Synthetic studies towards (+)-Dihydroampullicin. Michael addition of N-Boc-2-(tert-butyldimethylsiloxy)-3-methyl-pyrrole to α-methylene lactones
作者:Isabel Marcos、Elena Redero、Francisco Bermejo
DOI:10.1016/s0040-4039(00)01499-4
日期:2000.10
N-(tert-butoxycarbonyl)-2-(tert-butyldimethylsiloxy)-3-methyl-pyrrole (4) to several α-methylene lactones catalyzed by fluoride ions yielded the corresponding homologated products (26–30) with good yields. Application of this reaction to the sililoxy bicyclic lactone (5) allowed us to isolate the tricyclic lactone (26), a highly valuable intermediate in our synthetic strategy leading to the growth
的迈克尔加成ñ - (叔丁氧羰基)-2-(叔甲基甲硅烷氧基)-3-甲基吡咯(4)由氟离子催化的几个α亚甲基内酯得到相应的同系化的产品(26 - 30)具有良好的产量。该反应在甲硅烷氧基双环内酯(5)上的应用使我们能够分离出三环内酯(26),这是我们合成策略中非常有价值的中间体,可导致生长调节剂(+)-二氢氨苄青霉素(1)。