Highly Enantioselective Synthesis of β-Amidophenylthioethers by Organocatalytic Desymmetrization of meso-Aziridines
摘要:
The desymmetrization of N-acylaziridines with Me3SiSPh, catalyzed by commercially available (R) and (S)-VAPOL hydrogen phosphate, produced beta-(N-acylamino)phenylthioethers in a highly enantioselective and efficient manner (78-99% ee). The selection of the suitable aziridine/nucleophile/catalyst molar ratio is crucial to obtain high ee's.
A general phosphoric acid-catalyzed desymmetrization of meso-aziridines with silylated selenium nucleophiles
作者:Matilde Senatore、Alessandra Lattanzi、Stefano Santoro、Claudio Santi、Giorgio Della Sala
DOI:10.1039/c1ob05837a
日期:——
The first example of meso-aziridine desymmetrization with selenium nucleophiles is reported. The reaction, promoted by VAPOL-hydrogen phosphate using (phenylseleno)trimethylsilane as the nucleophile, proves to be very general and highly enantioselective (84–99% ee).
Guanidine-catalyzed enantioselective desymmetrization of meso-aziridines
作者:Yan Zhang、Choon Wee Kee、Richmond Lee、Xiao Fu、Julian Ying-Teck Soh、Esther Mun Foong Loh、Kuo-Wei Huang、Choon-Hong Tan
DOI:10.1039/c0cc05840h
日期:——
An amino-indanol derived chiral guanidine was developed as an efficient Brønsted base catalyst for the desymmetrization of meso-aziridines with both thiols and carbamodithioic acids as nucleophiles, which provided 1,2-difunctionalized ring-opened products in high yields and enantioselectivities.
Catalytic Enantioselective Ring-Opening Reaction of<i>meso</i>-Aziridines with α-Isothiocyanato Imides
作者:Yi-Ming Cao、Fu-Ting Zhang、Fang-Fang Shen、Rui Wang
DOI:10.1002/chem.201300297
日期:2013.7.15
Open up your chemistry! By using cinchonine‐based trimeric quaternary ammonium salts as catalysts, meso‐aziridines can be ring‐opened, in an enantioselective manner, through nucleophilic addition of the sulfur atom of α‐isothiocyanato imides (see scheme; PG=protecting group). This synthetic method provides an efficient way to access useful chiral β‐aminothiooxazole compounds.
An asymmetric ring-opening reaction of meso-aziridines with TMSN3 was developed using a catalyst prepared from Y(OiPr)3 and chiral ligand 2 in a 1:2 ratio. Excellent enantioselectivity was realized from a wide range of substrates with a practical catalyst loading. The products were efficiently converted to enantiomerically enriched 1,2-diamines, which are versatile chiral building blocks for pharmaceuticals and chiral ligands. This reaction was applied to a catalytic asymmetric synthesis of Tamiflu, a very important anti-influenza drug containing a chiral 1,2-diamino functionality.
Highly Enantioselective Synthesis of β-Amidophenylthioethers by Organocatalytic Desymmetrization of <i>meso</i>-Aziridines
作者:Giorgio Della Sala、Alessandra Lattanzi
DOI:10.1021/ol901209n
日期:2009.8.6
The desymmetrization of N-acylaziridines with Me3SiSPh, catalyzed by commercially available (R) and (S)-VAPOL hydrogen phosphate, produced beta-(N-acylamino)phenylthioethers in a highly enantioselective and efficient manner (78-99% ee). The selection of the suitable aziridine/nucleophile/catalyst molar ratio is crucial to obtain high ee's.