14-Hydroxycaryophyllene 4,5-oxide — A new sesquiterpene fromBetula pubescens
A new sesquiterpene — 14-hydroxycaryophyllene 4,5-oxide — has been isolated from the unsaponifiable part of an ethereal extract of the leaves ofBetula pubescens, and its structure has been established on the basis of chemical and spectral characteristics.
Studies of Australian soft corals. XXV. Several caryophyllene-based diterpenes from a Nephthea species
Two new caryophyllene-based diterpenes (5) and (6) are reported from the soft coral Nephthea chabrolii. The structures were deduced spectroscopically and the compounds were converted into several known diterpenes by chemical transformation. The presence of the caryophyllene ring system was based on 13C n.m.r. data and confirmed by conversion into the known clovane ring system by an acid-catalysed hydration-rearrangement of the endocyclic epoxide (12).
Catalytic removal of tert-butyldimethylsilyl (TBS) ether by PVP-I
Abstract A mild, efficient and rapid protocol the deprotection of alcoholic TBDMS ethers using PVP-1 as catalyst in methanol, the procedure of deprotection of various TBDMS ethers were found to be very convenient, easy work-up, high yielding.