4,4,7,7‐Tetramethyl‐2‐tosyl‐2,3,3a,4,6,7,8,9‐octahydro‐1H‐pyrrolo[3,4‐c]pyrano[6,5‐b]cyclohexan‐9‐one

The title compound, C22H29NO4S, crystallizes with three independent mol­ecules, A, B and C, in the asymmetric unit. Each of the three independent mol­ecules adopts a folded conformation, with the phenyl­sulfonyl group lying over the pyran­ocyclo­hexa­none ring system, and with the pyrrolidine and dihydro­pyran rings cis-fused. In all three mol­ecules, the pyrrolidine ring has a twist conformation and the dihydro­pyran ring is in a half-chair conformation. The cyclo­hexenone rings adopt envelope conformations, with the flap atom puckered towards the phenyl­sulfonyl group in mol­ecule A, and away from that group in mol­ecules B and C, resulting in a different overall conformation for mol­ecule A compared to B and C. In all mol­ecules, the tosyl group is equatorially attached to the pyrrolidine ring. In the crystal structure, the mol­ecules are linked into a three-dimensional framework by C—H⋯O hydrogen bonds.