Ali D, Hunter R, Kaschula CH, De Doncker S, Rees-Jones SCM. Unsymmetrical Organotrisulfide Formation via Low-Temperature Disulfanyl Anion Transfer to an Organothiosulfonate.
J Org Chem 2019;
84:2862-2869. [PMID:
30712350 DOI:
10.1021/acs.joc.8b03262]
[Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
New methodology is presented for the formation of unsymmetrical organotrisulfides in a high yield and purity, relatively free of polysulfide byproducts. The highlight of the method is the low-temperature (-78 °C) deprotection of a disulfanyl acetate with sodium methoxide in THF to form a disulfanyl anion, which reacts rapidly in situ with an organothiosulfonate ( S-aryl or S-alkyl) within 30 seconds followed by quenching. The discovery of these new reaction conditions together with the relative greenness of the chemistry overall makes for an efficient protocol, from which a range of organotrisulfides covering aliphatic, aromatic, as well as cysteine and sugar groups can be accessed in a high yield and purity.
Collapse