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Indian Journal of Chemistry |
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Sect. B: Organic Chemistry including Medicinal Chemistry |
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VOL. 46B |
NUMBER 8 |
AUGUST
2007 |
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CONTENTS |
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Rapid Communication |
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1297 |
Development of aqua-soluble compounds based on vitamin A series molecules: Synthetic transformations of b -ionone |
b
-Ionyls bearing hydrophilic moieties like a
carbohydrate, amine, phosphate and amino acid are prepared and characterised.
Their aqua-solubilisation is examined by studying their absorption in
micelles. |
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Solomon Libsu
& Anil K Singh* |
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Papers |
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1303 |
Pinacol coupling of aromatic aldehydes and ketones mediated by TiCl4-Zn in ethyl acetate under ultrasound |
Zinc
powder can reduce titanium tetrachloride to the corresponding low valent
titanium complexes, which can promote coupling of some aromatic aldehydes and
ketones to the corresponding pinacols in 35-99% yield in ethyl acetate at
20-25°
C within 20-45
min. under ultrasound irradiation. |
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Ji-Tai Li*, Xue-Li Sun, Zhi-Ping Lin, |
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1308 |
An RCM based approach to (±
)-herbertene-1,14-diol and (±
)-tochuinyl
acetates |
Efficient
syntheses of title compounds is described. |
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A Srikrishna* & M Sreenivasa Rao |
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1318 |
Towards
the total synthesis of MKN-349A
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Ch
Maheedhara Reddy, R Vasu Dev, K Mukkanti &
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1322 |
Synthesis and antimicrobial evaluation
of some new 3-alkyl-, 3-(2¢
-naphthyl)-isocoumarins
and their (dl)-3,4-dihydroderivatives |
A convenient synthesis of some
new 3-alkyl-, 3-(2¢
-naphthyl)isocoumarins and their (dl)-3,4-dihydroderivatives has been carried out. Antimicrobial activity of all the synthesized
compounds is reported. |
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Zulfiqar Ali
Khan, Nasim Hasan Rama*, Muhammad Tahir Hussain & Gul Shahzada Khan |
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1328 |
An
efficient synthesis of 2-aminobenzochromene derivatives catalysed by
tetrabutylammonium-bromide (TBABr) under microwave irradiation in aqueous
medium |
TBABr
efficiently catalyzes the three-component coupling of substituted aldehyde, a
-naphthol
or ß-naphthol and malononitrile to afford the corresponding
2-aminobenzochromene, the new protocol under microwave irradiation works in
the absence of organic solvent, the yields are high and the reactions go to
completion within 2-3 min.
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M A
Päsha* & V P Jayäshankara |
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1332 |
Synthesis of
some new 1-(6-fluorobenzothiazol- |
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Ranjana Aggarwal*, Vinod Kumar &
Shiv P Singh |
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1337 |
Competitive
[3,3] sigmatropic rearrangement of aryl propargyl ether moiety vs propargyl vinyl amine part in 6-[N-(4′-aryloxybut-2-ynyl)N-methyl amino]coumarins |
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K C Majumdar*, T K Das
& B Chattopadhyay |
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Notes
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1343 |
Synthesis of
novel a
-arylpropionic
acids and their derivatives |
A series of 2-(6H-benzo[c]chromen-3-yl)propionic acids have been synthesized and evaluated for COX-2 inhibitor activity. |
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1347 |
An efficient C-C
bond cleavage of 1,2-diols using tetraethylammonium superoxide |
Tetraethylammonium
superoxide, generated in situ by
the phase-transfer reaction of potassium superoxide and tetraethylammonium
bromide in DMF, brings about an easy cleavage of vicinal diols and related
dihydroxy arenes under mild reaction conditions, at room temperature. |
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Krishna Nand Singh*, Rajesh Kumar & Ajay
Kumar Shukla |
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1352 |
New monoterpenoids from Dracocephalum forrestii aerial parts |
Dracocephalum forrestii (Lamiaceae) has been
used as astringent, diuretic and antipyretic in traditional Tibetan medicine.
Three new 2-hydroxyl substituted pinanone- type monoterpenoids, 2β,10-dihydroxy-3-pinanone
10-O-β-D-gluco-pyranoside
1, 2α,5α-dihydroxy
pinan-3-one 2, and 2α,5α-dihy-droxy-3-pinanone 5-O-β-D-glucopyranoside 3, are isolated from the whole
plant ofthis medicine. The
structures of compounds 1-3 are
determined by spectroscopic methods.
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Gan-Peng Li, Jing-Feng Zhao, Li-JuanYang,
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1355 |
Pyrrolidine
catalyzed regioselective and diastereoselective direct aldol reaction in
water |
Pyrrolidine is an efficient organocatalyst for the regioselective
direct aldol reaction in water affording high yields of linear aldol addition
product arising from the selective attack of the unsubstituted carbon of the
unsymmetrical ketone. |
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Dinesh Mahajan & Swapandeep Singh Chimni* |
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1359 |
Essential oil composition of Gliricidia sepium (Leguminosae) leaves and flowers |
The essential oils from the leaves and flowers of Gliricidia sepium are analysed by GC and GC-MS. The leaf oil contained 18% of coumarin making the leaves unsuitable for fumigation as a mosquito repellent. The flower oil contained both coumarin (43%) and hydroquinone (22%) suggesting its unsafe nature as a food material. |
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Molykutty M
Kaniampady, |
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1361 |
Facile
and efficient synthesis of 1,8-naphthyridinyl phthalazine-1,4-diones under
microwave irradiation |
Microwave-assisted solvent-free synthesis of 2-(3-aryl-1,8-naphthyridin-2-yl)-1,2,3,4-tetrahydro-phthalazine-1,4-diones has been described. |
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K Mogilaiah*, J Uma Rani & H Sharath Babu |
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1364 |
Constituents of
high altitude Himalayan herbs. Part XX. A C-19 ditwerpenoid alkaloid from Aconitum
balfourii |
A C19
diterpenoid alkaloid, 14-
benzoylpseudoconine 1 has been
isolated from the aerial parts of Aconitum balfourii by means of VLC and CARTLC methods and identified
by MS 1H, 13C NMR (SFORD and DEPT) as well as by
chemical analytical methods. |
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R= COC6H5 R= H |
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K S Khetwal |
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Authors for correspondence are indicated by (*) |
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