α-<i>N</i>-Heteroarylation and α-Azidation of Ketones via Enolonium Species
作者:Atul A. More、Gulab K. Pathe、Keshaba N. Parida、Shimon Maksymenko、Yuriy B. Lipisa、Alex M. Szpilman
DOI:10.1021/acs.joc.7b03058
日期:2018.2.16
Enolonium species, resulting from the umpolung of ketone enolates by Koser’s hypervalentiodinereagents activated by boron trifluoride, react with a variety of nitrogen heterocycles to form α-aminated ketones. The reactions are mild and complete in 4–5 h. Additionally, α-azidation of the enolonium species takes place using trimethylsilyl azide as a convenient source of azide nucleophile.
METHOD FOR PREPARATION OF CARBAMIC ACID (R)-1-ARYL-2-TETRAZOLYL-ETHYL ESTER
申请人:Lim Sang Chul
公开号:US20100323410A1
公开(公告)日:2010-12-23
Disclosed is a method for the preparation of carbamic acid (R)-1-aryl-2-tetrazolyl-ethyl ester, comprising the asymmetric reduction of arylketone and the carbamation of alcohol.
the chemoselective mono- and diamination of ketoneusing pyrazole as the amine source in a combined copper–organocatalyst system. Various substrates are compatible, providing the corresponding products in moderate to good yields. This strategy gives an efficient and convenient solution for the synthesis of α-pyrazole and α,α-dipyrazole ketonederivatives. The control experiment demonstrates that in
Method For Preparing Aryl 2-Tetrazol-1-Yl Keto With Improved Selectivity
申请人:SK BIOPHARMACEUTICALS CO., LTD.
公开号:US20210122719A1
公开(公告)日:2021-04-29
The present disclosure relates to a method for preparing aryl 2-tetrazol-2-yl ketone of the following Formula 1a with improved selectivity:
wherein R
1
and R
2
are the same as defined herein.
Method for Preparation of Carbamic Acid (R)-1-Aryl-2-Tetrazolyl-Ethyl Ester
申请人:Lim Sang Chul
公开号:US20110111467A1
公开(公告)日:2011-05-12
Disclosed is a method for the preparation of carbamic acid (R)-1-aryl-2-tetrazolyl-ethyl esters, comprising the enantioselective enzyme reduction of a 1-aryl-2-tetrazolyl-ethyl ketone to form a (R)-1-aryl-2-tetrazolyl-ethyl alcohol and the carbamation of said alcohol.