Showing papers on "Benzopyrans published in 1970"

Metabolites of Helminthosporium monoceras: structures of monocerin and related benzopyrans

Abstract: Monocerin, an antifungal metabolite of Helminthosporium monoceras, is shown to be 2,3,3a,9b-tetrahydro-6-hydroxy-7,8-dimethoxy-2-n-propyl-5H-furo[3,2-c][2]benzopyran-5-one (Ia). Structures are also assigned to three related metabolites—hydroxymonocerin (Id), monocerone (Ie), and monocerolide (V).

Über die Reaktion von Diphenylketen mit 4-Pyronen 24. Mitt. über Untersuchungen an 4-Pyronen

Abstract: Pyrone-(4),-1-Thiopyrone-(4),4-Thiopyrone sowie Benzopyrone-(4) reagieren mit Diphenylketen zu Diphenylmethylen-4H-pyranen bzw.-benzopyranen, die in saurer Losung Pyryliumsalze bilden, wie mit UV- und NMR-Spektren nachgewiesen werden kann. The Reaction of Diphenylketene with 4-Pyrones Various pyrones-(4), 1-thiopyrones-(4), 4-thiopyrones and benzopyrones-(4) react with diphenylketene yielding diphenylmethylene-4H-pyrans and -benzopyrans respectively, which form in acidic solution pyrylium salts identified. There were by UV- and NMR-spectra.

4-oxo-9-hydroxy-7-(3-methyl-2-octyl)-1 2 3 4-tetrahydrocyclopenta(c)(1)benzopyran

Abstract: 4-OXO-9-HYDROXY-7-(3-METHYL - 2 - OCTYL)-1,2,3,4-TETRAHYDROCYCLOPENTA(C)(1)BENZOPYRAN, USED AS AN INTERMEDIATE IN THE PREPARATION OF 1,2,3,4-TETRAHYDROCYCLOPENTA(C)(1)BENZOPYRANS AND 1,2,3,4,12,13-HEXAHYDROCYCLOPENTA(C)(1)BENZOPYRANS WHICH HAVE C.N.S. ACTIVITY.

3-substituted 6alpha,beta-alkyl-cyclopenta(f)(1)benzopyrans and-naphto(2,1-b)pyrans

Abstract: STEREO-SPECIFIC TOTAL SYNTHESIS OF STEROIDAL MATERIALS. 7-SUBSTITUTED 3-OXO-1-HEPTENES OR VARIANTS THEREOF ARE REACTED WITH 2-ALKYLCYCLOALKANE 1,3-DIONES YIELDING 3-SUBSTITUTED 6AB-ALKYL-CYCLOPENTA(F)(1)BENZOPYRANS OR NAPHTHO(2,1-B)PYRANS. THESE AE THEN SUBJECTED TO A SELECTIVE CATALYTIC HYDROGENATION FOLLOWED BY AN INTRODUCTION OF A HYDROXY, ALKOXY OR ACYLOXY GROUP AT THE 4A-POSITION TO PRODUCED A 3-SUBSTITUTED 6AB,4A-HYDROXY, ALKOXY OR ACYLOXY PERHYDROCYCLOPENTA(F)(1)BENZOYPRAN OR PERHYDRO NAPHTHO(2,1-B)PYRAN. THESE LATTER COMPOUNDS ARE THEN CONVERTED INTO 4- OR 5-(3-OXOALKYL)PERHYDROINDENE-5ONES OR PERHYDRONAPHTHALENE-6-ONES WHICH IN TURN CAN BE CONVERTED TO KNOWN STEROIDAL MATERIALS BY KNOWN METHODS.