A facile new method for selective deprotection of N-(tert-butoxycarbonyl)-protected carboxamides with Yb(OTf)3 supported on silica gel
摘要:
A selective new method for the deprotection of N-Boc carboxamides was achieved by using Yb(OTf)(3), supported on silica gel under solvent-free conditions. (C) 1998 Elsevier Science Ltd. All rights reserved.
TMSOTf-mediated approach to 1,3-oxazin-2-one skeleton through one-pot successive reduction-[4 + 2] cyclization process of imides with ynamides
作者:Chen-Chen Zhang、Zhi-Peng Huo、Mei-Lin Tang、Yong-Xi Liang、Xun Sun
DOI:10.1016/j.tetlet.2021.152946
日期:2021.3
A one-pot approach to access functionalized 1,3-oxazin-2-one skeleton has been developed through successive reduction and subsequent [4 + 2] cyclization process of N-Boc lactams with ynamides by TMSOTf. As a result, a number of five to seven membered ring fused bicyclic [1,2-c][1], [3]oxazin-1-ones 12a-m and tricyclic derivatives 13a-f were obtained in moderate to excellent yields with excellent regioselectivities
[DE] NICHT-PEPTIDISCHE BRS-3-AGONISTEN<br/>[EN] NON-PEPTIDIC BRS-3 AGONISTS<br/>[FR] AGONISTES DU RECEPTEUR BRS-3 NON PEPTIDIQUES
申请人:SOLVAY PHARM GMBH
公开号:WO2003104196A1
公开(公告)日:2003-12-18
Es werden neue, selektiv BRS-3 agonistisch wirksame Verbindungen der allgemeinen Formel (I), worin A<1>, A<2 >, A<3 >, R<1>, R<2> , R<3 >, Ar<1> , Ar<2> , Ar<3> , m und n die in der Beschreibung angegebenen Bedeutungen besitzen, sowie diese Verbindungen enthaltende Arzneimittel und Verfahren zur Herstellung von Verbindungen der Formel (I) beschrieben.
Double Molecular Recognition with Aminoorganoboron Complexes: Selective Alcoholysis of β-Dicarbonyl Derivatives
作者:Shunsuke Oishi、Susumu Saito
DOI:10.1002/anie.201200304
日期:2012.5.29
Double duty: Aminoorganoboron (AOB) complexes recognize alcohol and β‐dicarbonyl units, and thereby facilitate chemo‐ and site‐selectivealcoholysis of the latter (see scheme). The complex activates both reaction partners. This strategy enables CC, CN, and CO bond cleavage in addition/elimination reactions under near neutral pH conditions and provides a new method for functional group conversions
A novel and efficient synthesis of precursors of α-amino acids is described. The key step involves a carbolithiation reaction on acyclic ene-carbamates generated from the corresponding vinylphosphates via a palladium cross-coupling reaction followed by a spontaneous internal N→C alkyloxycarbonyl migration.
Acyclic ketene aminal phosphates derived from N,N-diprotected acetamides: stability and cross-couplings
作者:Alessandro B.C. Simas、Daniel L. de Sales、Karla C. Pais
DOI:10.1016/j.tetlet.2009.09.159
日期:2009.12
The synthesis of a stable ketene aminal phosphate (α-phosphoryloxy enecarbamate) derived from N,N-diprotected acetamide, bearing two different removable protectinggroups, is disclosed. This synthetic intermediate underwent successful palladium-catalyzed cross-coupling reactions to afford functionalized enynes and dienes.