Riboflavin as Photoredox Catalyst in the Cyclization of Thiobenzanilides: Synthesis of 2-Substituted Benzothiazoles
作者:Lydia M. Bouchet、Adrián A. Heredia、Juan E. Argüello、Luciana C. Schmidt
DOI:10.1021/acs.orglett.9b04384
日期:2020.1.17
Benzothiazoles are synthesized from thiobenzanilides using riboflavin as a photosensitizer and potassium peroxydisulfate as a sacrificial oxidizing agent under visible light irradiation. The methodology accepts a broad range of functional groups and affords the 2-substitutedbenzothiazoles by transition-metal-free organic photoredoxcatalysis under very mild conditions.
Reactivity and diastereoselectivity of Michael additions of amines to achiral α,β-unsaturated thioamides
作者:Jacek G Sośnicki、Tadeusz S Jagodziński、Poul Erik Hansen
DOI:10.1016/s0040-4020(01)00849-3
日期:2001.10
aliphatic amines add to acyclic and cyclic α,β-unsaturated thioamides yielding β-amino-functionalized derivatives. In the case of cyclic acceptors, the formation of both kinetic and thermodynamically controlled products is observed. Tailoring of cis or trans products is thus possible. A mechanism for the addition to cyclic acceptors is proposed and evidence presented to support it. Ease of addition is studied
Sulfur-containing heterocycles derived by the reaction of hydroxy-amides and Lawesson's reagent
作者:Takehiko Nishio
DOI:10.1016/0040-4039(95)01232-7
日期:1995.8
A simple one-pot reaction between hydroxy-amides (1) located, 1,3- or 1,4- to each other, and Lawesson's reagent (LR) gives sulfur-containg heterocycles such as tetrahydrothiophene-2-imines (4), tetrahydrothiophene-2-thione (5) and tetrahydrothiopyrandash2-thione (6). Similar reaction of 3-N-acylamino-alcohols (7) affords thiazoline derivatives (9).
Temperature coefficient of NH chemical shifts of thioamides and amides in relation to structure
作者:Jacek G Sośnicki、Poul Erik Hansen
DOI:10.1016/j.molstruc.2004.01.006
日期:2004.8
measured in a large series of N-substituted-3-piperidinethiopropionamides in which the N⋯N distances are short but of varied length, as well as in a couple of the corresponding amides and in some simpler amides and thioamides. Geometries are calculated by means of ab initio DFT methods. The N-substituted-3-piperidinethiopropionamides show in most cases strong intramolecular N–H⋯N hydrogen bonds according
Metal- and base-free, aerobic photoredox catalysis with riboflavin to synthesize 2-substituted benzothiazoles
作者:Adrián A. Heredia、Juan E. Argüello、Luciana C. Schmidt
DOI:10.1039/d3ob01851b
日期:——
Sustainable approaches for the synthesis of 2-substitutedbenzothiazoles are sought after for their use in organic chemistry, bioorganic chemistry, and industrial applications. Here, we described a visiblelight-drivenphotoredox catalytic cyclization of thioanilides to afford 2-substitutedbenzothiazoles using riboflavin as a photocatalyst, where oxygen is used as a clean oxidant and ethanol as a