Tandem Ireland−Claisen Rearrangement Ring-Closing Alkene Metathesis in the Construction of Bicyclic β-Lactam Carboxylic Esters
作者:Anthony G. M. Barrett、Mahmood Ahmed、Simon P. Baker、Simon P. D. Baugh、D. Christopher Braddock、Panayiotis A. Procopiou、Andrew J. P. White、David J. Williams
DOI:10.1021/jo991932s
日期:2000.6.1
toluenesulfonyl)- and (3S, 4R)-4-(2-propenyl)-3-¿(1R)-1-(tert-butyldimethylsilyloxy)ethyl-++ +azeti din-2-one were converted into beta-lactam dienes via sequential N-alkylation, Ireland-Claisenester enolate rearrangement and esterification. Ring-closing metathesis using the Schrock ¿(CF(3))(2)MeCO(2)Mo(=CHCMe(2)Ph)(=NC(6)H(3)-2,6-iso-Pr(2)) (1) or Grubbs Cl(2)(Cy(3)P)(2)Ru=CHPh (2) carbenes gave a