
pmid: 21588364
pmc: PMC3007289
El compuesto del título, C27H34O5 {nombre sistemático: benzoato de (4aR,5R,6R,6aS,7R,11aS,11bR)-4a ,6-dihidroxi-4,4,7,11b-tetra-metil-1,2,3,4,4a,5,6,6a ,7,11,11a ,11b-dodeca-hidrofenantro [3,2-b]furan-5-ilo}, es un furano oditerpeno de casano, que se aisló de las raíces de Caesalpinia pulcherrima. Los tres anillos deciclohexano están transfusionados: dos de ellos están en conformaciones de silla con el tercero en una conformación de media silla retorcida, mientras que el anillo de furano es casi plano (desviación r.m.s. = 0.003 Å). Una interacción C-H-O intramolecular genera un anillo S(6). Las configuraciones absolutas de los centros estereogénicos en las posiciones 4a, 5, 6, 6a, 7, 11a y 11b son R, R, R, S, R, S y R, respectivamente. En el cristal, lasmoléculas están unidas en cadenas infinitas a lo largo de [010] por enlaces de hidrógeno O-H. También se producen contactos cortos C O [3.306 (2) -3.347 (2) Å] y lasinteracciones C—H.
Le composé du titre, C27H34O5 {nom systématique : (4aR,5R,6R,6aS,7R,11aS,11bR)-4a ,6-dihydroxy-4,4,7,11b-tétra méthyl-1,2,3,4,4a ,5,6,6a ,7,11,11a ,11b-dodécahydrophénanthro[3,2-b] furan-5-yl benzoate}, est un cassane furan oditerpène, qui a été isolé à partir des racines de Caesalpinia pulcherrima. Les trois anneaux cyclohexane sont trans-fusionnés : deux d'entre eux sont en conformation chaise avec le troisième en conformation demi-chaise torsadée, alors que l'anneau furane est presque planaire (déviation r.m.s. = 0,003 Å). Une actionintermoléculaire C—H O génère un cycle S(6). Les configurations absolues des centres stéréogéniques aux positions 4a, 5, 6, 6a, 7, 11a et 11b sont R, R, R, S, R, S et R, respectivement. Dans le cristal, lesmolécules sont reliées en chaînes infinies le long de [010] par des liaisons hydrogène O—H 0. Il se produit également des contacts courts et des interac tions CH π [3,306 (2) -3,347 (2) Å].
The title compound, C27H34O5 {systematic name: (4aR,5R,6R,6aS,7R,11aS,11bR)-4a,6-dihydroxy-4,4,7,11b-tetramethyl-1,2,3,4,4a,5,6,6a,7,11,11a,11b-dodecahydrophenanthro[3,2-b]furan-5-yl benzoate}, is a cassane furanoditerpene, which was isolated from the roots of Caesalpinia pulcherrima. The three cyclohexane rings are trans fused: two of these are in chair conformations with the third in a twisted half-chair conformation, whereas the furan ring is almost planar (r.m.s. deviation = 0.003 Å). An intramolecular C—H⋯O interaction generates an S(6) ring. The absolute configurations of the stereogenic centres at positions 4a, 5, 6, 6a, 7, 11a and 11b are R, R, R, S, R, S and R, respectively. In the crystal, molecules are linked into infinite chains along [010] by O—H⋯O hydrogen bonds. C⋯O [3.306 (2)–3.347 (2) Å] short contacts and C—H⋯π interactions also occur.
المركب الرئيسي، C27H34O5 {الاسم المنهجي: (4aR، 5R، 6R، 6aS، 7R، 11aS، 11bR) -4a، 6 - dihy - droxy -4،4،7،11 b - tetramethyl -1،2،3،4،4a، 5،6،6 a، 7،11،11 a، 11b - dodeca hydro phenanthro [3،2 - b] furan -5 - yl benzoate}، هو كاسان فوران - oditerpene، والذي تم عزله عن جذور Caesalpinia pulcherrima. يتم دمج الحلقات الحلقية الهكسانية الثلاث: اثنتان منها في تطابقات الكرسي مع الثالثة في شكل نصف كرسي ملتوي، في حين أن حلقة الفوران مستوية تقريبًا (انحراف الجذر التربيعي = 0.003 Å). ينتج عن التفاعل داخل الجزيئات C - H - O حلقة S(6). التكوينات المطلقة للمراكز التجسيمية في المواضع 4 أ و 5 و 6 و 6 أ و 7 و 11 أ و 11 ب هي R و R و R و S و R و S و R على التوالي. في البلورة، ترتبط الجزيئاتفي سلاسل لا حصر لها على طول [010] بواسطة روابط الهيدروجين O- H - O. C+O [3.306 (2)–3.347 (2) Å] تحدث أيضًا تلامسات قصيرة وتفاعلات C - H + π.
Biological Activities of Diterpenoids from Medicinal Plants, Organic chemistry, Crystal (programming language), Organic Papers, Catalysis, Enantioselective synthesis, Stereochemistry, Biochemistry, Genetics and Molecular Biology, Health Sciences, Furan, Absolute configuration, Molecular Biology, Biosynthesis and Pharmacological Activities of Medicinal Natural Products, Pharmacology, Hydrogen bond, Biosynthesis and Engineering of Terpenoids, Crystallography, Molecule, Life Sciences, Stereocenter, Ring (chemistry), Computer science, Programming language, Chemistry, Sesquiterpene Synthases, QD901-999, Medicine
Biological Activities of Diterpenoids from Medicinal Plants, Organic chemistry, Crystal (programming language), Organic Papers, Catalysis, Enantioselective synthesis, Stereochemistry, Biochemistry, Genetics and Molecular Biology, Health Sciences, Furan, Absolute configuration, Molecular Biology, Biosynthesis and Pharmacological Activities of Medicinal Natural Products, Pharmacology, Hydrogen bond, Biosynthesis and Engineering of Terpenoids, Crystallography, Molecule, Life Sciences, Stereocenter, Ring (chemistry), Computer science, Programming language, Chemistry, Sesquiterpene Synthases, QD901-999, Medicine
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