S V Kessar
Articles written in Journal of Chemical Sciences
Volume 88 Issue 3 June 1979 pp 191-196 Organic
It has been shown that the KNH2/NH3 cyclisation of ortho/meta halogenated Schiff bases, or the corresponding dihydro compounds, succeeds when 1,2-naphthynes and 2,3-pyridynes are involved as intermediates. Using this procedure 3-aza-benzo[j]phenanthridine, 9-azaphenanthridine and 2,11-diazachrysene have been synthesized.
Volume 93 Issue 4 May 1984 pp 565-572 Organic Chemistry
Synthetic utility of photoinduced intramolecular hydrogen transfer reactions of ketones, amides, imines, nitrites and nitro compounds is highlighted by illustrative examples. Role of light-initiated electron transfer from amines, mercaptans, aryl groups and from lithiated ketones, amides and imines in reactions of synthetic interest is discussed.
Volume 100 Issue 2-3 April 1988 pp 217-222
KNH2/NH3 cyclisations of some alkoxy substituted arylhalides proceed in poor yields. This shortcoming may be overcome by the use of LDA/THF to effect the ring closure which may occur through benzyne or radical intermediates. Besides ortho halogenated dihydroanils and amides, the cyclisation of the benzylamine Schiff bases also provides a convenient route to isoquinoline alkaloids.
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