The resin from Callitris quadrivalvis Vent. Decad. (Sandarac resin) has been shown to contain 6β-hydroxysandaracopimaric acid (6β-hydroxy-7-epipimara-9(14),19-dienoic acid).
Bardhan et al., Journal of the Chemical Society, 1956, p. 1346,1349
作者:Bardhan et al.
DOI:——
日期:——
Ochiai et al., Pharmaceutical Bulletin, 1957, vol. 5, p. 108,111
作者:Ochiai et al.
DOI:——
日期:——
Construction of Phenanthrenes and Chrysenes from β-Bromovinylarenes via Aryne Diels–Alder Reaction/Aromatization
作者:Vikram Singh、Ram Subhawan Verma、Anil K. Khatana、Bhoopendra Tiwari
DOI:10.1021/acs.joc.9b01644
日期:2019.11.1
A highly efficient transition-metal-free general method for the synthesis of polycyclic aromatic hydrocarbons like phenanthrenes and chrysenes (and tetraphene) from β-bromovinylarenes and arynes has been developed. The reactions proceed via an aryne Diels-Alder (ADA) reaction, followed by a facile aromatization. This is the first report on direct construction of chrysenes (and tetraphene) using the