Decomposition of acylarylnitrosamines in benzene produces not only free radicals as is well recognized, but also intermediate ion pairs. The generality of this dual mechanism is experimentally demonstrated by use of nucleophilically activated fluorine as a ‘label’. The appearance of acylfluoride in the reaction products from fluorine substituted acylarylnitrosamines is interpreted.
The first a-alkylation of unactivated amides with primary alcohols is described. An effective and robust iridium pincer complex has been developed for selective alpha-alkylation of tertiary and secondary acetamides involving a "borrowing hydrogen" methodology. The method is compatible with alcohols bearing various functional groups. This presents a convenient and environmentally benign protocol for alpha-alkylation of amides.
A highly efficient catalytic α-alkylation of unactivated amides using primary alcohols
α-alkylation of unactivated amides with alcohols is described. Using a NCP-type pincer Ir complex as the precatalyst and KOtBu as the base, the reactions of secondary or tertiary acetamides with benzyl or nonbenzyl primary alcohols occur at 80 °C, furnishing the alkylation products in good yields. This method represents a practical and green means of α-alkylation of amides in a relatively mild, efficient
描述了未活化酰胺与醇的α-烷基化。使用NCP型夹钳Ir络合物作为前催化剂,并使用KO t Bu作为碱,仲或叔乙酰胺与苄基或非苄基伯醇的反应在80°C发生,提供了高收率的烷基化产物。该方法代表了以相对温和,有效和选择性的方式以低催化剂负载量(0.5mol%)进行酰胺的α-烷基化的实用和绿色手段。