منابع مشابه
Enantioselective formal synthesis of ent-rhynchophylline and ent-isorhynchophylline.
Starting from (S)-tryptophanol, a formal synthesis of ent-rhynchophylline and ent-isorhynchophylline, involving stereoselective cyclocondensation, spirocyclization, and alkylation reactions, and the final adjustment of the oxidation level at the oxindole and piperidine moieties, is reported.
متن کاملent-Atisane and ent-kaurane diterpenoids from Isodon rosthornii.
A new ent-atisanoid (1) and three new ent-kauranoids (2-4) belonging to different types, along with four known compounds were isolated from Isodon rosthornii. Their structures were established by means of extensive spectroscopic analysis. The absolute configuration of 1 was further determined by X-ray diffraction. Compounds 1 and 5 are the first example of atisane-type diterpenoid from this plant.
متن کاملNew ent-abietane and ent-kaurane diterpenoids from Isodon rubescens.
Five new ent-abietane diterpenoids, ent-abierubesins A-E (1-5), and two new ent-kauranoids, hubeirubesins A and B (6, 7), together with three known diterpenoids (8-10), were isolated from the aerial parts of Isodon rubescens. Their structures were identified by means of extensive spectroscopic analysis, and the absolute stereochemistry of 1 was determined by single-crystal X-ray diffraction exp...
متن کاملSynthesis of an ent-halimanolide from ent-halimic acid.
An efficient synthesis of ent-halimanolide 2 (15,16-epoxy-12-oxo-ent-halima- 5(10),13(16),14-trien-18,2beta-olide), from ent-halimic acid has been achieved, corroborating the structure of the natural compound and establishing its absolute configuration.
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ژورنال
عنوان ژورنال: BMJ
سال: 1982
ISSN: 0959-8138,1468-5833
DOI: 10.1136/bmj.284.6333.1951-d