(6aS*,6bS*,11R*,11aR*)-6-(2-Furyl-methyl)-5,12-dioxo-5,6,6a,6b,7,11,11a,12-octa-hydro-furo[3',2':5,6]isoindolo[2,1-a]quinazoline-11-carb-oxy-lic acid

Crystal structure of (±)-(3aR,5R,8bR)-5-hydroper-oxy-2-phenyl-6-tosyl-4,5,6,8b-tetra-hydro-pyrrolo-[3,4-e]indole-1,3(2H,3aH)-dione

The title compound crystallized as racemic tandem OO—H⋯O=C hydrogen-bonded dimers stacked along [100] in the space group P. This is the first crystallographically characterized example of a hydro­peroxide obtained from the autoxidation of a Diels–Alder adduct of a 2-vinyl five-membered heterocycle.

The title compound, C₂₃H₂₀N₂O₆S, crystallizes as a racemate in the space group P-1, with an overall L- or J-shape to each mol­ecule. Centrosymmetric pairs of mol­ecules are tandem hydrogen bonded between the hydro­per­oxy H atom and carbonyl O atom. A different centrosymmetric pairing has stacked S-tolyl rings, and a third pairing is L,J-inter­locked by the short leg. Except for stacked tolyl pairs, neighboring π-systems are much closer to orthogonal than coaxial. The title compound is the first example of a hydro­peroxide obtained from the autoxidation of a Diels–Alder adduct of a 2-vinyl­pyrrole.