Indexed keywords
2-OXAZINES, REDUCTION;
5,6-DIHYDRO-4H-1;
DIASTEREOSELECTIVE SYNTHESIS;
MALONATES;
OXYIMINIUM CATIONS;
SODIUM CYANOBOROHYDRIDE;
STEREO-SELECTIVE;
TWO-STEP REDUCTIONS;
AMINATION;
AMINES;
AMINO ACIDS;
POSITIVE IONS;
STEREOCHEMISTRY;
ORGANIC ACIDS;
5,6 DIHYDRO 4H 1,2 OXAZINE DERIVATIVE;
AMINO ACID DERIVATIVE;
DIMETHYL 2 [[1 (TERT BUTOXYCARBONYL) 3 (4 METHOXYPHENYL) 5 METHYLPYRROLIDIN 2 YL]METHYL]MALONATE;
DIMETHYL 2 [[2 BENZOYL 4 (4 METHOXYPHENYL) 6 PHENYLTETRAHYDRO 2H 1,2 OXAZIN 3 YL]METHYL]MALONATE;
DIMETHYL REL 2 [ 2 (BENZOYLAMINO) 5 HYDROXY 3,5 DIMETHYLHEXYL]MALONATE;
DIMETHYL REL 2 [ 2 (BENZOYLAMINO) 5 HYDROXY 5 METHYL 3 PHENYLHEXYL]MALONATE;
DIMETHYL REL 2 [2 (BENZOYLAMINO) 3 (4 METHOXYPHENYL) 5 PHENYLPENTYL]MALONATE;
DIMETHYL REL 2 [2 (BENZOYLAMINO) 5 HYDROXY 3 (4 METHOXYPHENYL) 5 METHYLHEXYL]MALONATE;
DIMETHYL REL 2 [[1 (TERT BUTOXYCARBONYL) 3 (4 METHOXYPHENYL)PYRROLIDIN 2 YL]METHYL]MALONATE;
DIMETHYL REL 2 [[2 (BENZOYLAMINO) 3 [2 HYDROXYCYCLOHEXYL] 3 (4 METHOXYPHENYL]PROPYL]MALONATE;
DIMETHYL REL 2 [[2 BENZOYL 4 (4 CHLOROPHENYL) 6,6 DIMETHYLTETRAHYDRO 2H 1,2 OXAZIN 3 YL]METHYL]MALONATE;
DIMETHYL REL 2 [[2 BENZOYL 4 (4 METHOXYPHENYL) 6 PHENYLTETRAHYDRO 2H 1,2 OXAZIN 3 YL]METHYL]MALONATE;
DIMETHYL REL 2 [[2 BENZOYL 4 (4 METHOXYPHENYL) 6,6 DIMETHYLTETRAHYDRO 2H 1,2 OXAZIN 3 YL]METHYL]MALONATE;
DIMETHYL REL 2 [[2 BENZOYL 4 (4 METHOXYPHENYL)OCTAHYDRO 2H 1,2 BENZOXAZIN 3 YL]METHYL]MALONATE;
DIMETHYL REL 2 [[2 BENZOYL 4,6,6 TRIMETHYLTETRAHYDRO 2H 1,2 OXAZIN 3 YL]METHYL]MALONATE;
DIMETHYL REL 2 [[2 BENZOYL 6,6 DIMETHYL 1,4 PHENYLTETRAHYDRO 2H 1,2 OXAZIN 3 YL]METHYL]MALONATE;
DIMETHYL REL 2 [[4 (4 METHOXYPHENYL) 6 PHENYL 5,6 DIHYDRO 4H 1,2 OXAZIN 3 YL]METHYL]MALONATE;
DIMETHYL REL 2 [[4 (4 METHOXYPHENYL) 6,6 DIMETHYL TETRAHYDRO 2H 1,2 OXAZIN 3 YL]METHYL]MALONATE;
DIMETHYL REL 2 [[6 ETHOXY 4 (4 METHOXYPHENYL)TETRAHYDRO 2H 1,2 OXAZIN 3 YL]METHYL]MALONATE;
DIMETHYL REL 2 [[6 METHOXY 4 (4 METHOXYPHENYL) 6 METHYLTETRAHYDRO 2H 1,2 OXAZIN 3 YL]METHYL]MALONATE;
GAMMA AMINO ACID;
METHYL 2 ETHOXY 4 (4 METHOXYPHENYL) 7 OXOHEXAHYDRO 2H PYRROLO[1,2 B][1,2]OXAZINE 6 CARBOXYLATE;
METHYL 2,2 DIMETHYL 7 OXO 4 PHENYLHEXAHYDRO 2H PYRROLO[1,2 B][1,2]OXAZINE 6 CARBOXYLATE;
METHYL 2,2,4 TRIMETHYL 7 OXOHEXAHYDRO 2H PYRROLO[1,2 B][1,2]OXAZINE 6 CARBOXYLATE;
METHYL 4 (4 CHLOROPHENYL) 2,2 DIMETHYL 7 OXOHEXAHYDRO 2H PYRROLO[1,2 B][1,2]OXAZINE 6 CARBOXYLATE;
METHYL 4 (4 METHOXYPHENYL) 2,2 DIMETHYL 7 OXOHEXAHYDRO 2H PYRROLO[1,2 B][1,2]OXAZINE 6 CARBOXYLATE;
OXAZINE DERIVATIVE;
REL 3[3 (4 METHOXYPHENYL) 5 METHYLPYRROLIDIN 2 YL]PROPANOIC ACID;
SODIUM BOROHYDRIDE;
UNCLASSIFIED DRUG;
UNINDEXED DRUG;
ARTICLE;
CHEMICAL BOND;
REDUCTION;
STEREOCHEMISTRY;
3
36749088346
Angermann, J.; Homann, K.; Reissig, H.-U.; Zimmer, R. Synlett 1995, 1014.
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34047190944
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12
53849133470
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Borissova, A.O.6
14
10044231702
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Argyropoulos, N.G.7
17
33947523646
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18
2942744916
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19
33748687578
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20
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21
36749082897
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22
63449121282
Our attempts to reduce the N-O bond [H2 (75 bar, Raney nickel, 100 °C; H2 (60 bar, 5% Pd/C, 100 °C; SmI2 THF; COCl2, NaBH4, MeOH] in products 10 failed, therefore they could not be used in route c Scheme 3
4, MeOH] in products 10 failed, therefore they could not be used in route c (Scheme 3).
23
63449109011
2O nor with CbzCl.
2O nor with CbzCl.
24
63449121883
3CN, AcOH, Scheme 9).
3CN, AcOH, Scheme 9).
25
63449139215
Successful transformation 6h to 10h can be realized only by heating 6h in AcOH (see experimental part).
Successful transformation 6h to 10h can be realized only by heating 6h in AcOH (see experimental part).
26
63449137956
For similar processes in the hydrogenation of other 6- phenyl-substituted 5,6-dihydro-4H-1,2-oxazines see ref. 3.
For similar processes in the hydrogenation of other 6- phenyl-substituted 5,6-dihydro-4H-1,2-oxazines see ref. 3.
27
0002457459
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32
63449083687
Reduction of iminium salt 15c to tetrahydrooxazine 6c is accompanied by the partial formation of oxime ether 4c yield: 25
Reduction of iminium salt 15c to tetrahydrooxazine 6c is accompanied by the partial formation of oxime ether 4c (yield: 25%).
35
63449120744
Lambert, J. B.; Takeuchi, Y. Cyclic Organonitrogen Stereodynamics; VCH: New York, 1992, Chap 7.1.1 and 7.2.1, and references cited therein.
Lambert, J. B.; Takeuchi, Y. Cyclic Organonitrogen Stereodynamics; VCH: New York, 1992, Chap 7.1.1 and 7.2.1, and references cited therein.
36
27944481656
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37
9344263481
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36649038327
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39
63449134224
It is noteworthy, that according to NMR cation 15c and its precursor, dihydrooxazine 4c, have the same dominant conformation.
It is noteworthy, that according to NMR cation 15c and its precursor, dihydrooxazine 4c, have the same dominant conformation.
40
63449102154
In the studies23 the stereochemistry of C-C coupling with six-membered cyclic nitronates possessing substitution at C5 was not examined. The stereochemical course the reduction of some 5-substituted dihydrooxazines with NaBH3CN10 can be also rationalized in terms of proximal approach of the reducing agent to the cation intermediate
10 can be also rationalized in terms of proximal approach of the reducing agent to the cation intermediate.
41
63449127242
An example of such a process is discussed in ref. 23a
An example of such a process is discussed in ref. 23a.
43
33745751373
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