Tetrahydro conformation

Dibenzo[a,d]cyclooctene, 5,6,7,12-tetrahydro-Dibenzo[a,d]cyclooctene, 5,6,7,12-tetrahydro-conformation, 7, 706... 

Dibenzo[b,/][l,5]diazocine, tetrahydro-conformation, 7, 704 Dibenzo[b,/][l,4]diazocinediones synthesis, 7, 675 Dibenzodioxin, 2,7-dichloro-toxicity, 3, 992 Dibenzodioxin, hexachloro-toxicity, 3, 992 Dibenzodioxin, octachloro-toxicity, 3, 992... 

L-Folic acid, 5,10-methenyl-5,6,7,8-tetrahydro-conformation, 3, 281 L-Folic acid, 5,6,7,8-tetrahydro-conformation, 3, 281 Folpet... 

Furano( 1,4)naphthalenophane conformation, 4, 538 Furanonaphthalenophanes molecular structure, 4, 5 Furan-2-one, tetrahydro-reactions, 4, 656... 

Oxadiazine, tetrahydro-conformation, 3, 1054 ring-chain tautomerism, 3, 1056... 

Pterin, 6,7-dimethyl-5,6,7,8-tetrahydro-configuration, 3, 281 conformation, 3, 281 Pterin, 6,7-diphenyl-chlorination, 3, 296 methylation, 3, 297 reduction, 3, 307 Pterin, 6,7-diphenyl-5,6-dihydro-properties, 3, 306 UV spectrum, 3, 279 Pterin, 6-ethyl-5,6,7,8-tetrahydro-configuration, 3, 281 Pterin, 6-formyl-synthesis, 3, 318 Pterin, 6-formyl-5,8-dihydro-synthesis, 3, 306... 

Pterin, 6-methyl-5,6,7,8-tetrahydro-configuration, 3, 281 conformation, 3, 281 Pterin, 6-oximinomethyl-8-oxide... 

Pyran, 3-chloro-3,4-dihydro-2,2-dimethoxy-synthesis, 3, 796-797 Pyran, 2-(chloromethyl)tetrahydro-5,10-pentadecadienol synthesis from, 1, 428 Pyran, 2-chlorotetrahydro-conformation, 3, 629 H NMR, 3, 579 Pyran, 4-chlorotetrahydro-synthesis, 3, 777... 

Pyrimidine, 2,2,4,4,6-pentamethyl-2,3,4,5-tetrahydro-conformation, 3, 62 synthesis, 3, 118 Pyrimidine, perhydro-polymers, 1, 313-314 Pyrimidine, phenyl-nitration, 3, 78 Pyrimidine, 4-phenyl-synthesis, 3, 72, 116 Pyrimidine, 5-phenylazo-synthesis, 3, 131 Pyrimidine, 4-phenyI-6-styryl-1-oxide... 

Selenophene, 2-methylmercapto-conformation, 4, 944 Selenophene, 2-nitro-mercuration, 4, 946 Selenophene, 2-phenyl-irradiation, 4, 42, 946 mass spectra, 4, 942 Selenophene, 3-phenyl-mass spectra, 4, 942 Selenophene, tetrachloro-applications, 4, 971 reactions, 4, 955 synthesis, 4, 963 Selenophene, tetrahydro-conformation, 4, 34, 944 IR spectra, 4, 942 mass spectra, 4, 24, 943 molecular structure, 4, 938 NMR, 4, 10, 13 reactions, 4, 88, 958 ring strain, 4, 28 synthesis, 4, 118, 962, 968 Selenophene, tetraphenyl-synthesis, 4, 118, 962, 964 Selenophene, 2-thienyl-... 

Thiazole, 4-methyl-5-(2-hydroxyethyl)-in thiamine biosynthesis, 1, 97 Thiazole, 4-methyl-2-methylami nosynthesis, 6, 300 Thiazole, 4-methyl-2-phenyl-alkylation, 6, 256 mercuration, 6, 256 Thiazole, 2-(methylthio)-methylation, 6, 290 thermodynamic values, 6, 291 Thiazole, 2-methylthio-5-phenyl-synthesis, 5, 153 Thiazole, 4-methyl-5-vinyl-occurrence, 6, 327 Thiazole, 2-phenyl-acetylation, 6, 270-271 Conformation, 6, 237 synthesis, 5, 113, 6, 306 Thiazole, 4-phenyl-conformation, 6, 237 2,5-disubstituted synthesis, 6, 304 Thiazole, 5-phenyl-conformation, 6, 237 Thiazole, 2-phenyl-5-triphenylmethyl-synthesis, 6, 265 Thiazole, 2-(2-pyridyl)-metal complexes, 5, 51 6, 253 Thiazole, 4-(2-pyridyl)-metal complexes, S, 51 6, 253 Thiazole, tetrahydro-ring cleavage, 5, 80 Thiazole, 2,4,5-trimethyl-occurrence, 6, 327... 

The relative stereostructure of 9-acetyl-7-hydroxy-l,2-dimethyl-7-meth-oxycarbonyl-4-phenyl-6-oxo-l, 4,7,8-tetrahydro-6/7-pyrido[l, 2-u]pyri-midine-3-carboxylate 122 was justified by an X-ray diffraction analysis (97JOC3109). The stereochemistry and solid state structure of racemic trans-6,9-//-l, 6-dimethyl-9 z-ethoxy-9-hydroxy-4-oxo-l,6,7,8,9,9 z-hexahydro-4//-pyrido[l,2- z]pyrimidine-3-carboxylate (123), adopting a cw-fused conformation, were determined by X-ray investigations (97H(45)2175). 

In the cyclization of the corresponding cis-epoxides, with the aim of obtaining the corresponding cis-2,3-disubstituted tetrahydropyrans, a similar trend was observed. For these systems, however, the 6-endo pathway was less favored, which was ascribed to difficulties in attaining a TS conformation that would allow for maximum stabilization of the developing p-orbital with the adjacent 7t-system. Alternatively, palladium-catalyzed cyclization of the tetrabutylammonium alkoxide derived from 33b results in the corresponding ris-2,3-disubstituted tetrahydro-pyran in excellent yield and selectivity (90%, dr >99 1), while the ris-epoxide gives stereoisomer 37b (86%, dr 98 2) [112]. 

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