Zhu, J. Neuville, L.
Published in
Comprehensive Heterocyclic Chemistry III, 15-Volume Set
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 literature. The most abundant literature deals with [1,2,4]triazolo[3,4- b][1,3,4]thiadiazoles. T...
Published in
Comprehensive Heterocyclic Chemistry III, 15-Volume Set
Rachwal, S. Katritzky, A.R.
Published in
Comprehensive Heterocyclic Chemistry III, 15-Volume Set
Rapid progress in the synthetic application of benzotriazole derivatives in the last 20 years has resulted in over 1000 scientific papers on the subject. This fact is reflected in Section 5.01.7, which involves almost a half of the volume of this chapter. The section is arranged according to hybridization of the C-α atom and atomic numbers of the a...
Schwikkard, S.
Published in
Comprehensive Heterocyclic Chemistry III, 15-Volume Set
Mahajan, M.P. Mohan, C.
Published in
Comprehensive Heterocyclic Chemistry III, 15-Volume Set
Reports of bicyclic systems containing bridgehead nitrogen atoms and three extra heteroatoms in the same ring are rare. Only two new examples, 1 H-2,8a-diaza-1,3-dibora-naphthalene and 4a,8a,9,10-tetraaza-anthracene, have been reported as part of a theoretical study during the last decade. A brief overview regarding their structure determination, r...
Mahajan, M.P. Marwaha, A. Mohan, C.
Published in
Comprehensive Heterocyclic Chemistry III, 15-Volume Set
The chapter deals with the bicyclic 6-6 systems with one ring junction nitrogen atom containing two additional heteroatoms in each ring. Experimental methods including NMR spectroscopy, mass spectrometry, IR spectroscopy, and UV spectroscopy of the available compounds have been appropriately discussed. The variation in the chemical shift of the NH ...
Eckert, H.
Published in
Comprehensive Heterocyclic Chemistry III, 15-Volume Set
In the last 12 years only a few papers on eight-membered rings with one sulfur atom were published, but several methods for synthesizing fully conjugated thiocines and saturated thiocanes have been reported. Also some theoretical approaches have been developed which sometimes matched experimental facts.
Wong, H.N.C. Yeung, K.-S. Yang, Z.
Published in
Comprehensive Heterocyclic Chemistry III, 15-Volume Set
This chapter offers a comprehensive update of the literature on the reactivity of furans, benzo[ b]furans and benzo[ c]furans, dihydrobenzo[ b]furans and dihydrobenzo[ c]furans, dihydrofurans, tetrahydrofurans, and the reactivity of their substitutents appended to ring carbons. Emphasis is placed on the advances of existing reactions and the develo...
Aldabbagh, F.
Published in
Comprehensive Heterocyclic Chemistry III, 15-Volume Set
Bicyclic 5-6 heterocyclic systems with five heteroatoms distributed 2:3 or 3:2 among two fused rings and with no heteroatoms at ring junctions are reviewed. Reactions of azoloazines include at the nitrogen in which the coupling with sugars gave isosteres of purines. Nucleophilic substitutions at the fused trazinone, pyridazinone ring and substituti...
Ramsden, C.A.
Published in
Comprehensive Heterocyclic Chemistry III, 15-Volume Set
This chapter reviews progress since 1994 in the chemistry of bicyclic 5-6 heterosystems that have a total of six or seven ring heteroatoms. Systems with bridgehead heteroatoms are not included. Little progress has been made in this area since the subject was reviewed in CHEC-II(1996). Derivatives of four new systems have been reported since the las...
