Iron(II)-Catalyzed Chlorolactamization of γ,δ-Unsaturated Carboxylic Acids
作者:Thorsten Bach、Jan Kluegge、Eberhardt Herdtweck
DOI:10.1055/s-2004-825586
日期:——
A one-pot chlorolactamization of γ,δ-unsaturated carboxylic acids is presented. Substrates like carboxylic acid 1 were transformed into the acyl azides which upon treatment with FeCl2 and TMSCl in i-PrOH cyclized to yield lactams such as 2 (75% yield). The reaction yielded exclusively the syn-addition product as proven by the crystal structure of chlorolactam 2. The acyclic alkenoic acids 3-6 reacted equally well to the products 7-10 (57-81% yield). The reaction proceeded not stereospecifically but yielded a mixture of erythro- and threo-products.