Recently a large quantity of N-(tert-butoxycarbonyl)-N′-methylthiourea (2) was required for preparation of a cyclic guanidine compound for our ongoing project. Guanidines can be prepared in many ways as described in a communication by Poss et al. [ 1 1. Poss , MA ; Iwanowicz , E. ; Reid , JA ; Lin , J. ; Gu , Z. A mild and efficient method for the preparation of guanidines . Tetrahedron Lett. 1992 , 33 , 5933 – 5936 . ... View all references ] He also described how compound ...
