the marine natural product (+)-hemifistularin 3 in enantiomerically pure form was accomplished by using the amide forming reaction of (+)-spiroisoxazoline ester with the (+)-octopamine derivative. The stereodivergent strategy employed in this effort enabled the assignment of the absolute configurations at the three stereogenic centers in (+)-hemifistularin 3.
Total syntheses of (±)-aerothionin and (±)-homoaerothionin
作者:Shigeru Nishiyama、Shosuke Yamamura
DOI:10.1016/s0040-4039(00)86267-x
日期:1983.1
Both aerothionin and homoaerothionin, the novel metabolites of the sponges Aplysina aerophoba, A. fistularis and Verongia thiona, have been synthesized in racemic form.
Total Syntheses of (±)-Aerothionin, (±)-Homoaerothionin, and (±)-Aerophobin-1
作者:Shigeru Nishiyama、Shosuke Yamamura
DOI:10.1246/bcsj.58.3453
日期:1985.12
(±)-aerophobin-1 have been successfully synthesized using phenolic oxidation of the methyl pyruvate oxime derivative with thallium(III) trifluoroacetate as a key step. The stereostructure of aerophobin-2 has been also established by comparison of the 1H NMR spectrum with those of relatedcompounds.
Oxidative cyclisation of o-phenolic oxime-acid derivatives using phenyliodonium diacetate: Synthesis of spiroisoxazoline derivatives
作者:Masatoshi Murakata、Kohei Yamada、Osamu Hoshino
DOI:10.1016/0040-4020(96)00921-0
日期:1996.11
An efficient formation of spiroisoxazoline ring system by intramolecular oxidativecyclisation of o-phenolic oxime-esters and oxime-amides using phenyliodonium diacetate (PIDA) is described. The intramolecular oxidativecyclisation of various o-phenolic oxime-acid derivatives in acetonitrile at 0 °C proceeded smoothly to afford spiroisoxazolines in good yields. Synthesis of o-phenolic oxime-esters