(3aR,6S,7aR)-7a-Chloro-2-[(4-nitro­phen­yl)sulfon­yl]-1,2,3,6,7,7a-hexa­hydro-3a,6-ep­oxy­iso­indole

In the title compound, C₁₄H₁₃ClN₂O₅S, the chlorine-substituted tetrahydrofuran ring adopts a twist conformation and the other tetra­hydro­furan ring an envelope conformation with the O atom as the flap. The pyrrolidine ring adopts a twist conformation. In the crystal, C—H...O hydrogen bonds link the mol­ecules into zigzag chains running along the b-axis direction.

(3aR,6S,7aR)-7a-Chloro-6-methyl-2-(4-nitro­phenyl­sulfon­yl)-1,2,3,6,7,7a-hexa­hydro-3a,6-ep­oxy­iso­indole

In the title compound, C₁₅H₁₅ClN₂O₅S, the tetra­hydro­furan ring adopts an envelope conformation with the O atom as the flap. The pyrrolidine ring adopts an envelope conformation with the chlorine-substituted C atom as the flap. In the crystal, two types of C—H...O hydrogen bonds generate R²₂(20) and R⁴₄(26) rings, with adjacent rings running parallel to ac plane. Further C—H...O hydrogen bonds form a C(6) chain, linking the mol­ecules in the b-axis direction.