Organic sulfur chemistry. 42. Sulfur-sulfur bond cleavage processes. Selective desulfurization of trisulfides
作者:David N. Harpp、Roger A. Smith
DOI:10.1021/ja00386a034
日期:1982.11
these transition states to alter the kinetically important step. For desulfurization without inversion at an ..cap alpha..-carbon, triphenylphosphine is quite effective as it removes almost exclusively the central sulfur atom. However, for less reactive trisulfides, a tris(dialkylamino)phosphine would be required for a rapid desulfurization. In this case, desulfurization in benzene or ether provides
NFSI-catalyzed S S bond exchange reaction for the synthesis of unsymmetrical disulfides
作者:Mengjie Song、Qingyue Hu、Zheng-Yi Li、Xiaoqiang Sun、Ke Yang
DOI:10.1016/j.cclet.2021.12.073
日期:2022.9
The metal-free SS bond exchangereaction of symmetrical disulfides catalyzed by NFSI is described. This novel protocol provides a facile and efficient approach to accessing important unsymmetrical disulfides. Furthermore, this strategy could also be utilized in the late-stage functionalization of amino acids, drugs, and natural products. The broad substrate scope, good functional group tolerance and
Microwave-assisted synthesis of asymmetric disulfides
作者:Xiaogang Lu、Hongmei Wang、Runli Gao、Daoming Sun、Xiaojing Bi
DOI:10.1039/c4ra03592e
日期:——
Thiourea is very useful in the synthesis of asymmetric and symmetric disulfides. In this paper, we report an efficient, odorless, and one-pot procedure for the synthesis of benzyl alkyl disulfides by using the mixtures of thiourea, alkyl halides, and benzyl thiocyanates. The reaction was carried out in water with the assistance of microwaves, enabling a time-saving process. Optimal conditions were
硫脲在不对称和对称二硫化物的合成中非常有用。在本文中,我们报告了一种高效,无味,一锅法的合成方法,方法是使用硫脲,烷基卤化物和硫氰酸苄酯的混合物。该反应是在水中借助微波进行的,从而节省了时间。最佳条件如下:硫氰酸苄酯(1.0当量),硫脲(2.0当量)和卤代烷(1.2当量)在微波辐射下使用K 3 PO 4进行反应。在90°C的水中浸泡15分钟。在大多数情况下,产率高于80%。在该方案中,底物易于获得,并且其合成比相应的硫醇容易得多。而且,它在环境和经济上都是友好的。
Sirakawa,K. et al., Chemical and pharmaceutical bulletin, 1970, vol. 18, # 2, p. 235 - 242