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A versatile route to indolo(2,1- d )(1,5)benzodiazocine derivatives has been developed based on a free radical cyclization approach from 1-substituted indole derivatives with appropriately positioned haloacetamide functionalities. Fair yields of the indole- and dihydroindole-fused eight-membered...
The global electrophilicity index evaluated at the ground state of benzylating and acylating agents shows a quantitative linear relationship with the experimental substrate selectivity index evaluated for a series of Friedel–Crafts reactions. The theoretical scale correctly accounts for the...
An Fmoc-protected δ-sugar amino acid, prepared by oxidation of a glucosamine derivative, was coupled to three different tripeptide tert -butyl esters (H-Tyr-Tyr-Tyr-O t Bu, H-Tyr-Glu(OBzl)-Tyr-O t Bu and H-Tyr-Arg(Mtr)-Tyr-O t Bu) and the resulting sugar amino acid/amino acid hybrids were...
The configuration of the penta-tetrahydrofuranyl diol (penta-THF) product obtained by a single-step, RuO 4 -catalyzed oxidative polycyclization of squalene, has been determined as cis – threo – cis – threo – trans – threo – trans – threo – trans . The...
Aldehydes react readily with ethyl diazoacetate in the presence of 5 mol% of NbCl 5 in dichloromethane to produce the corresponding β-keto esters in good yields with high selectivity. This method is very useful for the preparation of β-keto esters from both electron-rich as well as...
This paper describes bis(3-(triethoxysilyl)propyl)tetrasulfide, which is the first liquid sulfur-transferring agent useful for the conversion of nucleoside phosphite intermediates in the synthesis of the phosphorothioates using a phosphoramidite strategy. This liquid reagent is preferable to...
Chemical investigation of the dichloromethane extract of the Red Sea marine sponge Lamellodysidea herbacea led to the isolation of seven new polychlorinated derivatives 3 – 6 and 8 – 10 in addition to the known dysidamide 1 , dysidamide B 2 and dysidamide C 7 . Their structures were...
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