13676-12-5Relevant academic research and scientific papers
Phosphine-catalyzed tandem α-O-addition and transesterification of oxgen pronucleophiles on arylpropiolates: A new route to dioxygenated heterocyles
Gabillet, Sandra,Lecercle, Delphine,Loreau, Olivier,Dezard, Sophie,Gomis, Jean-Marie,Taran, Frederic
, p. 515 - 522 (2007)
A practical one step procedure for the synthesis of 1,4-di-oxane-2-one and 1,4-benzodioxine-2-one derivatives is described. Georg Thieme Verlag Stuttgart.
1,3-Dipolar Cycloadditions of Ethoxycarbonyl-nitrile Benzylamine, and Synthesis of β-Amino Acids. Synthesis and Reactions of Ethyl 2-Chloro-2-ethoxyacetate and 2-Chloro-2-ethoxyacetyl Chloride
Bach, Karen K.,El-Seedi, Hesham R.,Jensen, Henrik M.,Nielsen, Helene B.,Thomsen, Ib,Torssell, B. G.
, p. 7543 - 7556 (2007/10/02)
The principles of 1,2-cyano-hydroxylation of olefins were applied to the preparation of 1,2-cyano-amines.The dipole component of this cycloaddition was nitrile imines, which formed pyrazolines with olefins.Ring cleavage was accomplished by thermolysis of 3-carboxypyrazolines, which gave 1,2-cyano-amines and subsequent hydrolysis gave β-amino acids.The synthesis of the title reagents were described.Ethyl 2-chloro-2-ethoxy-acetate gave selectively oximes, hydrazones, nitrones, and phosphonium salts with hydroxylamine, hydrazines, N-substituted hydroxylamines and triphenylphosphine respectively.The phosphonium salt was used in a Wittig reaction with aldehydes to give α-ketoesters.Treatment of the acid chloride with allyl alcohols and subsequently with a monosubstituted hydroxylamine gave the allylic ester nitrone, which underwent intramolecular cyclization.Similarly, intramolecular cyclization were carried out with the allylic ester - nitrile oxime and allylic ester - nitrile imine systems.
An interesting chloride ion effect in the Heck reaction
Merlic, Craig A.,Semmelhack, M.F.
, p. C23 - C27 (2007/10/02)
Addition of chloride ion is found to enhance the yields of cross-couplings between aryl iodides and selected olefin acceptors.
