... Tetrahedron Letters. Volume 46, Issue 38, 19 September 2005, Pages 6537–6540. ... CO 2 Me (73%), OMe (73%)]; (d) Tf 2 O, EtN-i-Pr 2 , CH 2 Cl 2 , −78 to 20 °C, 16 h [R 2 = Me (95%), NO 2 (75%), CO 2 Me (91%), OMe (93%)]; (e) RhCl 3 , EtOH, Δ, 3.5 h [R 2 = Me (46%), NO 2 (45 ...