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.
作者:Takeo Sakai、Hideaki Sakakibara、Yumi Omoto、Marina Tsunekawa、Yoshinori Hadano、Shota Kato、Yuji Mori
DOI:10.1021/acs.orglett.9b02502
日期:2019.9.6
synthesis is the bromoketone cyclization reaction on the oxepane ring to construct the fused bisoxepane GH ring. The second key step is the introduction of the trans-4-hydroxy-3-methyloxepane J ring via addition of trimethylaluminum to a conjugated oxonium moiety, followed by diastereoselective epoxidation and regioselective reduction.