Efficient New Protocol to Synthesize Aromatic and Heteroaromatic Dithioesters
作者:Serge Masson、Isabelle Abrunhosa、Mihaela Gulea
DOI:10.1055/s-2004-822311
日期:——
A very efficient, high yielding procedure to synthesize substituted aromatic and heteroaromatic dithioesters is described. It involves the reaction between (phenylsulfonyl)methyl (hetero)aromatic derivatives and elemental sulfur in basic medium, followed by alkylation.
Catalyst development for organocatalytic hydrosilylation of aromatic ketones and ketimines
作者:Andrei V. Malkov、Angus J. P. Stewart-Liddon、Grant D. McGeoch、Pedro Ramírez-López、Pavel Kočovský
DOI:10.1039/c2ob25472g
日期:——
A new family of Lewis basic 2-pyridyl oxazolines have been developed, which can act as efficientorganocatalysts for the enantioselective reduction of prochiral aromatic ketones and ketimines with trichlorosilane, a readilyavailable and inexpensive reagent. 1-Isoquinolyl oxazoline, derived from mandelic acid, was identified as the most efficient catalyst of the series, capable of delivering high
Synthesis of Substituted Benzo[<i>b</i>]thiophenes via Base-Promoted Domino Condensation–Intramolecular C–S Bond Formation
作者:Yogendra Kumar、Hiriyakkanavar Ila
DOI:10.1021/acs.orglett.1c00085
日期:2021.3.5
A novel synthesis of 2,3-substituted benzothiophenes is reported, involving a tandem base-mediated condensation of o-iodoarylacetonitriles/acetates/ketones with (hetero)aryldithioesters and an intramolecular C–S bond formation. The reaction affords diversely substituted benzothiophenes and heterofused thiophenes in excellent yields.
practical approach was developed to insert the thioamide functional group onto the cinchonidine from readily available dithioesters. These organocatalysts were effective in asymmetric decarboxylativeMannich and protonation reactions of alpha-amido-substituted Malonic Acid Half Oxyesters (MAHOs) affording alpha,beta- and alpha-amino acid derivatives in good yields and stereoselectivities respectively.
a better stability to the thiacyclic diene compared to the simple 3,4-dimethylenetetrahydrothiophene. Their reactivity toward several dienophiles has been investigated, and various original thiacycle-fused polycyclic systems have been obtained with high or total diastereoselectivity. Moreover, they are the first exo-bicyclic dienes used in Diels–Alderreactions. The relative configurations of four