Controlling Stereoselectivity in Tribromide Mediated Oxidative Dearomatisations - Synthesis of Selective Spirofurano-naphthalones
作者:Debayan Sarkar、Puspendu Kuila、Devashish Sood
DOI:10.1002/ejoc.201900974
日期:2019.9.15
A mild and highly stereocontrolled tribromide mediatedsynthesis of spiro‐furano naphthalones via a oxidative dearomatisation process is reported.
据报道,通过氧化脱芳香化过程,温和且高度立体控制的三溴化物介导的螺-呋喃酮萘的合成。
Phenyl trimethyl ammonium tribromide mediated robust one-pot synthesis of spiro-oxacycles – an economic route – stereoselective synthesis of oxaspirohexacyclodieneones
作者:Debayan Sarkar、Manoj Kumar Ghosh、Nilendri Rout
DOI:10.1039/c6ob01116k
日期:——
This paper entails the first recognition of PhenylTrimethylAmmonium Tribromide (PTAB) as an effective reagent for spiro-cyclizations proceeding via oxidative dearomatization. The experiment exhibits economical, metal and ligand free one-pot accomplishment of these significant transformations. The described protocol presents the first generalised methodology of spiro-oxacycle synthesis which can be
Ruthenium(VIII)-Catalyzed <i>ipso</i>-Dearomative Spiro-Etherification and Spiro-Amidation of Phenols
作者:Debayan Sarkar、Nilendri Rout
DOI:10.1021/acs.orglett.9b01322
日期:2019.6.7
An open air ruthenium(VIII)-catalyzed oxidative spiro-etherification as well as spiro-amidation of phenols has been performed. The transformation works satisfactorily with both phenols and naphthols and thus exhibits a wide range of flexibility. The catalysis is performed in open air at room temperature with a yield of ≤95%.
105. Experiments on the synthesis of substances related to the sterols. Part XXXIX. (A) Some derivatives of hydrindene. (B) Reduction of 1-γ-ketobutyl-2-naphthol
作者:F. J. McQuillin、Robert Robinson
DOI:10.1039/jr9410000586
日期:——
Chemoselective Oxidative Spiroetherification and Spiroamination of Arenols Using I<sup>+</sup>/Oxone Catalysis
We developed a chemoselective oxidative dearomative spiroetherification and spiroamination of arenols using I+/oxone catalysis. The intramolecular dearomative C-O and C-N couplings proceeded much more efficiently under slightly acidic conditions to give the corresponding spiro adducts in higher yields compared with previous methods using transition metal or hypervalent iodine catalysts. Control experiments