Regioselective radical cyclization initiated by the reaction of allylic hydroperoxides with iron(II) sulfate

A Domino Radical Amidation/Semipinacol Approach to All-Carbon Quaternary Centers Bearing an Aminomethyl Group

A photoredox-mediated radical amidation ring-expansion sequence that enables the generation of all-carbon quaternary centers bearing a protected aminomethyl substituent is described. The methodology can be applied to both styrene and unactivated alkene substrates generating structurally diverse sp3 -rich amine derivatives in a concise manner.

Scalable procedure for the fragmentation of hydroperoxides mediated by copper and iron tetrafluoroborate salts

An improved protocol for the formal elimination of propene from organic substrates is reported. This process entails the ozonolytic conversion of an alkene to a methoxy hydroperoxide which undergoes fragmentation mediated by copper and iron. The use of soluble Cu(BF4)2 and Fe(BF4)2 results in reproducible results up to a 100 gram scale.

Sesquiterpenoids and artificial 19-oxygenated steroids from the formosan soft coral Nephthea erecta

Chemical investigations on the acetone and MeOH solubles of the soft coral Nephthea erecta have afforded five new sesquiterpenoids (1-5), one known sesquiterpene, kelsoene (6), and two known 19-oxygenated steroids (10 and 11). In addition, three unexpected artificial 19-oxygenated steroids (7-9) were obtained by letting 10 and 11 stand in CDCl(3) for prolonged periods of time. The structures of 1-9 were elucidated by extensive spectroscopic analyses, and their cytotoxicity against selected cancer cells was measured in vitro.

New protocol for oxidation in water: micellar oxidation systems composed of novel amphiphilic hydroperoxides

A series of novel amphiphilic hydroperoxides, alpha-alkoxyalkyl hydroperoxides (alpha-AHPs) and their related hydroperoxides, were designed and prepared with the intention of developing new oxidizing agents bearing a micelle-forming character in water. After their fundamental physical and interfacial properties were elucidated, both oxidation of benzyl sulfide and epoxidation of geraniol promoted by these hydroperoxides were investigated in detail under various conditions. Effective oxidation ofbenzyl sulfide to the corresponding sulfoxide was achieved in aqueous micellar systems composed of alpha-AHPs la-d and a catalytic amount of MoO2(acac)2 at 30 degrees C. Up to 100% conversion was observed under the optimum conditions. In the case of epoxidation of geraniol in water, the corresponding 2,3-epoxide was selectively formed in good yields. Because the conversion of each substrate in the micellar systems was higher than that in nonmicellar media, the solubilization of substrates into micelles was certainly effective in promoting oxidations of insoluble substrates in aqueous media. Micellar oxidation systems composed of novel amphiphilic hydroperoxides afford a new protocol in order to derive safer conditions under which these reactions may be carried out.