p-TsOH-Catalyzed one-pot transformation of di- and trihydroxy steroids towards diverse A/B-ring oxo-functionalization
作者:Antara Sarkar、Jayanta Das、Pranab Ghosh
DOI:10.1039/c7nj01878a
日期:——
A solid support-mediated p-TsOH-catalyzed milder transformative protocol was developed to furnish diverse ring-A and/or ring-B oxo-functionalized steroids. To furnish interesting isomers involving the A/B-ring of biomolecules in a one-pot approach, only solid supports (and not solution!) were found to be effective. p-TsOH/SiO2-oxidation of 4β-hydroxycholesterol, the major oxysterol in human circulation
Minor C29-steroids from the marine red alga, Gracilaria edulis
作者:B. Das、K.V.N.S. Srinivas
DOI:10.1016/0031-9422(92)83292-7
日期:1992.7
Abstract Four minor C 29 -steroids, poriferast-5-en-3β-ol (clionasterol), 3β-hydroxyporiferast-5-en-7-one, poriferast-5-en-3β,7α-diol and poriferasta-3,5-diene-7-one were isolated from the marineredalga, Gracilariaedulis . This is the first report of the characterization of the last three compounds from a natural source and of the first compound from a species of Gracilaria .