The synthesis of heliannuol C, an allelochemical from Helianthus annuus
摘要:
The synthesis of the allelochemical heliannuol C I is described by employing a Bargellini condensation and a Claisen rearrangement to install the gem-dimethyl and vinyl functionalities, respectively. A Dieckmann cyclisation of diester 11 enabled the generation of the benzoxepane ring system enshrined in 1. (c) 2006 Elsevier Ltd. All rights reserved.
Bargellini condensation of coumarins. Expeditious route to o-carboxyvinylphenoxyisobutyric acids and application to the synthesis of sesquiterpenes helianane, heliannuol A and heliannuol C
作者:Bidyut Biswas、Prabir K. Sen、Ramanathapuram V. Venkateswaran
DOI:10.1016/j.tet.2007.09.006
日期:2007.11
The direct Bargellini condensation of coumarins involving reaction with chloroform and acetone in the presence of aqueous sodium hydroxide furnished o-carboxyvinylphenoxyisobutyric acids in good yields. The utility of this new useful protocol was demonstrated by the transformation of the three diesters 9b, 9f and 9g to the sesquiterpenes helianane 4, heliannuol A 2 and heliannuol C 3, respectively
香豆素的Bargellini直接缩合反应涉及在氢氧化钠水溶液存在下与氯仿和丙酮反应,从而以良好的收率提供了邻羧基羧乙烯基苯氧基异丁酸。通过将三个二酯9b,9f和9g分别转化为倍半萜烯helaneane 4,heliannuol A 2和heliannuol C 3,证明了该新有用方案的实用性。
Synthesis of (±)-heliannuol C
作者:Bidyut Biswas、Prabir K. Sen、Amalesh Roy
DOI:10.1080/00397911.2017.1344860
日期:2017.9.17
ABSTRACT A synthesis of (±)-heliannuol C is described involving Bargellini condensation, Dieckmann cyclization and ortho-ester Claisen rearrangement followed by a regioselective epoxide reduction. A new CuI-catalyzed [2+2] cycloaddition reaction is also described. GRAPHICAL ABSTRACT
摘要描述了 (±)-heliannuol C 的合成,包括 Bargellini 缩合、Dieckmann 环化和原酸酯 Claisen 重排,然后是区域选择性环氧化物还原。还描述了一种新的 CuI 催化的 [2+2] 环加成反应。图形概要
On the Possibility of Tuning Molecular Edges To Direct Supramolecular Self-Assembly in Coumarin Derivatives through Cooperative Weak Forces: Crystallographic and Hirshfeld Surface Analyses
作者:Saikat Kumar Seth、Debayan Sarkar、Atish Dipankar Jana、Tanusree Kar
DOI:10.1021/cg2006343
日期:2011.11.2
(lone pair)···π interactions cooperatively take part. The recurring feature of the self-assembly in all the compounds is the appearance of the molecular ribbon through weak hydrogen bonding. These hydrogen bonded ribbons further stacked into molecular layers by π···π forces. The mode of cooperativity of the weak C–H···O and π···π forces is such that they operate in mutually perpendicular directions
The synthesis of heliannuol C, an allelochemical from Helianthus annuus
作者:Bidyut Biswas、Prabir K. Sen、Ramanathapuram V. Venkateswaran
DOI:10.1016/j.tetlet.2006.04.011
日期:2006.6
The synthesis of the allelochemical heliannuol C I is described by employing a Bargellini condensation and a Claisen rearrangement to install the gem-dimethyl and vinyl functionalities, respectively. A Dieckmann cyclisation of diester 11 enabled the generation of the benzoxepane ring system enshrined in 1. (c) 2006 Elsevier Ltd. All rights reserved.