181376-74-9Relevant academic research and scientific papers
Acceptor-Controlled Transfer Dehydration of Amides to Nitriles
Okabe, Hiroyuki,Naraoka, Asuka,Isogawa, Takahiro,Oishi, Shunsuke,Naka, Hiroshi
supporting information, p. 4767 - 4770 (2019/06/17)
Palladium-catalyzed dehydration of primary amides to nitriles efficiently proceeds under mild, aqueous conditions via the use of dichloroacetonitrile as a water acceptor. A key to the design of this transfer dehydration catalysis is the identification of an efficient water acceptor, dichloroacetonitrile, that preferentially reacts with amides over other polar functional groups with the aid of the Pd catalyst and makes the desired scheme exergonic, thereby driving the dehydration.
Rhodium-catalyzed enantioselective hydrogenation of α-amino acrylonitriles: an efficient approach to synthesizing chiral α-amino nitriles
Li, Xiuxiu,You, Cai,Yang, Yusheng,Wang, Fangyuan,Li, Shuailong,Lv, Hui,Zhang, Xumu
, p. 1313 - 1316 (2017/02/05)
An efficient rhodium-catalyzed asymmetric hydrogenation of α-amino acrylonitriles has been developed, affording α-acylamino nitriles with high yields and excellent enantioselectivities (up to 99% yield and >99% ee). This novel methodology provides an effi
Process for the preparation of enantiomerically enriched compounds
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Page/Page column 5, (2010/11/29)
1. Process for the preparation of enantiomerically enriched amino aldehydes and amino alcohols, wherein a corresponding enantiomerically enriched amino nitrile is subjected to hydrogenation in the presence of hydrogen, a hydrogenation catalyst, preferably a Pd-catalyst and a mineral acid. For the preparation of an amino aldehyde hydrogen preferably is present at a hydrogen-pressure between 0.1 and 2 MPa, in particular between 0.5 and 1 MPa. The amino aldehyde preferably is isolated in the form of a chemically and configurationally stable derivative. For the preparation of an amino alcohol, preferably at least during part of the hydrogenation hydrogen is present at a hydrogen-pressure between 2 and 10 MPa, in particular between 4 and 6 MPa. In a preferred embodiment the hydrogen-pressure initially is between 0,5 and 2 MPa and subsequently, after most of the nitrile starting material is converted, the hydrogen pressure is increased to a value between 2 and 10 MPa. The enantiomerically enriched nitrile starting material may a.o. be prepared by enzymatic resolution, classical resolution, resolution via preferential crystallization, diastereomeric synthesis, catalytic asymmetric synthesis or dehydratation of amino acid amides.
Desilylative elimination of the quinazolinone ring from 1-(4-oxoquinazolin-3-yl)-2-silylaziridines; preparation of an N-H aziridine in high enantiomeric excess by in situ nucleophilic addition to the derived azirine
Atkinson, Robert S.,Coogan, Michael P.,Lochrie, Ian S. T.
, p. 897 - 900 (2007/10/03)
Aziridination of vinylsilanes PhCH=CHSiR3 (R = Me, Et, Ph) with enantiopure 3-acetoxyaminoquinazolinone 11 gives the corresponding aziridines 12 [diastereoisomer ratio (dr) 10:1], 18 (dr 13:1) and 20 (dr 2:1). Desilylative elimination of the quinazolinone from these aziridines by caesium fluoride in the presence of cyanide gives aziridine 14 by cyanide addition to the 3-unsubstituted azirine 13, produced in situ. Acylation of aziridine 14 with (S)-acetoxypropionyl chloride gives N-acylaziridine 16; the good correlation between the diastereoisomer ratios of aziridines 12, 18 and 20 and those of the N-acylaziridine 16 produced in each case suggests that intermediate azirine 13 is configurationally stable.
Reagent-controlled diastereoselectivity in aziridination of alkenes by chiral 3-acetoxyamino-3,4-dihydroquinazolin-4-ones: 1'-(t- butyldimethylsilyloxy)ethyl as the chiral 2-substituent on the quinazolinone
Atkinson, Robert S.,Coogan, Michael P.,Lochrie, Ian S. T.
, p. 5179 - 5182 (2007/10/03)
Conformational preferences within the (t)BuMe2SiOCH(Me)C=N unit in 3- acetoxyaminoquinazolinone 3 lead to well defined site preferences for H, Me and OSiMe21Bu in the transition state for, and hence high diastereoselectivity in, its reaction with β-trimethylsilylstyrene 4 to give aziridine 5.
Preparation of N-H aziridines in high enantiomeric excess by in situ aziridine-azirine-aziridine interconversion
Atkinson, Robert S.,Coogan, Michael P.,Lochrie, Ian S. T.
, p. 789 - 790 (2007/10/03)
Aziridine 6 is produced highly diastereoselectively by treatment of enantiopure 3-acetoxyaminoquinazolinone 4 (Q*NHOAc) with β-trimethylsilylstyrene: desilylative elimination of Q* and in situ addition of cyanide to the intermediate azirine gives the NH-a
