α-Carboxy-β-Lactones from Photoinduced Ring Contraction of 3-Diazodihydrofuran-2,4-diones
作者:Rainer Schobert、Julia Beneke
DOI:10.1055/s-0032-1316860
日期:——
Abstract β-Lactones were prepared by irradiation of 3-diazodihydrofuran-2,4-diones via Wolff rearrangement proceeding with retention of the configuration of the migrating carbon atom. In the presence of alcohols or thiols, but not amines, the corresponding 3-(alkoxycarbonyl)- or 3-[(alkylsulfanyl)carbonyl]-β-lactones were obtained. 5-Alkyl-3-diazodihydrofuran-2,4-diones gave exclusively trans-3,4-disubstituted
摘要 β-内酯是通过沃尔夫夫重排辐射3-重氮二氢呋喃-2,4-二酮而制备的,同时保留了迁移的碳原子的构型。在醇或硫醇而不是胺的存在下,获得了相应的3-(烷氧羰基)-或3-[(烷基硫烷基)羰基]-β-内酯。5-烷基-3-重氮二氢呋喃-2,4-二酮仅产生反式-3,4-二取代的β-内酯。 β-内酯是通过沃尔夫夫重排辐射3-重氮二氢呋喃-2,4-二酮而制备的,同时保留了迁移的碳原子的构型。在醇或硫醇而不是胺的存在下,获得了相应的3-(烷氧羰基)-或3-[(烷基硫烷基)羰基]-β-内酯。5-烷基-3-重氮二氢呋喃-2,4-二酮仅产生反式-3,4-二取代的β-内酯。