Synthesis of N-Acyl-N,?,?-Trialkyl and N-Acyl-?,?-Dialkyl Glycines by Selective Cleavage of Ugi?Passerini Adducts. Qualitative Assessment of the Effect of Substituents on the Path and Yield of Reactionelectronic Supplementary Information (Esi) Available: Experimental Details. See Http://Www.rsc.org/Suppdata/Ob/B3/B307111C/