Abstract Vellozia compacta contains six new diterpenes of the pimarane type. Their structures were deduced on the basis of spectral data and chemical modification.
Oxidative cleavage of 1,2-glycols and α-hydroxy ketones with the ag]
作者:Jones reagent、Rosângela de A. Epifanio、Wilson Camargo、Angelo C. Pinto
DOI:10.1016/s0040-4039(00)82357-6
日期:1988.1
The oxidative cleavage of secondary-tertiary 1,2-glycols and α-hydroxy ketones with the Jones reagent proved to be a particularly useful synthetic procedure to form the corresponding ketoacids in excellent yields.
Synthesis of enantiomeric gibberellin analogs from natural isopimarenes
作者:Angelo C. Pinto、Rosângela de A. Epifanio、Wilson Camargo
DOI:10.1016/s0040-4020(01)81869-x
日期:1993.6
Gibberellane, Gibberellins, Isopimarane, Diterpenes. The natural isopimarenes 2–5, isolated from Velloziaceae species, with known absolute stereochemistry, were submitted to chemical transformations and afforded the tetracyclic lactones 10 and 11 with the gibberellane skeleton of the normal series. The 15-oxa-gibberellanes obtained are enantiomeric analogs of the natural gibberellins and this represents