Osmium-Catalyzed Vicinal Oxyamination of Alkenes by <i>N</i>-(4-Toluenesulfonyloxy)carbamates
作者:Masruri、Anthony C. Willis、Malcolm D. McLeod
DOI:10.1021/jo301372y
日期:2012.10.5
N-(4-Toluenesulfonyloxy)carbamates based on a range of common amine protecting groups serve as preformed nitrogen sources in the intermolecular osmium-catalyzedoxyamination reaction of a variety of mono-, di-, and trisubstituted alkenes. The reactions occur with low catalyst loadings and good yields and afford high regioselectivity for unsymmetrically substituted alkenes.
[EN] IMPROVED AMINOHYDROXYLATION OF ALKENES<br/>[FR] AMINOHYDROXYLATION AMÉLIORÉE D'ALCÈNES
申请人:IND RES LTD
公开号:WO2011159177A1
公开(公告)日:2011-12-22
The invention relates to a process for the aminohydroxylation of alkenes using N-oxycarbamate reagents, e.g. N-acyloxycarbamate, N-alkyloxycarbonyloxycarbamate and N-aralkoxycarbonyloxycarbamate reagents. The invention particularly relates to an intermolecular aminohydroxylation reaction that can be carried out in the absence of added base. The invention also relates to novel N-oxycarbamate reagents that are stable crystalline materials. The process of the invention is useful in the synthesis of compounds having a vicinal amino alcohol moiety, such as biologically active compounds.
Heterogeneous asymmetric aminohydroxylation of alkenes using a silica gel-supported bis-cinchona alkaloid
作者:Choong Eui Song、Chun Rim Oh、Sung Woo Lee、Sang-gi Lee、Laetitia Canali、David C. Sherrington
DOI:10.1039/a806959j
日期:——
Excellent enantioselectivities of up to >99% ee have been achieved in the heterogeneous asymmetric aminohydroxylation of trans-cinnamate derivatives using silica gel-supported (QN)2PHAL [SGS-(QN)2PHAL 1]; the dark brown 1·Os complex, recovered by simple filtration after reaction, could be reused without any loss of enantioselectivity.
在使用硅胶支撑的 (QN)2PHAL [SGS-(QN)2PHAL 1] 进行反式肉桂酸酯衍生物的异相不对称氨基羟基化反应中,实现了高达 >99% ee 的优异对映选择性;反应后通过简单过滤回收的深棕色 1-Os 复合物可重复使用,而不会损失任何对映选择性。
AMINOHYDROXYLATION OF ALKENES
申请人:Mee Simon Peter Harold
公开号:US20130274479A1
公开(公告)日:2013-10-17
The invention relates to a process for the aminohydroxylation of alkenes using N-oxycarbamate reagents, e.g. N-acyloxycarbamate, N-alkyloxycarbonyloxycarbamate and N-aralkoxycarbonyloxycarbamate reagents. The invention particularly relates to an intermolecular aminohydroxylation reaction that can be carried out in the absence of added base. The invention also relates to novel N-oxycarbamate reagents that are stable crystalline materials. The process of the invention is useful in the synthesis of compounds having a vicinal amino alcohol moiety, such as biologically active compounds.
Alkyl 4-Chlorobenzoyloxycarbamates as Highly Effective Nitrogen Source Reagents for the Base-Free, Intermolecular Aminohydroxylation Reaction
作者:Lawrence Harris、Simon P. H. Mee、Richard H. Furneaux、Graeme J. Gainsford、Andreas Luxenburger
DOI:10.1021/jo1018816
日期:2011.1.21
Ethyl- (7), benzyl- (8), tert-butyl- (9), and fluorenylmethyl-4-chlorobenzoyloxycarbamates (10) have been prepared as storable and easy-to-prepare nitrogen sources for use in the intermolecular Sharpless aminohydroxylation reaction and its asymmetric variant. These reagents were found to be effective under base-free reaction conditions. The scope and limitations of these methods have been explored using a variety of alkenes, among which, trans-cinnamates, in particular, proved to be good substrates.