Accessing nitrosocarbonyl compounds with temporal and spatial control via the photoredox oxidation of N-substituted hydroxylamines
摘要:
Photoredox catalysis is employed to generate highly reactive acylnitroso species from hydroxamic acid derivatives. The conditions are shown to be comparable to a previously developed transition metal aerobic oxidation and are amenable to a range of transformations including Diels-Alder and ene reactions. This unique application of such an approach gives access to temporal and spatial control in nitroso chemistry. Published by Elsevier Ltd.
PROCESS FOR THE PREPARATION OF (1S,4R)-2-OXA-3-AZABICYCLO[2,2.1]HEPT-5-ENES
申请人:Franzen Manuela
公开号:US20120157671A1
公开(公告)日:2012-06-21
Enantiomerically enriched (1S,4R)-2-oxa-3-azabicyclo[2.2.1]hept-5-ene of formula wherein PG1 is an amino-protective group, are prepared from cyclopentadiene via hetero-Diels-Alder cycloaddition with protected 1-C-nitroso-β-D-ribofuranosyl halides of formula wherein X is a halogen atom selected from fluorine, chlorine, bromine and iodine, PG2 is a hydroxyl-protective group and PG3 is a 1,2-diol-protective group.
[EN] PROCESS FOR THE PREPARATION OF (1S,4R)-2-OXA-3-AZABICYCLO[2,2.1]HEPT-5-ENES<br/>[FR] PROCÉDÉ POUR LA PRÉPARATION DE (1S, 4R)-2-OXA-3-AZABICYCLO[2,2.1]HEPT-5-ÈNES
申请人:LONZA AG
公开号:WO2011023374A1
公开(公告)日:2011-03-03
Enantiomerically enriched (1 S,4R)-2-oxa-3-azabicyclo[2.2.1]hept-5-ene of formula wherein PG1 is an amino-protective group, are prepared from cyclopentadiene via hetero-Diels-Alder cycloaddition with protected 1-C-nitroso-β-D-ribofuranosyl halides of formula wherein X is a halogen atom selected from fluorine, chlorine, bromine and iodine, PG2 is a hydroxyl-protective group and PG3 is a 1,2-diol-protective group.
The present invention relates to the field of organic synthesis and describes the synthesis of specific intermediates suitable for the preparation of triazolopyrimidine compounds such as ticagrelor.
本发明涉及有机合成领域,并描述了合成特定中间体的方法,适用于制备三唑并嘧啶类化合物,如替卡格雷。
Cyclopropanation of nitroso Diels–Alder cycloadducts and application to the synthesis of a 2′,3′-methano carbocyclic nucleoside
作者:Cheng Ji、Marvin J. Miller
DOI:10.1016/j.tetlet.2010.05.062
日期:2010.7
Treatment of nitroso Diets-Alder cycloadducts 1 with diazomethane in the presence of palladium acetate gives synthetically useful exo-6-oxa-7-azatricyclo[3.2.1.0(2.4)]octane derivatives 7 in good to excellent yield. Using this methodology, a conformationally restricted 2',3'-methano carbocyclic nucleoside was efficiently synthesized from nitroso cycloadduct la in seven steps. (C) 2010 Elsevier Ltd. All rights reserved.