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Your search keyword '"Veiga, Luiz Alte da"' showing total 6 results
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6 results on '"Veiga, Luiz Alte da"'

1. Synthesis of chiral pyrrolo[1,2-c]thiazoles via intramolecular dipolar cycloaddition of munchnones: an interesting rearrangement to pyrrolo[1,2-c]thiazines

Author

Melo, Teresa M. V. D. Pinho e, Soares, Maria I. L., Gonsalves, Antonio M. d'A. Rocha, Paixao, Jose A., Beja, Ana M., Silva, Manuela Ramos, Veiga, Luiz Alte da, and Pessoa, Joao Costa

Subjects
Chemistry, Organic -- Research, Chirality -- Physiological aspects, Ring formation (Chemistry) -- Physiological aspects, Carboxylic acids -- Physiological aspects, Biological sciences, Chemistry
Abstract

Research has been conducted on the bicyclic munchnones. The results of the intramolecular cycloaddition of these munchnones derived from 2-substituted-N-acylthiazolidine-4-carboxylic acids' cyclodehydration are presented.

Published
2002

2. Reactions with nucleophiles

Author

Melo, Teresa M. V. D. Pinho e, Lopes, Claudia S. J., Gonsalves, Antonio M. d'A. Rocha, Beja, Ana M., Paixao, Jose A., Silva, Manuela R., and Veiga, Luiz Alte da

Subjects
Chemistry, Organic -- Research, Nitrogen -- Physiological aspects, Aniline -- Physiological aspects, Potassium -- Physiological aspects, Biological sciences, Chemistry
Abstract

Research has been conducted on the nucleophilic substitution reactions of 2-halo-2H-azirines with potassium phthalimide and aniline. Results indicate that these reactions have produced substituted 2H-azirines.

Published
2002

3. A new route to cross-conjugated Bis(enamines) and an unusual reaction with DDQ

Author

Pinho e Melo, Teresa M.V.D., Cabral, Ana M.R.D.P.V., Rocha Gonsalves, Antonio M. d'A., Beja, Ana M., Paixao, Jose A., Silva, Manuela R., Veiga, Luiz Alte da, and Bilchrist, Thomas L.

Subjects
Organic compounds -- Synthesis, Diels-Alder reaction -- Usage, Biological sciences, Chemistry
Abstract

A novel route to cross-conjugated bis(enamines) is discussed as is an unusual reaction with DDQ. The procedure is that used previously for thiazolidines from cysteine methyl ester to react with aldehyes with silver carbonate and DBU. The reactions gave transient 1-substituted methyl 2-azadiene-3-carboxylates that act as Diels-Alder dienes. When it is applied to other thiazolidines, products are isolable cross-conjugated bis(enamines).

Published
1999

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