Photochemical Wolff Rearrangement Initiated Generation and Subsequent α-Chlorination of C1 Ammonium Enolates
作者:David Weinzierl、Magdalena Piringer、Paul Zebrowski、Lotte Stockhammer、Mario Waser
DOI:10.1021/acs.orglett.3c00986
日期:2023.5.5
carboxylic acid esters with er up to 99:1 and yields up to 82% was achieved via a one-pot multistep protocol starting from α-diazoketones. This process proceeds via a photochemical Wolff rearrangement, trapping of the generated ketene with a chiral Lewis base catalyst, subsequent enantioselective α-chlorination, and a final nucleophilic displacement of the bound catalyst. The obtained products were successfully
从 α-重氮酮开始,通过一锅多步方案实现了对映选择性合成 α-氯化羧酸酯,其摩尔比高达 99:1,产率高达 82%。该过程通过光化学沃尔夫重排、用手性路易斯碱催化剂捕获生成的乙烯酮、随后的对映选择性α-氯化以及结合催化剂的最终亲核置换来进行。所得产物成功地用于与N-和S-亲核试剂的立体特异性亲核置换反应。