Showing papers in "Tetrahedron in 1995"

TL;DR: Introduction 13103 CationicSequences 13104 Anionic Sequences 13106 3a.

TL;DR: The N-terminal Fmoc group is retained on the final oligomer, following HF cleavage and deprotection, providing a convenient lipophilic handle for HPLC purification.

TL;DR: In this article, the TEMPO-mediated oxidation of methyl α-D- glucopyranoside to sodium methyl α -D-glucopyranoiduronate was studied.

TL;DR: In this paper, the use of one equivalent of DDQ provides a one-pot method for the synthesis of 1 H -benzimidazoles, and in the latter case it provides a novel 1 H-benzene-1,2-diamines.

TL;DR: In this article, 1,4-dihydropyridines are readily oxidized by manganese dioxide or 2,3-dichloro-5,6-dicyano-1, 4-benzoquinone (DDQ) in dichloromethane at room temperature.

TL;DR: In this paper, geodiamolide G (II), hemiasterlin A (12), hemeasterlin B (13), criamide A (14) and Criamide B (15) were solved via speciroscopic analysis and chemical degradation.

TL;DR: In this paper, the asymmetric dihydroxylation procedure (AD) is applied to a variety of polyenes and the observed selectivities are rationalized in terms of electronic and/or steric effects inherent to the substrate, superimposed on the substrate's favorable or unfavorable interactions with the binding pocket of the AD ligand.

TL;DR: The antimicrobial agent phomopsichalasin represents the first cytochalasin-type compound with a three ring system replacing the cy tochalasin macrolide ring.

TL;DR: In this paper, O-benzoyl hydroxamic acid derivatives react with tributylstannane in the presence of AIBN to give iminyl, amidyl, and carbamyl radicals which can be captured by an internal olefin

TL;DR: In this paper, an alternative way for performing Suzuki reactions is presented, where the necessary borate which is the actual nucleophile in these palladium catalyzed C-C-bond formations is prepared from 9-methoxy-9-bora-bicyclo[3.3]nonane (9-OMe- 9-BBN) and a polar organometallic reagent RM, and not as usually from a borane and a base.

TL;DR: In this paper, four phytoalexins, designated phytucassanes A, B, C and D, were isolated from rice leaves infected with Magnaporthe grisea (previously designated Pyricularia oryzae ) and from rice stems infected with Rhizoctonia solani.

TL;DR: In this paper, cyclodextrin dimers strongly bind substrates with the correct geometry in water solution and anti-hydrophobic agents help clarify the factors involved in their binding.

TL;DR: Tungsten-bipyridine complexes, generated in situ, catalyse the allylic alkylation of isocinnamyl methyl carbonate by dimethyl sodiomalonate [NaCH(CO2CH3)2] with complete syn-stereoselectivity as discussed by the authors.

TL;DR: In this article, the side chain e-amino group of Boc-l-lysine methyl ester or γ-carboxyl group was coupled to a redox moiety (transition-metal chromophore, electron donor, electron acceptor, metal ligand, or triplet-energy transmitter) using 4-(dimethylamino)pyridine, (1-benzotriazoleoxy)tris(dimethyamino)phosphonium hexafluorophosphate, N-methylmorpholine, and

TL;DR: Four new antiinsectan indole alkaloids have been isolated from organic extracts of the sclerotioid ascostromata of Eupenicillium shearii and show potent activity in dietary assays against the corn earworm Helicoverpa zea and the dried-fruit beetles.

TL;DR: In this paper, a comparison of experimental and predicted (AM1, STO3G, 321-G ∗ ∗, 631 G ∗∗ ) dipole moments of benzene derivatives is presented.

TL;DR: The use of base-labile acyl-type nucleobase protecting groups and of a succinyl-linked solid-support offers a synthetic strategy similar to standard oligonucleotide synthesis conditions that has been successfully applied for the synthesis of PNAs of mixed base sequence.

TL;DR: In this paper, a method for the synthesis of bisphosphines containing homochiral carbon backbones is described, which involves sequential reaction of a homchiral ditosylate with the appropriate dialkyl- or diary lphosphine-borane anion followed by BH3 decomplexation mediated by HBF4·OMe2.

TL;DR: A high intrinsic preference for the 2′-, as opposed to 3′- or 5′-, isomer was also observed in the specific case of guanosine monophosphate transport effected by the cytosine-bearing carrier 8b.