Sesquiterpene Research Articles

SELINANE-TYPE SESQUITERPENES. ACOLAMONE AND ISOACOLAMONE

Abstract Isolation of two new selinane-type sesquiterpenes, named acolamone (II) and isoacolamone (III), is described and their structures have also been elucidated in connection with the base catalyzed cyclization of an epoxygermacrone (IV), which has been derived from preisocalamendiol, leading to the formation of a selinane-type α,β-unsaturated ketone (V).

THE CONSTITUENTS OF ARCTIUM LAPPA L

Abstract Ten components including two new sesquiterpenes have been isolated from the leaves of Arctium lappa L. The new compounds, dehydrofukinone (I) and arctiol (II) proved to be Δ9(10)-fukinone and 8α-hydroxyeudesmol respectively.

A new sesquiterpene hydroxylactone from Ferula oopoda

A new sesquiterpene hydroxylactone from Ferula oopoda

A synthon for sesquiterpenes related to tricyclene

A synthon for sesquiterpenes related to tricyclene

Lactone fromInula germanica

The substance is soluble in ethanol, ether, benzene, and chloroform, and sparingly soluble in carbon te t rachlor ide and water; it d issolves readi ly in alkalis in the cold (consuming 2 g-eq of alkali). On hydrogenation in ethanol with PtO 2 (according to Adams), a tetrahydro der ivat ive was obtained with the composit ion C20H300~, mp 166-168 ° C; the dehydrogenation of the substance over Se at 310-330 ° C for 15 min yielded chamazulene. All these facts indicate that the isolated substance is a sesqui terpene Tlactone containing an es te r group. The study of the substance is continuing.

Revised structure and synthesis of the sesquiterpene calameon (calamendiol)

Revised structure and synthesis of the sesquiterpene calameon (calamendiol)

A new isoxazole annelation; application to the synthesis of dehydrofukinone

The eremophilonoid sesquiterpene dehydrofukinone has been synthesised via isoxazole annelation.

Studies in sesquiterpenes—XXVII: Differential Kuhn-Roth C-methyl estimation

A method, based on Kuh-Roth C-me estimation at two different temperatures, is described which yields useful information about the number and nature of quaternary methyls in isoprenoids, especially sesquiterpenes.

The structure and stereochemistry of a new sesquiterpene of the acorane type

The structure and stereochemistry of a new sesquiterpene of the acorane type

Isolation and structures of three new sesquiterpenes

Isolation and structures of three new sesquiterpenes

Studies on sesquiterpenoids. Part XVII. Total synthesis of (±)-lindestrene

9-Methyl-Δ5(10)-octalin-1,6-dione has been converted into 4,4a,5,6,8a,9-hexahydro-3,8a-dimethyl-5-methylenenaphtho[2,3-b]furan, which is identical (i.r., g.l.c.) with (±)-lindestrene, a furan sesquiterpene previously isolated from Lindera strychnifolia Vill.

The constituents of cacalia decomposita A. Gray—IV : Structure of decompostin

Decompostin, a constituent of Cacalia decomposita A. Gray has been shown to be a sesquiterpene of eremophylane series with structure Ia.

The structure of petasitin, a new sesquiterpene from [formula omitted] maxim.

The structure of petasitin, a new sesquiterpene from [formula omitted] maxim.

Euparotin acetate is a sesquiterpene

Euparotin acetate is a sesquiterpene

Sesquiterpenes of Neolitsea zeylanica Merr.—III : Structure of Zeylanine, Zeylanicine and Zeylanidine

Zeylanine, Zeylanicine and Zeylanidine, three new sesquiterpenes isolated from Neolitsea zeylanica Merr. are assigned structures III, V and VI respectively on the basis of spectral and degradation evidence.

Sesquiterpenes of neolitsea zeylanica merr.—I : Isolation of some constituents

From the roots of Neolitsea Zeylanica six sesquiterpenes, linderalactone, linderane, neolinderane, zeylanine, zeylanicine and zeylanidine, have been isolated. The chemistry of the first two compounds is discussed.

Sesquiterpenes of neolitsea zeylanica merr.—II : Structure of neolinderane

Neolinderane, a new sesquiterpene constituent of Neolitsea Zeylanica Merr. is assigned structure I on the basis of spectral and degradation evidence.

Structure of α-ferulene a sesquiterpene having a (+)-aristolane skeleton

Structure of α-ferulene a sesquiterpene having a (+)-aristolane skeleton

Constituents of Iva Species. III. Structure of Microcephalin, A New Sesquiterpene Lactone1,2

Constituents of Iva Species. III. Structure of Microcephalin, A New Sesquiterpene Lactone^1,2

Constituents of Iva Species. II. The Structures of Asperilin and Ivasperin, Two New Sesquiterpene Lactones1

Constituents of Iva Species. II. The Structures of Asperilin and Ivasperin, Two New Sesquiterpene Lactones¹