoxyethyl)-amino, morpholino, N-methyl-N-(tetrahydrofuran-3-yl)-amino, N-methyl-N-(tetrahydrofuran-2-yl-methyl)-amino, N-methyl-N-(tetrahydrofuran-3-yl-methyl)-amino, N-methyl-N-(tetrahydropyran-4-yl)-amino or N-methyl-N-(tetrahydropyran-4-ylmethyl)-amino； R ccyclopropylmethoxy, cyclobutyloxy, cyclopentyloxy, tetrahydrofuran-3-yloxy, tetrahydrofuran-2-yl-methoxy, tetrahydrofuran-3-yl-methoxy, tetrahydropyran-4-yloxy or tetrahydropyran-4-ylmethoxy； and provided the following compounds are excluded: (1) 4-((3-chloro-4-fluorophenyl)-amino)-6-((4-(N,N-diethylamino)-1-oxo-2-buten-1-yl)-amino)-7-cyclopropylmethoxy-quinazoline； (2) 4-((3-chloro-4-fluorophenyl)-amino)-6-((4-(morpholin-4-yl)-1-oxo-2-buten-1-yl)-amino)-7-cyclopropylmethoxy-quinazoline； (3) 4-((3-chloro-4-fluorophenyl)-amino)-6-((4-(dimethylamino)-1-oxo-2-buten-1-yl)-amino)-7-cyclopropylmethoxy-quinazoline； (4) 4-((3-chloro-4-fluorophenyl)-amino)-6-((4-(morpholin-4-yl)-1-oxo-2-buten-1-yl)-amino)-7-cyclobutyloxy-quinazoline； (5) 4-((3-chloro-4-fluorophenyl)-amino)-6-((4-(morpholin-4-yl)-1-oxo-2-buten-1-yl)-amino)-7-cyclopentyloxy-quinazoline； (6) 4-((3-chloro-4-fluorophenyl)-amino)-6-((4-(diethylamino)-1-oxo-2-buten-1-yl)-amino)-7-cyclobutyloxy-quinazoline； (7) 4-((3-chloro-4-fluorophenyl)-amino)-6-((4-(diethylamino)-1-oxo-2-buten-1-yl)-amino)-7-cyclopentyloxy-quinazoline； (8) 4-((R)-(1-phenyl-ethyl)-amino)-6-((4-(morpholin-4-yl)-1-oxo-2-buten-1-yl)-amino)-7-cyclobutyloxy-quinazoline； (9) 4-((R)-(1-phenyl-ethyl)-amino)-6-((4-(morpholin-4-yl)-1-oxo-2-buten
