Samarium(II) iodide mediated intramolecular reductivecoupling of carbonyl groups and alkynes in the presence of HMPA and t-BuOH was successfully performed to provide cyclized products. Some cyclic compounds containing a heteroatom such as oxygen or nitrogen were also efficiently prepared by this coupling reaction.
Solvent‐Free Synthesis of Quaternary Oxazolidine‐2‐thione β
<sup>3</sup>
‐Amino Ester Analogs
作者:Francesco Soddu、Federico Devoto、Valentina Marras、Pierluigi Caboni、Francesco Secci、David J. Aitken、Angelo Frongia
DOI:10.1002/ejoc.202201115
日期:2022.12.12
organocatalyzed intermolecular cyclization reaction starting from β-substituted γ-hydroxy-α,β-unsaturated esters and aryl isothiocyanates proceeds via an aza-Michael addition to provide previously unknown quaternary oxazolidine-2-thione β 3 ‑aminoesters. A panel of diversely-substituted esters was investigated, including β,γ-disubstituted examples which provided the target molecules with very high