3-substituted-1,2,4-oxadiazolin-5-one; A useful amidine precursor and protecting group
Richard E Bolton, Steven J Coote*, Harry Finch, Andrew Lowdon, Neil Pegg and M Victoria Vinader
Tetrahedron Letters
Volume 36, Issue 25, 19 June 1995, Pages 4471-4474
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http://dx.doi.org/10.1016/0040-4039(95)00755-2