An efficient enantioselective alkylation of N‐unprotected 3‐substitutedoxindoles was realized by using a chiral N,N′‐dioxide/scandium(III) complex as the catalyst. A wide range of 3,3‐dialkyl substitutedoxindoles with quaternary stereocenters were obtained in high yields and ee values (up to 98% yield and 99% ee).
A gold-catalyzed cascade reaction of skippeddiynes (1,4-diynes) and pyrroles has been developed. This reaction proceeds by the consecutive regioselective hydroarylation of two alkynes with a pyrrole, followed by a 7-endo-dig cyclization to give 1,6-dihydrocyclohepta[b]pyrroles in good yields. The direct synthesis of cyclohepta[b]indoles using indole nucleophiles has also been reported.
已经开发了金催化的二炔(1,4-二炔)和吡咯的级联反应。该反应通过用吡咯连续进行两个炔烃的区域选择性加氢芳基化反应,然后进行7-内-挖-环化得到高收率的1,6-二氢环庚[ b ]吡咯。也已经报道了使用吲哚亲核试剂直接合成环庚[ b ]吲哚。