Singlet-Oxygen-Mediated One-Pot Synthesis of 3-Keto-tetrahydrofurans from 2-(β-Hydroxyalkyl) Furans
摘要:
Photooxygenation of 2-(beta-hydroxyalkyl) furans affords, in one synthetic operation and in high yields, 3-keto-tetrhydrofuran motifs via intramolecular Michael-type addition to the 1,4-enedione intermediate.
Gold Catalysis: Biarylphosphine Ligands as Key for the Synthesis of Dihydroisocoumarins
作者:A. Stephen K. Hashmi、Benjamin Bechem、Annette Loos、Melissa Hamzic、Frank Rominger、Hassan Rabaa
DOI:10.1071/ch13552
日期:——
A gold-catalyzed phenol synthesis was successfully used in the synthesis of dihydroisocoumarins for the first time. A large number of gold(i) complexes were prepared and tested; only complexes based on the biarylphosphine motif were successful.
Functionalized 3(2H)-furanones via photooxygenation of (β-keto)-2-substituted furans: Application to the biomimetic synthesis of merrekentrone C
作者:Charis Gryparis、Ioannis N. Lykakis、Christina Efe、Ioannis-Panayotis Zaravinos、Theonymphi Vidali、Eugenia Kladou、Manolis Stratakis
DOI:10.1039/c1ob05567d
日期:——
Photooxygenation of (β-keto)-2-substituted furans leads, in a one pot operation, to functionalized 3(2H)-furanones with good to excellent yields. This methodology was applied as a key-step to the concise and biomimetic synthesis of the sesquiterpene merrekentrone C. The precursor to merrekentrone C, keto difuran, was synthesized using a cross coupling of α-iodo-3-acetylfuran with an alkenyl furan under Fenton-type conditions.
Photooxygenation of 2-(beta-hydroxyalkyl) furans affords, in one synthetic operation and in high yields, 3-keto-tetrhydrofuran motifs via intramolecular Michael-type addition to the 1,4-enedione intermediate.