. Author manuscript; available in PMC: 2015 Apr 1.
Published in final edited form as: Tetrahedron Lett. 2015 Apr 1;56(14):1911–1914. doi: 10.1016/j.tetlet.2015.02.116
© 2015 The Authors.
This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).