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This chapter reviews bicyclic systems containing two fused five-membered rings with one bridgehead nitrogen and two other heteroatoms (nitrogen, oxygen, and sulfur) in each ring. Among the possible structural backbones, 16 have been so far found in the lit ...
The first catalytic method for the cyclization of vinyl-cyclopropyl ketones (formal homo-Nazarov reaction) is reported. Starting from activated cyclopropanes, heterocyclic and carbocyclic compounds were obtained under mild conditions using Brønsted acid ca ...
The first condensed-phase preparation of ternary P-Ch-X cations (Ch=O-Te, X=F-I) is reported: [P5S3X2]+, [P5S2X2]+, and [P4S4X]+ (X=Br, I). [P5S3X2]+ is formed from the reaction of the Ag+/PX3 reagent with P4S3. The [P5S3X2]+ ions have a structure that is ...
The double-arom. character of selected monocyclic carbon, boron, and borocarbon rings is demonstrated by refined nucleus-independent chem. shift (NICS) analyses involving the contributions of individual canonical MOs and their out-of-plane NICS tensor comp ...
2007
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Novel chemical compounds of the general formula KA, in which K is a 5- or 6- membered heterocyclic ring having 1-3 hetereo atoms, which can be independently N, S, or 0 with the proviso that at least one of the hetereo atoms must be a quaternized n ...
The Nazarov cyclization of divinyl ketones gives access to cyclopentenones. Replacing one of the vinyl groups by a cyclopropane leads to a formal homo-Nazarov process for the synthesis of cyclohexenones. In contrast to the Nazarov reaction, the cyclization ...
By simply heating a toluene soln. of isocyanoacetamide, amine, and aldehyde, a clean three-component reaction occurred to provide the 6-azaindolines and pyrrolidinone-fused 6-azaindolines. E.g., heating a mixt. of morpholine, heptanal, and isocyanoacetamid ...
2005
A novel three-component synthesis of tetrahydrofuro[2,3-c]pyridines I (R1 = PhCH2; R2 = EtO2C; R3 = Me2CH, n-hexyl, PhCH2CH2, 4-O2NC6H4, etc.; R4R5N = morpholino, piperidino, pyrrolidino, diethylamino) from readily accessible starting materials is describe ...
2004
To clone novel type 1 Baeyer-Villiger monooxygenase (BVMO) genes, we isolated or collected 25 bacterial strains able to grow on alicyclic compounds. Twelve of the bacterial strains yielded polymerase chain reaction (PCR) fragments with highly degenerate pr ...
2003
The attempt to prep. hitherto unknown homopolyat. cations of sulfur by the reaction of elemental sulfur with blue S8(AsF6)2 in liq. SO2/SO2ClF, led to red (in transmitted light) crystals identified crystallog. as S8(AsF6)2. The X-ray structure of this salt ...
