The 1,2-sulfone rearrangement resulting from nucleophilic addition to bis activated vinyl-sulfones has been studied in more detail. Various nucleophiles activated by different types of catalysts (enamine, Brönsted base, thiourea) are able to promote such rearrangement in excellent yields and moderate to excellent enantioselectivities (up to 94% ee). Mechanistic studies have led to a better unde...

Aryl-keto-containing α-amino acids are of great importance in organic chemistry and biochemistry. They are valuable intermediates for the construction of hydroxyl α-amino acids, nonproteinogenic α-amino acids, as well as other biofunctional components. Friedel-Crafts acylation is an effective method to prepare aryl-keto derivatives. In this review, we summarize the preparation of aryl-keto cont...

Tuning the morphological and acidic properties of mesoporous molecular sieve materials is highly valuable for catalyst design towards reactions involving large molecules. In this work, a series Ga-containing SBA-15 ordered (OMMs) were synthesized following acid-free strategy. Ga-SBA-15 exhibits an acid amount 0.48 mmol/g, comparable to Al-SBA-15 (0.45 mmol/g). addition, it found that straight s...

Cascade reactions provide a straightforward access to many valuable compounds and reduce considerably the number of steps synthetic sequence. Among domino multicomponent processes that involve alkynes, cascade reaction between alkynoic acids C-, N-, O- S-aminonucleophiles stands out as particularly powerful tool for one-pot construction libraries nitrogen-containing heterocyclic with scaffold d...

a simple and mild method for tetrahydropyranylation of alcohols is reported at room temperature using a catalytic amount of 3-methylimidazolinium hydrogensulfate([hmim]hso4) as a green, efficient and reusable catalyst. using solvent-free conditions, non-toxic and inexpensive materials, modest and clean work-up, short reaction times and high yields of the products are the advantages of this method.

The paper presents research results on the colorimetric behavior of impregnated fibrous chemisorbents (IFCS) basic gases with visual identification dynamic absorption capacity “response” moment (IFCS-I) during ammonia. Chemisorbents were obtained by impregnation carriers polybasic hydroxyl acid aqueous solutions adding acid-base indicators (Ind). IFCS-I based oxyethylenediphosphonic (IFCS-OEDPA...