19464-87-0Relevant academic research and scientific papers
Vicinal dianion of triethyl ethanetricarboxylate: Syntheses of (±)-lichesterinic acid, (±)-phaseolinic acid, (±)-nephromopsinic acid, (±)-rocellaric acid, and (±)-dihydroprotolichesterinic acid
Pohmakotr, Manat,Harnying, Wacharee,Tuchinda, Patoomratana,Reutrakul, Vichai
, p. 3792 - 3813 (2007/10/03)
The vicinal dianion 2 derived from triethyl ethanetricarboxylate reacted regioselectively with aldehydes and ketones at C(β) to provide paraconic acid derivatives 5a-f in moderate to high yields as mixtures of diastereoisomers. The paraconic acid derivatives 5e and 5f were utilized as the starting materials for the syntheses of (±)-lichesterinic acid (12), (±)-phaseolinic acid (13), (±)-nephromopsinic acid (14), (±)-rocellaric acid (15), and (±)-dihydroprotolichesterinic acid (16).
Total synthesis of (±)-dihydroprotolichesterinic acid and formal synthesis of (±)-Roccellaric acid by radical cyclisation of an epoxide. Using a transition-metal radical source
Mandal, Pijus Kumar,Roy, Subhas Chandra
, p. 11395 - 11398 (2007/10/03)
A short and efficient total synthesis of (±)-Dihydroprotolichesterinic acid (1) and Formal synthesis of (±)-Roccellaric acid (2) has been achieved by radical cyclisation of epoxide using a transition metal radical source.
Efficient total syntheses of (±)protolichesterinic acid and (±)rocellaric acid via tungsten-π-allyl complexes
Chen, Ming-Jung,Liu, Rai-Shung
, p. 9465 - 9468 (2007/10/03)
Total syntheses of racemic protolichesterinic acid (1) and rocellaric acid (2) were achieved with the use of tungsten-π-allyl complex in the key step. In this synthetic route, compounds 1 and 2 were prepared in four and six steps respectively starting from readily available chloropropargyl derivatives.
Contribution to the Chemistry of Proto- and allo-Proto-lichesterinic Acids
Huneck, Siegfried,Takeda, Reiji
, p. 842 - 854 (2007/10/02)
The isolation and spectroscopic characterization of (-)-allo-proto-lichesterinic acid from Cetraria komarovii is described.Proto-lichesterinic and allo-proto-lichesterinic acids are transformed into numerous nitrogen-containing derivatives and the isomerization of the dihydro acids is investigated. Key words: Proto-lichesterinic Acid, allo-Proto-lichesterinic Acid, Lichen Substances
