Reactions of tert-Butyl Tetraethylphosphorodiamidite with Acetic and Trifluoroacetic Acids

Reactions of tert-butyl tetraethylphosphorodiamidite with acetic and trifluoroacetic acids involve substitution of the amido group. This process was described by a scheme beginning with protonation of phosphorus and proved by modeling separate reaction stages. A probable scheme of the proposed reactions is described.     

Reaction of 3-(Arylmethylidene)-1-pyrrolines with Acetone. Synthesis of Norhygrine Derivatives

Russian Journal of Organic Chemistry - An efficient procedure has been developed for the synthesis of analogs of the alkaloid norhygrine by reaction of 3-(arylmethylidene)-1-pyrrolines with...     

Amplification of Stimulated Raman Scattering in Media with a Near-Zero Refractive Index

JETP Letters - Materials with a near-zero refractive index open up new possibilities for enhancing nonlinear optical interactions. This lowers the threshold for nonlinear generation, reduces the...     

S-Methyl diethylthiophosphinate in mono- and di(dechloromethylthioylation) of substituted benzylidene chlorides

Russian Chemical Bulletin - The main route of a new reaction of (dichloromethyl)arenes with S-methyl diethylthiophosphinate is the attack of the thiol sulfur atom (P–SMe) on the methylene...     

Synthesis of 1-(arylsulfonyl)pyrrolidines from phenols and 1-[(4-chlorophenyl)sulfonyl]-2-ethoxypyrrolidine

Acid-catalyzed reaction of 1-[(4-chlorophenyl)sulfonyl]-2-ethoxypyrrolidine with phenols leads to the formation of new 1-(arylsulfonyl)pyrrolidines. The reaction proceeds under mild conditions and may be used as a convenient method for the synthesis of pyrrolidine-1-sulfonylarene derivatives containing a phenol fragment in the position 2.     

Similarity of approximate transformation groups

We propose similarity conditions for isomorphic approximate transformation groups and their Lie algebras. The construction of similarity transformations reduces to solving systems of firstorder semilinear partial differential equations with small parameter. We consider the solvability of overdetermined systems of this type and the structure of their general solutions.     

Benzofuroxans: their synthesis,properties, and biological activity

The review provides a brief historical background for the establishment of structure of benzofuroxanes. Methods for their synthesis are summarized, and the chemical properties are described, which are splitted into two parts: reactions proceeding with a ring opening of the heterocycle, and those occuring with a participation of the isocyclic moiety. The biological activity of various representatives belonging to the benzofuroxan series is covered in details.

     

Synthesis of New (2-Acetamido)phenylglyoxylamides Containing an Acetal Fragment

Russian Journal of Organic Chemistry - Mild opening of the five-membered ring in 1-acetylisatins by the action of an equimolar amount of 4,4-diethoxybutan-1-amine afforded...     

Convenient synthesis of 2-(het)arylpyrrolidines via stable 1-pyrrolinium salts

The efficient method for the synthesis of 2-(het)aryl-substituted pyrrolidines possessing exocyclic carbon-carbon double bond via the Mannich-type reaction of stable 3-arylidene-1-pyrrolinium salts with different heterocyclic C-nucleophiles is proposed.