Utilization of lithium triethylborohydride as a selective N-acyl deprotecting agent
摘要:
Lithium triethylborohydride has been found to be a superior and selective reagent for the removal of tertiary N-acyl protecting groups. The reagent selectively removes tertiary amide acyl functionality without affecting secondary amide functionality even when they are present in the same molecule. Some tertiary carbamates may be also removed under the same conditions. (C) 2002 Published by Elsevier Science Ltd.
Trapping of carbamic acid species with (trimethylsilyl)diazomethane
作者:Yoshikatsu Ito、Hiromi Ushitora
DOI:10.1016/j.tet.2005.09.116
日期:2006.1
Methoxycarbonylation of a variety of amines into the corresponding methyl carbamates was accomplished by allowing them to react with (trimethylsilyl)diazomethane TMSCHN2 under bubbling of CO2. The reaction was performed at room temperature for a period of ca. 2h in benzene-MeOH (4/1 v/v), which was the solvent of choice. In this mixed solvent, undesirable bicarbonate is formed in equilibrium along with carbamate anion. Owing to the irreversibility in the esterification step by TMSCHN2, however, the yield of methyl carbamate can reach very high. (c) 2005 Elsevier Ltd. All rights reserved.
Raucher, Stanley; Jones, David S., Synthetic Communications, 1985, vol. 15, # 11, p. 1025 - 1032
作者:Raucher, Stanley、Jones, David S.
DOI:——
日期:——
Baker, Journal of the Chemical Society, 1927, p. 568
作者:Baker
DOI:——
日期:——
RAUCHER, S.;JONES, D. S., SYNTH. COMMUN., 1985, 15, N 11, 1025-1031
作者:RAUCHER, S.、JONES, D. S.
DOI:——
日期:——
TRICYCLIC COMPOUNDS AS MATRIX METALLOPROTEINASE INHIBITORS