Single-step conversion of N-benzyl, N-trityl and N-diphenylmethyl amines to t-butyl carbamates using polymethylhydrosiloxane
作者:S. Chandrasekhar、B.Nagendra Babu、Ch.Raji Reddy
DOI:10.1016/s0040-4039(03)00172-2
日期:2003.3
t-Butyl carbamates were obtained efficiently in high yields from the corresponding N-benzyl, N-trityl and N-diphenylmethyl precursors in a single-step reductive transformation employing polymethylhydrosiloxane and di-t-butyl dicarbonate under Pd(OH)(2)/C catalysis. (C) 2003 Elsevier Science Ltd. All rights reserved.
Detritylation of<b>
<i>N</i>
</b>-Tritylamines via a Naphthalene-Catalyzed Lithiation Process
作者:Miguel Yus、Cherif Behloul、David Guijarro
DOI:10.1055/s-2004-822358
日期:——
The reaction of aliphatic and aromatic secondary and tertiary N-tritylamines 1 with lithium powder and a catalytic amount of naphthalene led to reductive detritylation, affording the corresponding amines 2 in good to excellent yields. The trityl group could selectively be removed in the presence of an allyl or a benzyl group. The detritylation process could successfully be extended to several hydroxy, alkoxy and amino functionalized N-tritylamines. The chemoselectivity between the trityl-nitrogen and the trityl-oxygen bond cleavages was also studied. This methodology represents an efficient deprotection of N-tritylamines under nonacidic reaction conditions.