Regioselective Reductive Hydration of Alkynes To Form Branched or Linear Alcohols
摘要:
The regioselective reductive hydration of terminal alkynes using two complementary dual catalytic systems is described. Branched or linear alcohols are obtained in 75-96% yield with >= 25:1 regioselectivity from the same starting materials. The method is compatible with terminal, di-, and trisubstituted alkenes. This reductive hydration constitutes a strategic surrogate to alkene oxyfunctionalization and may be of utility in multistep settings.
Direct chlorination of alcohols with chlorodimethylsilane catalyzed by a gallium trichloride/tartrate system under neutral conditions
作者:Makoto Yasuda、Kenji Shimizu、Satoshi Yamasaki、Akio Baba
DOI:10.1039/b804589e
日期:——
amount of GaCl(3)/diethyl tartrate to give the corresponding organic chlorides 3. In the catalytic cycle, the reaction of diethyl tartrate 4a with HSiMe(2)Cl 2 gives the chlorosilyl ether 5 with generation of H(2). Alcohol-exchange between the formed chlorosilyl ether 5 and the substrate alcohol 1 affords alkoxychlorosilane 6, which reacts with catalytic GaCl(3) to give the chlorinated product 3. The
[EN] MACROCYCLIC COMPOUND, PHARMACEUTICAL COMPOSITION, AND USE THEREOF<br/>[FR] COMPOSÉ MACROCYCLIQUE, COMPOSITION PHARMACEUTIQUE ET LEUR UTILISATION<br/>[ZH] 一种巨环化合物、药物组合物以及其用途