Lodhi,

See

--- Raju, N. et al Tetrahedron, 48(47), 10233-8; 1992

and the enclosed file may help

Good luck

i hope these articles will be helpful ti you

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3086661/

http://pubs.rsc.org/en/Content/ArticleLanding/2015/QO/C5QO00211G#!divAbstract

http://onlinelibrary.wiley.com/doi/10.1002/jhet.5570190206/abstract

Consider for instance an ANRORC rearrangement at the nitroimidazole together wit the distorsion model proposed by Houk

thanks Adel Amer , Zeeshan & Renato Contreras