Lagerenyl acetate and lagerenol two tetracyclic triterpenoids with the cycloartane skeleton from Lagerstroemia lancasteri
TL;DR: In this article, the structures of lagerenyl acetate and Lagerenol with the cycloartane skeleton were established as 3β-acetoxycycloart-24-one and 3 β-hydroxymethylcarboxylate 24-one, respectively, on the basis of spectral and chemical evidence.
About: This article is published in Phytochemistry.The article was published on 1983-01-01. It has received 21 citations till now. The article focuses on the topics: Friedelin.
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TL;DR: A new triterpene, cycloart-23Z-enfe-3β,25-diol and other oxygenatedcycloartanes have been isolated from Juncus effusus and their configurations at C-24 have been attributed on the basis of chemical correlations.
94 citations
TL;DR: A compilation of the triterpenoids isolated during the period 1982–1989 along with their occurrence, available physical data, spectroscopy and X-ray analysis used for their characterization, is included.
85 citations
TL;DR: In this article, a property-activity relationship study of various palladium supported on charcoal (Pd/C) catalysts has been undertaken for the Heck reaction of aryldiazonium tetrafluoroborate with acrylates.
Abstract: A property-activity relationship study of various palladium supported on charcoal (Pd/C) catalysts has been undertaken for the Heck reaction of aryldiazonium tetrafluoroborate with acrylates. The optimized protocol enables the cross-coupling with a low loading of palladium at room temperature in technical grade methanol. Although the catalyst could not be recycled at this time, measurement of the palladium content by inductively coupled plasma mass spectrometry (ICP-MS) shows low palladium contamination of the solvent and product, rendering this method safer for the environment compared to homogeneous conditions.
74 citations
TL;DR: In this paper, a triterpenoidal sapogenin named curculigenin A, which was common to all the saponins, was identified as 3β,11α,16β-trihydroxycycloartane-24-one by mass spectrometry, 2D-NMR analysis and chemical evidence.
31 citations
TL;DR: From the orchid Cirrhopetalum elatum was isolated a new triterpene of the cycloartane series, which was shown to be 24-methylenecycloartanyl p -hydroxycinnamate from spectral and chemical evidence.
26 citations
References
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TL;DR: In this paper, the structures given to the two cis 2,3-diols resulting from osmium tetroxide oxidation of methyl oleana-2,12-dien-28-oate were revised.
Abstract: Application of N.M.R. methyl resonance data led to revision of the structures given to the two cis 2,3-diols resulting from osmium tetroxide oxidation of methyl oleana-2,12-dien-28-oate (10). 2α,3α-Dihydroxyolean-l2-en-28-oic acid (6a), a new natural product, occurs in Shorea acuminata resin. Other constituents are 2α-hydroxy-ursolic acid (14a), mangiferonic acid (15b), and asiatic acid (14c). S. resina-nigra contains β-amyrin (16a), ursolaldehyde (14f), and Ψ-taraxesterol(17a).
49 citations
TL;DR: In this paper, three new p-coumaroylates of alphitolic acid were isolated from the fruits of Zizyphus jujuba (Rhamnaceae) and were characterized to be 3-O-trans-p-coyl-, 2 O-transp-Coumaroysl-, and 3 O-cis-pcoumoyl alphitic acid on the basis of chemical and spectral evidence.
Abstract: Three new p-coumaroylates of alphitolic acid were isolated from the fruits of Zizyphus jujuba (Rhamnaceae) and were characterized to be 3-O-trans-p-coumaroyl-, 2-O-trans-p-coumaroyl- and 3-O-cis-p-coumaroyl alphitolic acid on the basis of chemical and spectral evidence.
47 citations
TL;DR: Rubicoumaric acid and rubifolic acid isolated from Rubia cordifolia have been shown to be 30-hydroxy-3β-p-Hydroxycoumaryloxy-urs-12-ene-28-oic acid or 3β,30-dihydroxy-urs 12-ene,28- oic acid respectively on the basis of 1H NMR, 13C NMR and mass spectral and chemical evidence.
34 citations
24 citations
TL;DR: Jacoumaric acid isolated from Jacaranda caucana is shown to be 2α-hydroxy-3β- trans-p -coumaryloxy-urs-12-en-28-oic acid.
22 citations