... Tetrahedron. Volume 69, Issue 24, 17 June 2013, Pages 4933–4937. ... NFSI analogues 1b (47% ee, 72%), 1c (21% ee, 79%), and 1d (39% ee, 69%) led to worse reactivity and enantioselectivity comparing with NFSI 1a that gave a higher value (69%) of 3h in 66% yield. ...