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The synthesis of two heterobifunctional 4,4′-dimethoxytrityl derivatives carrying a N-hydroxysuccinic acid group as active ester in para 5a or meta position 5b is described. While 5a has been synthesized previously via six steps a novel and more efficient , four step synthesis for both...
The reaction of acylsilane-enolates with benzaldehyde gives rise to α-benzoyloxy-γ-hydroxysilanes in a reaction cascade involving aldol addition, hemiacetal formation, stereospecific intramolecular Cannizarro type disproportionation, and transesterification. This reaction pathway is supported...
Different methods for the coupling of 2-(4-pyridyl)thiophene to a-dibrominated thiophene oligomers and their efficiency to produce a homologous series of extended di(4-pyridyl)thiophene oligomers have been studied. The coupling was found to be most efficient with the organozinc derivative of...
A general approach is outlined here for the synthesis of hydroxyethylene dipeptide isostere ( 1 ) starting from D-glucose which can be employed to introduce any group at P 1 or P 1 , positions of such isosteres. A highly stereoselective synthesis of ( 2R ,4 S )- N -Boc- O...
A method is described for constructing totally rigid triad (nichromophoric) systems, D 2 -B 1 -D 1 -B 2 -A, in which the chromophores D 2 (= dimethylaniline), D 1 (= 1,4-dimethoxynaphthalene), and A (= dicyanovinyl) are fused to rigid hydrocarbon bridges, B 1 and B 2 , comprising linearly fused...
The isomerization of β-caryophyllene (3), under treatment with SeO2, is described. Chemical correlations, between 3 14--hydroxy-β-caryophylllene (6z) from Juniperus oxycedrus , are establised. High resolution 1H NMR spectra and analysis by molecular mechanics of 3, 6 and...
The method of sieve formula based on the principle of inclusion and exclusion of non valid configurations is developed for the enumeration of stable stereoisomers of polyalcohols. An application is shown in the series of deoxyalditols C n H n +3 ( OH ) n −1 where 3≤n≤10.
Deprotonation of N -isopropyl-diphenylketenimim 1 maybe achieved by surplus strong organic base (2,2,6,6-tetramethylpiperidine, n-butyllithium, potassium tert. butylate in tert. butyhnethyl ether). The resulting organometallic suspension is investigalled by means of fWpingreactions using various...
Two new β-carboline alkaloids, xestomanzamine A ( 1 ) and xestomanzamine B ( 2 ), and a new manzamine-type alkaloid, manzamine X ( 3 ), were isolated as cytotoxic constituents from an Okinawan marine sponge of Xestospongia sp. Another new manzamine-type alkaloid, manzamine Y( 4 ), was isolated...
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