Crystal structures of 2′-benzoyl-1′-(4-methyl­phenyl)-1,1′,2,2′,5′,6′,7′,7a′-octa­hydro­spiro­[indole-3,3′-pyrrolizin]-2-one and 2′-(4-bromo­benzoyl)-1′-(2-chloro­phen­yl)-1,1′,2,2′,5′,6′,7′,7a′-octa­hydro­spiro­[indole-3,3′-pyrrolizin]-2-one

The two title compounds, C(28)H(26)N(2)O(2), (I), and C(27)H(22)BrClN(2)O(2), (II), differ in their substituents, viz.4-methyl­phenyl and benzoyl rings in (I) replaced by 2-chloro­phenyl and 4- bromo­benzoyl, respectively, in (II). A significant difference between the two mol­ecules is found in the deviation of the benzoyl O atom from the least-squares plane of the ring to which it is attached [0.593 (4) and 0.131 (3) Å, respectively], a fact which may be attributed to the different participation of the benzoyl O atoms as acceptors in their inter­molecular C—H⋯O inter­actions. The chemical modifications in (I) and (II) do not seem to affect the type nor strength of the inter­molecular N—H⋯N and C—H⋯O hydrogen bonds responsible for the two crystal structures, such that the aggregation of mol­ecules appears similar in spite of the mol­ecular changes.