Synthesis of spiro[furan-3,3′-indolin]-2′-ones by PET-catalyzed [3+2] reactions of spiro[indoline-3,2′-oxiran]-2-ones with electron-rich olefins
作者:Lihong Wang、Zhanshan Li、Lianhong Lu、Wei Zhang
DOI:10.1016/j.tet.2011.12.018
日期:2012.2
An efficient procedure for the synthesis of spiro[furan-3,3′-indolin]-2-ones and dispiro[cycloalkane-1,2′-furan-3′,3″-indolin]-2″-ones has been achieved in high yields and stereoselectivity by photoinduced electron transfer-catalyzed [3+2] reactions of substituted spiro[indoline-3,2′-oxiran]-2-ones with olefins. The reactions proceed by ring opening of spiro[indoline-3,2′-oxiran]-2-ones via Cβ–O bond
合成了螺[呋喃-3,3'-吲哚啉] -2-酮和双螺[环烷烃-1,2'-呋喃-3',3”-吲哚啉] -2”-酮的有效方法通过取代的螺[吲哚啉-3,2'-环氧乙烷] -2-酮与烯烃的光诱导电子转移催化的[3 + 2]反应,可以高收率和立体选择性。该反应通过螺开环[二氢吲哚-3,2'-环氧乙烷] -2-酮通过C β -O键裂解和随后的环加成与烯烃通过使用2,4,6-三苯基吡喃鎓tetarfluoroborate(TPT)作为敏化剂。