Chemo- and Diastereoselectivity in the Dimethyldioxirane Oxidation of 2,3-Dihydro-4<i>H</i>-1-benzothiopyran-4-ones and 4<i>H</i>-1-Benzothiopyran-4-ones. Unusual Reactivity of 4<i>H</i>-1-Benzothiopyran-4-one 1-Oxides<sup>1</sup>
the corresponding sulfides. The observed anomaly may be explained in terms of transannular stabilization of the transition structure (TS) for the sulfone formation, promoted through favorable conformational effects in the sulfoxide. Higher sulfoxide/sulfone ratios were found in solvents of greater hydrogen bond donor capacity, which is in accordance with the postulated stabilizing effect.
Synthesis and antitumor activity of a series of sulfone analogs of 1,4-naphthoquinone
作者:Mark H. Holshouser、Larry J. Loeffler、Iris H. Hall
DOI:10.1021/jm00139a017
日期:1981.7
A series of novel substituted thiochromones and thiochroman-4-ones was synthesized. Compounds were designed as analogues of naphthoquinone and as potential "bioreductivealkylatingagents" and were tested for antitumor activity. The lead compound, 3-(chloromethyl)thiochromone 1,1-dioxide (4), inhibited Ehrlich ascites tumor growth by 100% in CF1 male mice at 10 (mg/kg)/day ip. Similarly, 18 of the
Antimicrobial activity of 3-(substituted methyl)-2-phenyl-4<i>H</i>-l-benzothiopyran-4-ones
作者:Hiroyuki Nakazumi、Tamio Ueyama、Teijiro Kitao
DOI:10.1002/jhet.5570220625
日期:1985.11
A series of 3-(substitutedMethyl)-2-phenyl-4H-l-benzothiopyran-4-ones (thioflavones) and thioflavone 1,1-dioxides was prepared to test for antimicrobialactivity and for antitumor activity. It was shown that an introduction of a substitutedmethyl group in the 3-position of thioflavone resulted in significant antimicrobialactivity against Trichophytons. 3-(Acetoxymethyl)thioflavone shows the most
Synthesis and reactivity of spiro[1,3,4-thiadiazoline-2,4′-thioflavans] and analogues
作者:László Somogyi
DOI:10.1002/jhet.25
日期:2009.5
3-acetylspiro[1,3,4-oxa(thia)-diazoline-2,4′-thioflavans] with trans O(1) or S(1) and Ph(2′eq) under acetylating conditions. Conjugation between the ethylenic bond and sp2 C(4) in thioflavones encumber both the formation of (thio)acylhydrazones and their subsequent spirocyclization. On the other hand, subsequent dehydrogenation of the thiopyran moiety of spiro compounds results in formation of sp2 C(4)
Copper-Catalyzed One-Pot Synthesis of 2-Arylthiochromenones: An in Situ Recycle of Waste Byproduct as Useful Reagent
作者:Subramani Sangeetha、Govindasamy Sekar
DOI:10.1021/acs.orglett.8b03508
日期:2019.1.4
Copper-catalyzed one-pot synthesis of various 2-arylthiochromenones is developed using xanthate as an odorless sulfur source from easily acquirable 2′-halochalcones. This methodology demonstrates that the cross-coupled product thiochromanone synthesized from 2′-halochalcones (upstream reaction) is oxidized to thiochromenone (downstream reaction) in the same pot using waste byproduct (KI) of the first