Download Advances in Heterocyclic Chemistry, Vol. 70 by Alan R. Katritzky PDF

By Alan R. Katritzky

Tested in 1960, Advances in Heterocyclic Chemistry is the definitive serial within the area--one of serious significance to natural chemists, polymer chemists, and plenty of organic scientists. Written by way of confirmed specialists within the box, the great studies mix descriptive chemistry and mechanistic perception and yield an knowing of the way the chemistry drives the homes.

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ILC] PYRID0[1,2-c][1,3]0XAZINES, -THIAZINES, & -PYRIMIDINES, I1 21 drous liquid ammonia) in a 1 : l mixture of CS2-THF-d6. This enhanced chemical shift difference reflects both the /3-substituent effect of C-4 methylene and the generalized anomeric effect differences between the trans- and cis-conformers. 3 ppm was measured, which suggests the presence of a 38 :62 equilibrium mixture of the S-inside cis-fused and trans-fused conformations [830MR(21)203]. 6. X-Ray Investigations An X-ray structural determination of 1-(4-bromophenyI)perhydropyrido[l,2-b][1,3]thiazine revealed that both fused rings adopt almost ideal chair conformations (73MI2).

Treatment of r-4a,c-5a,t-9a-H-l-ethylideneperhydro[1,3]oxazino[3,4blisoquinoline (42) with water in methylene chloride gave 2-(rrans-perhydroisoquinolin-3-y1)ethyl propionate (80HCA1158). +- 0 A I HCI (65) 166) Me (67) A I HCI _____) R = H or valence bond Acidic hydrolysis of [1,3]oxazino[4,3-a]isoquinolin-2-one (65) and [1,3]oxazino[3,4-a]quinoline-3-ones(67) in boiling 5% hydrochloric acid 32 ISTVAN HERMECZ [Sec. A furnished 3-substituted 2,2-dimethylpropionic acids 66 and 68, respectively [66JCS(CC)262;67JCS(C)1569].

4. Ring Transformation The reaction of 6,7-dihydro-1H,3H,5~-pyrido[3,2,1-~][3,l]benzothiazine-1,3-dithione (103) with 1,3-diaminopropane afforded the tetracyclic compound (104) (78JHC645). 5 . Miscellaneous The electrochemical reduction of 4-(substituted imino)-1,2,4,5,6,11bhexahydro[1,3]thiazino[4,3-~]isoquinolines on a dropping Hg electrode was studied in the pH range 1-11 (87PHA858). c. PYRIDO[1,2-C]PYRIMIDINESA N D THEIRBENZODERIVATIVES 1. Ring Opening 2-(1-Aminocarbonyl-2-piperidy1)acetic acid was obtained from perhydropyrido[l,2-c]pyrimidine-l,3-dione by reaction with 30% aqueous KOH at 60-70°C (56CB1642).

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