A novel synthetic protocol for the synthesis of <i>pulvinones,</i> and naturally occurring <i>Aspulvinone E</i>, molecules of medicinal interest
作者:Kyriakos C. Prousis、Sotirios Katsamakas、John Markopoulos、Olga Igglessi-Markopoulou
DOI:10.1080/00397911.2021.2001662
日期:2022.1.2
Abstract A novel two step methodology for readily accessible natural “pulvinone” derivatives in excellent yields has been developed starting from activated precursors, bearing a functionalized 1,3-dioxolane-2,4-diones (OCA’s), as dually protected-activated synthons of α-hydroxy acids. The present procedure is based on a tandem C-acylation-cyclization process under mild conditions with good yields.
Synthesis and Cyclization of 3-Aryl-2-(arylacetoxy)acrylates: A Three-Step Access to Pulvinones
作者:Reinhard Brückner、David Bernier、Frank Moser
DOI:10.1055/s-2007-983800
日期:2007.7
17A- D. Esterification with phenylacetic anhydride or (4-methoxyphenyl)acetic acid/ N, N′-dicyclohexylcarbodiimide stereoselectively furnished 2-(arylacetoxy)-3-(4-methoxyphenyl)acrylates and thioacrylates ( Z)- 18A- D. Treating the latter with potassium TERT-butoxide induced Dieckmann condensations, which led to isomerically pure pulvinones 1G, H in up to 88% yield.
Silver-Catalyzed<i>tert</i>-Butyl 3-Oxopent-4-ynoate π-Cyclizations: Controlling the Ring Size—Hydroxypyrone or Pulvinone Formation—by Counterion and Additive Optimization
作者:David Hermann、Reinhard Brückner
DOI:10.1021/acs.orglett.8b03214
日期:2018.12.7
from arylacetylenes and the acid chloride of tert-butyl 2-phenylmalonate, represent strongly enolized β-ketoesters. Their C≡C bonds were activated by Ag(I) salts so that de-tert-butylating π-cyclizations occurred. The latter followed a 6-endo-dig mode giving 3,6-diaryl-4-hydroxy-2-pyrones, or a 5-exo-dig mode giving (Z)-configured 2-aryl-4-(arylmethylidene)tetronicacids (“pulvinones”). Perfectly selective
叔丁基2,5-二芳基-3-氧代戊-4- ynoates,从arylacetylenes得到和的酰氯叔丁基-2-苯基丙二,代表强烈烯醇化β酮酯。它们的C≡C键被Ag(I)盐激活,从而发生了叔丁基化π-环化反应。后者随后6-内-挖模式给予3,6-二芳基-4-羟基-2-吡喃酮,或5-外型-挖模式给予(ż)构型的2-芳基-4-(亚苄基)特窗酸(“ pulvinones”)。由AgSbF 6在甲醇中诱导完全选择性的吡喃酮形成,由Ag 2 CO 3诱导同样选择性的普维酮形成。 和DABCO的乙腈溶液。