An Efficient Synthesis of 7,11-diarylspiro[5.5]undecane-1,9-dione by the Michael Condensation Under Ultrasound Irradiation in Aqueous and Organic Two Phase in the Presence of Phase-Transfer Catalyst

2008 ◽  
Vol 5 (7) ◽  
pp. 579-582 ◽  
Author(s):  
Ji-Tai Li ◽  
Xin-Li Zhai ◽  
Zhi-Ping Lin ◽  
Xiao-Hui Zhang
Keyword(s):  
Phase Transfer ◽  
Ultrasound Irradiation ◽  
Phase Transfer Catalyst ◽  
Efficient Synthesis ◽  
Two Phase ◽  
Michael Condensation

ACCELERATION OF SOLID–LIQUID TWO-PHASE REACTION BY MEANS OF ALUMINA-WATER-ULTRASOUND. A SUBSTITUTE FOR A PHASE TRANSFER CATALYST

1984 ◽  
Vol 13 (5) ◽  
pp. 725-728 ◽  
Author(s):  
Takashi Ando ◽  
Takehiko Kawate ◽  
Junko Ichihara (nee Yamawaki) ◽  
Terukiyo Hanafusa
Keyword(s):  
Phase Transfer ◽  
Phase Transfer Catalyst ◽  
Phase Reaction ◽  
Two Phase ◽  
Solid Liquid

scholarly journals First and efficient synthesis of 4-[((3,4-dihydroxybenzoyl)-oxy)methyl]-phenyl-β-D-glucopyranoside, an antioxidant from Origanum vulgare

2016 ◽  
Vol 81 (1) ◽  
pp. 23-28
Author(s):  
Yu-Wen Li ◽  
Cui-Li Ma
Keyword(s):  
Phase Transfer ◽  
Phase Transfer Catalyst ◽  
Efficient Synthesis ◽  
Origanum Vulgare ◽  
Triethylbenzylammonium Chloride ◽  
Polyphenolic Glycoside ◽  
Hydroxybenzyl Alcohol ◽  
Methyl Phenyl

4-(3,4-Dihydroxybenzoyloxymethyl)phenyl-O-?-D-glucopyranoside (DBPG, 1 ), a polyphenolic glycoside previously isolated from Oregano(Origanum vulgare L.) in 0.08% isolated yield, was synthesized in five chemical steps with 41.4% overall yield. First, 4-(hydroxymethylphenyl)-2,3,4,6-tetra-O-acetyl-b-D-glucopyranoside 4 was obtained in 53.2% yield by selective glycosylation of 4-hydroxybenzyl alcohol 3 with 2,3,4,6-tetra-O-acetyl-?-D-glucopyranosyl bromide 2 in a mixture of chlorobenzene and aqueous CsOH using triethylbenzylammonium chloride (TEBAC) as a phase transfer catalyst. Then, this product was esterified with 3,4-diacetoxylbenzoyl chloride 7 to generate 4-(3,4-diacetoxybenzoyloxy-methyl) phenyl 2,3,4,6-tetra-O-acetyl-b-D-glucopyranoside 8 in 95% yield. Finally, selectively global deacetylation of 8 was performed in a mixture of dibutyltin oxide and methanol under reflux to afford 1 in 94.8% yield.

Efficient Synthesis of Chromones with Alkenyl Functionalities by the Heck Reaction

2010 ◽  
Vol 63 (11) ◽  
pp. 1582 ◽  
Author(s):  
Tamás Patonay ◽  
Attila Vasas ◽  
Attila Kiss-Szikszai ◽  
Artur M. S. Silva ◽  
José A. S. Cavaleiro
Keyword(s):  
Heck Reaction ◽  
Halogen Atom ◽  
Phase Transfer ◽  
Bromine Atom ◽  
Tetrabutylammonium Bromide ◽  
Phase Transfer Catalyst ◽  
Efficient Synthesis ◽  
Terminal Alkenes

The usefulness of the Heck reaction in the field of chromones has been demonstrated. Bromochromones with the halogen atom in their rings A and B were reacted with various terminal alkenes to give hitherto unknown alkenyl‐substituted chromones. Reactivity of the substrates was found to markedly depend on the position of the bromine atom. Under phosphine‐free conditions using a phase‐transfer catalyst additive (tetrabutylammonium bromide), shorter reaction periods and usually higher yields were obtained.

ChemInform Abstract: Efficient Synthesis of Sulfones Using Polysorbate-80 as Phase-Transfer Catalyst.

ChemInform ◽  
2010 ◽  
Vol 23 (5) ◽  
pp. no-no
Author(s):  
G. K. BISWAS ◽  
M. CHAKRABARTY ◽  
P. BHATTACHARYYA
Keyword(s):  
Phase Transfer ◽  
Phase Transfer Catalyst ◽  
Polysorbate 80 ◽  
Efficient Synthesis
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