N‐phthalimidyl, benzamidyl, acetamidyl, carbamoyl, and ureayl derivatives of dihydropyridines and the application of these reagents as precursors for N‐centered radicals are presented. These aminated dihydropyridines could be used in radical‐transferhydroamination reactions of various electron‐rich as well as nonactivated olefins in the presence of thiols as polarity‐reversal catalysts. These reactions
Re<sub>2</sub>O<sub>7</sub>-catalyzed reaction of hemiacetals and aldehydes with <i>O</i>-, <i>S-,</i> and <i>C</i>-nucleophiles
作者:Wantanee Sittiwong、Michael W Richardson、Charles E Schiaffo、Thomas J Fisher、Patrick H Dussault
DOI:10.3762/bjoc.9.174
日期:——
monothioacetalization and allylation of hemiacetals. The reactions, which take place undermildconditions and at low catalyst loadings, can be conducted using hemiacetals, the corresponding O-silyl ethers, and, in some cases, the acetal dimers. Aldehydes react under similar conditions to furnish good yields of dithioacetals. Reactions of hemiacetals with nitrogen nucleophiles are unsuccessful. 1,2-Dioxolan-3-ols