2- Amino-2-benzyl-3-mcthyl

Amino- 522, 685 4-Amino- 478, 684f., 783 4-(2-Amino-athyl)- 115 2-Amino-4-mcthyl- 686 4-Benzyl-... 

SCHEME 4.5 1,2-Migration in the stereoselective synthesis of 1, 2-tram (amino)-glyco-sides and 2-deoxyglycosides as reported by (a) Danishefsky, (b) Yu, and (c) Lowary. Ac, acetyl All, allyl Bn, benzyl Bz, benzoyl DTBMP, 2,6-di-fert-butyl-4-mcthyl pyridine TBDPS, ferf-butyldiphenylsilyl THF, tetrahydrofuran TIPS, triisopropylsilyl Tol, 4-tolyl. 

Under conditions of thermolysis, photolysis and hydrogenation certain isoxazoles can be converted into imidazoles. For example, merely heating 5-amino-3,4-diaUcylisoxazoles at 180-190°C gives 40-65% yields of 4,5-dialkylimidazolln-2-ones in what initially appears to be a Dimroth-type rearrangement. Compounds such as 4-mcthyl-5-propyl-, 4-butyl-5-propyl, 5-benzyl-4-methyl-, 4,5-dimethyl- and 4-ethyl-5-methylimidazoles can be formed in the same way, but only if urea is present and if the reaction is carried out in the condensed phase. Without the added urea (or an arylamine) the yields are only 40-65% with urea they reach 70-90% [29-31]. 

Bcnzylamino-5-brom- 240 2-Benzylamino-5-hydroxy-4-phenyl- 160 5-Bcnzylainino-4-methoxycarbonyl- 149 2-Benzylamino-4-methyl- 93 2-Benzylamino-5-nitro-4-phenyl- 136 2-Benzylamino-5-phenylthio- 293 4-Benzyl-2-(benzyl-methyl-amino)- 228 4-Benzyl-2-(bcnzyl-mcthyl-amino)-5-formyl-... 

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