1996
DOI: 10.1016/0031-9422(95)00735-0
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Two prenylated isoflavans from Millettia racemosa

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Cited by 14 publications
(8 citation statements)
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“…They suffer autocondensation or thermal decomposition, affording the formation of both oligomeric procyanidins and condensed and hydrolysable tanines 4,5 . As a result, despite the extensive occurrence of flavans in the vegetal kingdom, their phytochemical isolation is currently difficult 6 . Brosimum acutifolium, a vegetal species found in the high lands of the Amazon region is largely used in folk medicine for the treatment of rheumatism 7 .…”
Section: Introductionmentioning
confidence: 99%
“…They suffer autocondensation or thermal decomposition, affording the formation of both oligomeric procyanidins and condensed and hydrolysable tanines 4,5 . As a result, despite the extensive occurrence of flavans in the vegetal kingdom, their phytochemical isolation is currently difficult 6 . Brosimum acutifolium, a vegetal species found in the high lands of the Amazon region is largely used in folk medicine for the treatment of rheumatism 7 .…”
Section: Introductionmentioning
confidence: 99%
“…7‐Hydroxy‐4‐methyl coumarin, 6‐hydroxy‐4‐methyl coumarin, and 7,8‐dihydroxy‐4‐methyl coumarin were prepared by the Pechmann cyclization of the corresponding phenols with ethyl acetoacetate according to the literature reports .…”
Section: Methodsmentioning
confidence: 99%
“…4‐Chloro coumarins , 4‐bromomethyl coumarins , 3‐bromoacetyl coumarins , and 4‐bromomethyl‐1‐ aza ‐coumarins(carbostyrils) were synthesized in a two/three step sequence according to literature methods. Acetylenic dipolarophiles linked to hydroxy coumarins via an ether linkage have been prepared by the reaction of various hydroxy coumarins and propargyl bromides (Fig ).…”
Section: Chemistrymentioning
confidence: 99%
“…The main problem associated with this approach, as mentioned above, is the formation of pyranocoumarin by-products [29,42], and the extent to which these are formed appears to be dependent on the choice of base used in the reaction. Indeed, the undesired by-product can be obtained as the major component when DEA is used [40,41,43], whereas the use of NEF [37,43] gives furocoumarins exclusively.…”
Section: A13mentioning
confidence: 98%