Antifungal 3,5-disubstituted furanones: From 5-acyloxymethyl to 5-alkylidene derivatives
作者:Petr Šenel、Lucie Tichotová、Ivan Votruba、Vladimír Buchta、Marcel Špulák、Jiří Kuneš、Milan Nobilis、Ondřej Krenk、Milan Pour
DOI:10.1016/j.bmc.2010.01.030
日期:2010.3
parent furanone structure were therefore prepared and evaluated. In line with the ease of elimination of the substituent from C5, low activities of the 5-alkoxy compounds were observed. On the other hand, their 5-aryloxymethyl congeners were found to be capable of liberating the antifungally active 5-methylene furanone into the testing medium. The antifungal effect of the 5-alkylidene derivatives was
Two-Step Synthesis of (Z)-3-Aryl-5-(arylmethylidene)butenolides by an Ivanov Reaction/Silver(I)-Catalyzed Lactonization/In Situ Dehydration Sequence
作者:Reinhard Brückner、David Hermann、Deniz Arican
DOI:10.1055/s-0036-1588338
日期:——
Dedicated to Professor Dieter Enders (RWTH Aachen) on the occasion of his 70th birthday Abstract A stereoselective synthesis of the title compounds was developed. Hexane- and amine-free THF solutions of α-lithiated lithium arylacetates (‘arylacetic acid dianions’) were aldol-added to 3-arylpropynals. This gave 2,5-diaryl-3-hydroxypent-4-ynoic acids with up to a 72:28 preference for the anti-diastereomer