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Showing papers on "Benzopyran published in 1972"


Journal ArticleDOI
TL;DR: In this paper, the reaction of sulfene with 3-dialkylaminomethylene and 4-chromanone gave 1,4-cycloadducts which are derivatives of a new heterocyclic system, i.e., 5H-1,2-oxathiino[5,6-c][1]benzopyran.

30 citations


Journal ArticleDOI
TL;DR: In this paper, a synthesis of psoralene and alkylpsoralenes from 2-bromoresorcinol is described, using 2-methyl-8-oxo-8H-furo[2,3-h][1]- benzopyran rather than the corresponding dihydrofuran.
Abstract: A synthesis of psoralene and alkylpsoralenes from 2-bromoresorcinol is described. Treatment of 2-iodomethyl-8-oxo-2,3-dihydro-8H-furo[2,3.h][l]benzopyran with sodium and ethanol is shown to yield 2-methyl-8-oxo-8H-furo[2,3-h][1]- benzopyran rather than the corresponding dihydrofuran.

12 citations


Patent
C Deboer1
31 Jan 1972
TL;DR: In this paper, the authors discuss the use of VINYL KETONE COMPOUNDS under specific conditions with O-HYDROXYBENZALDEHYDES.
Abstract: NOVEL 2H-3-SUBSTITUTED 5,6-BENZOPYRANS AND PROCESSES FOR THIER PREPARATION ARE DISCLOSED. VINYL KETONE COMPOUNDS ARE RELATED UNDER BASIC CONDITIONS WITH O-HYDROXYBENZALDEHYDES TO FORM THE NOVEL BENZOPYRAN COMPOUNDS. THE COMPOUNDS CAN BE USED TO PREPARE LIGHTSENSITIVE POLYMERS USEFUL IN PHOTOSENSITIVE ELEMENTS AND PROCESSES.

5 citations


Journal ArticleDOI
TL;DR: In subsequent photoreactions, benzobicyclohexenes (7), and cyclopropanes (8) were obtained by photodecarboxylation of the 2-benzopyran-3-one-trimethylmaleimide adducts as discussed by the authors.
Abstract: Photodecarboxylation of the 2-benzopyran-3-one–trimethylmaleimide adducts (6) gives the o-quinodimethanes (1)–(3) which in subsequent photoreactions afford inter alia the benzobicyclohexenes (7), and cyclopropanes (8).

4 citations


Patent
09 May 1972

4 citations


Patent
26 Sep 1972
TL;DR: In this paper, the authors described 4-oxo-4H-1-benzopyran and 4oxo -4H 1-thiabenzopyrans having a group -CONROH in the 2-position, R representing hydrogen, alkyl, phenyl or phenylalkyl, provided that the compounds are not of formula XXXI.
Abstract: There are described 4-oxo-4H-1-benzopyran and 4-oxo-4H-1-thiabenzopyran compounds having a group -CONROH in the 2-position, R representing hydrogen, alkyl, phenyl or phenylalkyl, provided that the compounds are not of formula XXXI, in which Ra is hydrogen or chloride, and pharmaceutically acceptable derivatives thereof. The compounds are indicated for use in the treatment of asthma.

3 citations