By Alan R. Katritzky
Confirmed in 1960, Advances in Heterocyclic Chemistry is the definitive serial within the area--one of serious value to natural chemists, polymer chemists, and lots of organic scientists. Written through validated professionals within the box, the great reports mix descriptive chemistry and mechanistic perception and yield an realizing of the way the chemistry drives the homes.
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Extra resources for Advances in Heterocyclic Chemistry, Vol. 70
Similar products (72)could be obtained in moderate yield from 71 by treatment with Zn in acetic acid (84TL3247), or from the perhydro derivative (73)by selenium(1V) oxide elimination and subsequent treatment with Zn in acetic acid at 90°C (80JA1454). c/ N H M PhCOCl P NaOH I H20 Me0 e O d N--COPh SO& I CHCls Me0 Me0 Me0 Me0 (76) (77) 34 ISTVAN HERMECZ [Sec. A 2-(Tetrahydroisoquinol-l-yl)ethanols(74) could be converted by inversion into the epimers (77) by N-benzoylation, subsequent treatment of 75 with thionyl chloride, and hydrolysis of the tricycles (76) (92T4937).
The nonbridgehead nitrogen of perhydropyrido[ 1,2-c]pyrimidines (69JHC181) and their 3-0x0 (84EUP104647; 85JMC1285) and 1,3-dioxo derivatives (64JMC146; 87USP4680295) and 2,3-dihydro-lH-pyrid0[1,2c]pyrimidine-1,3-diones (57HCA1319), and that of 9,10-dimethoxy-3, 4,6,7-tetrahydro-2H- (77SAP77/06706; 78GEP2720085; 79GEP2801289; 80GEP2847693; 84JMC1470), 1,3,4,6,7,1lb-hexahydro-2H-pyrimido[6,1a]isoquinoline-2,4-diones (69YZ649; 84T4003; 90JOC5117), as well as that of 2,3,4,4a,5,6-1H-p yrimido[ 1,6-a]quinolin-1-ones (7OUSP3494922), has been alkylated, and the nonbridgehead nitrogen of perhydropyrido 44 ISTVAN HERMECZ [Sec.
5 and 281 nm for isomeric 2-(N-arylN-methylimino)-6,7-dihydro-4H-pyrimido[6,1-a]isoquinolin-4-ones(54) (84JMC1470). Ar Me0 Me0 5 . IR Spectra The appearance of Bohlmann bands in the IR spectrum of perhydropyrido[l,2-c]pyrimidine indicated that this compound exists predominantly in the trans-fused conformation (69JHC181), but the application of Bohlmann's IR criterion to perhydropyrido[ 1,2-c]pyrimidinesis greatly complicated by the presence of the two N atoms and in some cases the a-H atoms of the 2-alkyl group (70l701).