Iodine-mediated formal [3 + 2] annulation for synthesis of furocoumarin from oxime esters
作者:Quyen T. Pham、Phong Q. Le、Ha V. Dang、Hiep Q. Ha、Huong T. D. Nguyen、Thanh Truong、Tri Minh Le
DOI:10.1039/d0ra07566c
日期:——
A novel synthesis of furocoumarins was developed by a reaction between oxime esters and 4-hydroxycoumarins. The reaction was proposed to undergo radical mechanism mediated by iodine, a cheap and common laboratory reagent. Mechanistic studies showed the key for the successful transformation was the presence of α-iodoimine intermediate which facilitated the ring-closing step. The developed conditions
Phosphine-Mediated MBH-Type/Acyl Transfer/Wittig Sequence for Construction of Functionalized Furo[3,2-<i>c</i>]coumarins
作者:Sandip Sambhaji Vagh、Bo-Jhih Hou、Athukuri Edukondalu、Pin-Ching Wang、Wenwei Lin
DOI:10.1021/acs.orglett.0c04082
日期:2021.2.5
A new method for the construction of functionalized furo[3,2-c]coumarins via MBH-type/acyl-transfer/Wittig reaction is reported. The current approach would open a new route for the simultaneous formation of two rings in a one-pot reaction which is accompanied by incorporation of a keto functionality on the furan ring by activating the terminal alkynoates with phosphine. Furthermore, this protocol could
报道了一种通过MBH型/酰基转移/ Wittig反应构建功能化呋喃[3,2- c ]香豆素的新方法。当前的方法将为在一锅法反应中同时形成两个环开辟新的途径,其伴随有通过用膦活化末端炔酸酯在呋喃环上并入酮官能团。此外,该方案还可以适用于内部炔酸/丙酰胺,通过排除酰基转移反应来生成2,3-二取代的呋喃[3,2- c ]香豆素/呋喃[3,2- c ]喹啉酮。
DABCO-Promoted One-Pot Facile Synthesis of Angularly Fused Furoquinolinones and Furocoumarins
作者:Monoranjan Ghosh、Alakananda Hajra
DOI:10.1002/ejoc.201501152
日期:2015.12
A DABCO-promoted intermolecular cyclization between enols and nitrostyrenes has been developed for the regioselective synthesis of angularlyfused furan derivatives in high yields. This protocol is applicable to various enol derivatives, including 4-hydroxyquinolinones, 4-hydroxycoumarin, and 4-hydroxypyranone.
Regioselective Access to Structurally Diverse Coumarin Analogues through Iron-Catalysed Annulation Reactions
作者:Qiao Ren、Jie Kang、Muyao Li、Lujiang Yuan、Ruoyun Chen、Lei Wang
DOI:10.1002/ejoc.201700999
日期:2017.10.10
A highly efficient iron-catalysed propargylation/alkyne oxacyclization/isomerization strategy is described. Biologically active furo[3,2-c]coumarins and pyrano[3,2-c]coumarins are expeditiously assembled with high regioselectivities.
描述了一种高效的铁催化的炔丙基化/炔基羰基化/异构化策略。具有高区域选择性的生物活性呋喃[3,2- c ]香豆素和吡喃并[3,2- c ]香豆素被迅速组装。
Metal-Free Synthesis of Furocoumarins: An Approach via Iodine-Promoted One-Pot Cyclization between 4-Hydroxycoumarins and Acetophenones
作者:Phuc H. Pham、Que T. D. Nguyen、Nhu K. Q. Tran、Vu H. H. Nguyen、Son. H. Doan、Hiep Q. Ha、Thanh Truong、Nam T. S. Phan
DOI:10.1002/ejoc.201800983
日期:2018.8.31
An iodine‐mediated one‐pot synthesis of furocoumarins has been developed. The furocoumarins were obtained in high yields in the presence of NH4OAc as an additive, whereas neither acidic nor basic additives were effective.