o-Nitrobenzyl as a photocleavable nitrogen protecting group for indoles, benzimidazole, and 6-chlorouracil
作者:Troy Voelker、Tim Ewell、Jean Joo、Eric D. Edstrom
DOI:10.1016/s0040-4039(97)10600-1
日期:1998.1
The potential for the o-nitrobenzyl group as an alternative nitrogen protecting group for various indoles, benzimidazole, and 6-chlorouracil was determined. Treatment of the appropriate N-H containing substrate with LiH or NaH in DMF followed by o-nitrobenzyl bromide afforded reasonable yields of N-alkylated products. To effect removal of this group, simple photolysis with 300 nm light afforded good yields of starting substrate. (C) 1997 Elsevier Science Ltd. All rights reserved.
A new palladium-mediated approach to 4-N-arylamino-1-butanols from peroxidic tetrahydrofuran and primary aromatic amines
作者:Henry F. Russell、John B. Bremner、Jennifer Bushelle-Edghill、Melissa R. Lewis、Stacey R. Thomas、Floyd Bates
DOI:10.1016/j.tetlet.2006.12.136
日期:2007.2
Reaction of primary aromatic amines with peroxidic tetrahydrofuran (THF) in the presence of hydrogen and 10%, palladium on carbon catalyst results in THF ring opening to give 4-N-arylamino-1-butanols in a good yield. The reaction mechanism is believed to involve a free-radical sequence resulting in an imino alcohol subsequently reduced to product. (c) 2007 Elsevier Ltd. All rights reserved.