Total Syntheses of the Isomeric Aglain Natural Products Foveoglin A and Perviridisin B: Selective Excited‐State Intramolecular Proton‐Transfer Photocycloaddition
作者:Wenyu Wang、Anthony Clay、Retheesh Krishnan、Neil J. Lajkiewicz、Lauren E. Brown、Jayaraman Sivaguru、John A. Porco
DOI:10.1002/anie.201707539
日期:2017.11.13
intramolecular proton‐transfer (ESIPT) photocycloaddition of 3‐hydroxyflavones with trans, trans‐1,4‐diphenyl‐1,3‐butadiene is described. Using this methodology, total syntheses of the natural products (±)‐foveoglin A and (±)‐perviridisin B were accomplished. Enantioselective ESIPT photocycloaddition using TADDOLs as chiral hydrogen‐bonding additives provided access to (+)‐foveoglin A. Mechanistic studies
描述了3-羟基黄酮与反式,反式-1,4-二苯基-1,3-丁二烯的选择性激发态分子内质子转移(ESIPT)光环加成反应。利用该方法,完成了天然产物(±)-foveoglin A和(±)-perviridisin B的全合成。使用 TADDOL 作为手性氢键添加剂的对映选择性 ESIPT 光环加成反应提供了 (+)-foveoglin A 的途径。机理研究揭示了光诱导电子转移 (PET) 途径的可能性。