The synthesis of 1-aminobenzylphosphonic acids from benzylidenediphenylmethylamines, for use as structural units in antithrombotic tripeptides
摘要:
Acid hydrolyses of 0,0-dimethyl or 0,0-diethyl 1-(diphenylmethylamino) benzylphosphonate intermediates 2, formed from the addition at elevated temperature of dimethyl or diethyl phosphite to benzylidenediphenylmethylamines 1, generates 1-aminobenzylphosphonic acids 3 in good yield.
2‐Azaallyl Anions as Light‐Tunable Super‐Electron‐Donors: Coupling with Aryl Fluorides, Chlorides, and Bromides
作者:Qianmei Wang、Michal Poznik、Minyan Li、Patrick J. Walsh、Jason J. Chruma
DOI:10.1002/adsc.201800396
日期:2018.8.6
of reducing a collection of aryl halides via a single electron transfer and coupling with the corresponding radicals to forge new C−C bonds. This offers a robust approach for the arylation of 2‐azaallyls. Mechanistic studies demonstrate that the reactions proceed via either a radical pathway for aryl bromides and chlorides or a SNAr mechanism for activatedarylfluorides. Moreover, we demonstrate that
Described herein are compounds of formula (I), related compositions, and their use, for example in the formation of α-amino acids or a precursor thereof such as an α-aminonitrile.
Scaleable catalytic asymmetric Strecker syntheses of unnatural α-amino acids
作者:Stephan J. Zuend、Matthew P. Coughlin、Mathieu P. Lalonde、Eric N. Jacobsen
DOI:10.1038/nature08484
日期:2009.10
but it is still a challenge to obtain non-natural amino acids. Alkene hydrogenation is broadly useful for the enantioselective catalytic synthesis of many classes of amino acids, but it is not possible to obtain α-amino acids bearing aryl or quaternary alkyl α-substituents using this method. The Strecker synthesis—the reaction of an imine or imine equivalent with hydrogen cyanide, followed by nitrile
Brønsted acid activation of α-diazo imide: a syn-selective glycolate Mannich reaction
作者:Timothy L. Troyer、Hubert Muchalski、Jeffrey N. Johnston
DOI:10.1039/b913785h
日期:——
A novel α-diazo imide reagent and its activation by strong Brønsted acid is shown to produce the product of a syn-glycolate Mannich transform with high diastereoselection.