Synthesis of the KLMN Fragment of Gymnocin-A Using Oxiranyl Anion Convergent Methodology
摘要:
Synthesis of the KLMN fragment of gymnocin-A has been achieved by a [X + 2 + Y]-type convergent strategy involving the coupling of a K-ring triflate and an N-ring epoxy sulfone. Fusions of the L ring and the M ring were carried out by intramolecular S(N)2 substitution of a tertiary alcohol and reductive etherification to furnish the target molecule.
Synthesis of the KLMN Fragment of Gymnocin-A Using Oxiranyl Anion Convergent Methodology
摘要:
Synthesis of the KLMN fragment of gymnocin-A has been achieved by a [X + 2 + Y]-type convergent strategy involving the coupling of a K-ring triflate and an N-ring epoxy sulfone. Fusions of the L ring and the M ring were carried out by intramolecular S(N)2 substitution of a tertiary alcohol and reductive etherification to furnish the target molecule.
Synthesis of the KLMN Fragment of Gymnocin-A from the FGH Fragment
作者:Takeo Sakai、Aoi Ishihara、Yuji Mori
DOI:10.1021/acs.joc.7b00232
日期:2017.4.7
An improved route for the synthesis of the KLMN fragment of gymnocin-A was developed through the oxiranyl anion coupling of the FGH fragment with a chiral C3 epoxy sulfone, followed by 6-endo cyclization. This straightforward approach reduced the number of synthetic steps by 14 compared with a previous route using alternative building blocks.