Pyran synthesis

H-pyran synthesis from, 3, 759 bis(trimethylsiloxy) in pyrrole synthesis, 4, 333 chromene synthesis from, 3, 750 cycloaddition reactions with isocyanates, azetidin-2-ones from, 7, 261 dihydropyran synthesis from, 3, 771 fuiyl... 

H-pyran synthesis from, 3, 762 Methylene, 2-pyridyl-ESR, 2, 144 Methylene, 3-pyridyl-ESR, 2, 144 Methylene, 4-pyridyl-ESR, 2, 144 Methyl eneimine... 

H-Naphtho[2,3-h]pyran, 5,10-diacetoxy-2-methyl-oxidation, 3, 670 Naphtho[2,3-c]pyran synthesis, 3, 770... 

Penicillin V—see Penicillin, phenoxymethyl-, 7, 300 Penicilloate, benzyl-, 7, 303 Penicilloate, D-a-benzyl-a-methyl ester, 7, 303 Penillamine, benzyl-, 7, 303 Penillic acid, benzyl-, 7, 303 Penilloaldehyde, benzyl-, 7, 303 Penilloic acid, benzyl-, 7, 303 Penillonic acid, benzyl-methyl ester, 7, 303 1,2,3,4,6-Pentaazaindene nomenclature, 1, 18 Pentadeca-5,10-dienols synthesis, 1, 428 Pentadienol, tetrachloro-2H-pyran synthesis from, 3, 740 Pentadienonitrile, 5-(l,2-benzoselenazol-3-yl)-X-ray diffraction, 6, 334 Penta-2,4-dienonitrile, 5-(dimethylamino)-2-(2-thienyl)-... 

H-pyran synthesis from, 3, 757 tetrahydropyranone synthesis from, 3, 845 Pentane-1,5-diol, 1,5-diphenylring closure, 3, 774 Pentane-1,5-diols... 

UV spectra, S, 844 Pent-2-ene, perfluoro-2-methyl-2H-pyran synthesis from, 3, 740 Pent-2-enedioic acid, 2,4-diacetyl-esters... 

H-pyran synthesis from, 3, 759 Propyne, 3-(2-amino-1 -benzimidazolyl)-isomerization, 5, 450 Propynoic acid, phenyl-ethyl ester... 

K-pyran synthesis from, 3, 761-762 pyridazine synthesis from, 3, 54 pyrylium salt synthesis from, 3, 872 reduced, 2, 45... 

An example illustrating the synthesis of condensed oxepins by the cobalt-catalyzed reaction of bistrimethylsilylacetylene with a hexa-l,5-diyne derivative is shown in Scheme 175.234 This type of process has been discussed earlier in the context of pyran synthesis (see Scheme 158 in Section V,B,2). 

Figure 1 General methods of 2-amino-4H-pyran synthesis.

There are some examples of pyran synthesis by Method 2, which involves the reactions of unsaturated ketones with methylene-active nitriles. In a typical case of Method 2, the Michael reaction of a,j5-unsaturated carbonyl compounds 26 (77TL1835, 78JHC57,... 

Aminopyrans 244, spiro-conjugated with an polycyclic N,0,S-system, have been synthesized using N,S-acetal derivatives of actylacetone and acetoacetic ester 245 (00PS(160)105). Diacetyl derivative 245 (Z = COMe) undergoes deacetylation in the course of pyran synthesis (Scheme 93). 

The second three-component pyran synthesis may involve the following combinations of precursors three identical molecules, two identical and one different molecule, and three different molecules. Only the first two combinations have been described as yet. 

H-pyran synthesis from, 3, 739 tautomerism, 3, 644 UV spectra, 3, 598 Ionophore A23187 as antibiotic, 4, 374 Ionophore X14547A as antibiotic, 4, 374 Ionophores, 7, 732, 755 anticoccidial activity veterinary use, 1, 213... 

Isoxazolin-5-one, 2,3-dimethyl-4-substituted photolysis, 6, 14 Isoxazolinones synthesis, 5, 132 Isoxazolin-3-ones alkylation, 6, 43 synthesis, 6, 106, 129 Isoxazolin-4-ones synthesis, 6, 106-107 Isoxazolin-5-ones alkylation, 6, 39 4,4-dialkyl substituted reaction with Grignard reagents, 6, 40 reactions with bases, 6, 41 synthesis, 6, 103-105 Isoxazolium bisulphate, 2,3,5-trimethyl-hydrogen exchange, 6, 21 Isoxazolium salts deprotonation, 5, 71 as hardeners for gelatin, 1, 363 nucleophilic cleavage, 6, 31 nucleophilic reactions, 6, 28-29 4/f-pyran synthesis from, 3, 761 reactions... 

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