In the reaction with pyrrolidine, the (Z)-6-oxime (2) of 3a-aryl-5,6a-diphenyl-3a,6a-dihydro-2H-furo[3,2-b]pyrrole-2,6(3H)-dione (1) gave the (Z)-oxime (3) in which the lactone ring was opened. (Z)-Oxime 3 isomerized on silica gel to give (E)-oxime 4. Treatment of 2 with tosyl chloride in aqueous ethanolic sodium hydroxide afforded 5-aryl-2-cyano-2-phenyl-1H-pyrrol-3(2H)-ones (7) in yields of 41—90%, while both 3a and 4a gave the pyrroline-ring-opened product 8 in moderate yields.
在与
吡咯烷反应中,3a-芳基-5,6a
-二苯基-3a,6a-二氢-2H-
呋喃[3,2-b]
吡咯-2,6(3H)-二酮(1)的(Z)-6-
肟(2)生成了乳酯环打开的(Z)-
肟(3)。(Z)-
肟3在
硅胶上异构化生成(E)-
肟4。将2与
氯托烷在
水醇
钠氢氧化物中处理,获得了5-芳基-2-
氰基-2-苯基-
1H-吡咯-3(2H)-酮(7),产率为41-90%,而3a和4a都分别得到了
吡咯啉环打开的产物8,产率为中等
水平。