An article Unusual Epimerization in Styryllactones: Synthesis of (-)-5-Hydroxygoniothalamin, (-)-5-Acetylgoniothalamin, and O-TBS-Goniopypyrone WOS:000505078800031 published article about STYRYL-LACTONES in [Kotammagari, Tharun K.; Paul, Sayantan; Bhattacharya, Asish K.] Natl Chem Lab, CSIR, Div Organ Chem, Dr Homi Bhabha Rd, Pune 411008, Maharashtra, India; [Kotammagari, Tharun K.; Paul, Sayantan; Bhattacharya, Asish K.] Natl Chem Lab, CSIR, Acad Sci & Innovat Res AcSIR, Dr Homi Bhabha Rd, Pune 411008, Maharashtra, India in 2019.0, Cited 26.0. The Name is 4-Nitrobenzoic acid. Through research, I have a further understanding and discovery of 62-23-7. Application In Synthesis of 4-Nitrobenzoic acid
(-)-5-Hydroxygoniothalamin, (-)-5-acetylgoniothalamin, and (+)-5-hydroxygoniothalamin, isolated from the Goniothalamus genus, are synthesized from triacetyl-O-D-glucal by employing the Ferrier reaction, Mitsunobu reaction, and Jones oxidation as key steps. The synthetic procedure also yields the epimers of (-)-5-hydroxygoniothalamin and (+)-5-hydroxygoniothalamin employing acid-mediated transition-metal-free epimerization at C-5 of styryllactones. Further studies reveal that the epimerization is facilitated by the phenyl group present on the styryllactones. Also, depending on the dihydroxylation reaction conditions, various analogues of saturated styryllactones are synthesized utilizing oxa-Michael reaction conditions.
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Reference:
Phthalazine – Wikipedia,
,Phthalazine | C8H6N2 – PubChem