Tandem Amination/Cycloisomerization of Aryl Propargylic Alcohols with 2-Aminopyridines as an Expedient Route to Imidazo[1,2-a]pyridines
作者:Ping Liu、Chun-Lin Deng、Xinsheng Lei、Guo-qiang Lin
DOI:10.1002/ejoc.201101053
日期:2011.12
A new tandemroute leading to imidazo[1,2-a]pyridines has been explored through the direct amination of arylpropargylicalcohols with 2-aminopyridines and their subsequent intramolecular cycloisomerization. A ZnCl2/CuCl system has been developed to promote this transformation, which resulted in various imidazo[1,2-a]pyridines in moderate to good yields.
The enantioselectiveenzymaticdesymmetrization of several highly substituted meso-tetrahydropyranyl diols is described. This transformation leads to valuable building blocks containing up to five stereogenic centers, which are revealed in a single step with both high yields and excellent enantiomeric excesses. Moreover, it was shown that this kind of building blocks could provide an easy access to
Synthesis of 1,2-Oxazinanes via Hydrogen Bond Mediated [3 + 3] Cycloaddition Reactions of Oxyallyl Cations with Nitrones
作者:Lingbowei Hu、Michael Rombola、Viresh H. Rawal
DOI:10.1021/acs.orglett.8b02301
日期:2018.9.7
the development of [3 + 3] cycloadditionreactions between oxyallyl cations and nitrones to yield 1,2-oxazinane heterocycles. Oxyallyl cation intermediates, generated in situ from α-tosyloxy ketones in the presence of hexafluoro-2-propanol (HFIP), a cosolvent, and a base, are found to react with a range of nitrones to afford 1,2-oxazinanes in good to high yields. The reactions are catalyzed by hydrogen-bond
This disclosure describes certain novel 3-(.alpha.-substituted-benzyl)-2,3-dihydrothiazolo[3,2-a][1,3]diazacyclan- 3-ols which are useful as diuretic agents.
This disclosure describes certain novel 3-(.alpha.-substituted-benzyl)-2,3-dihydrothiazolo[3,2-a][1,3]diazacyclan- 3-ols which are useful as diuretic agents.