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-Claisen ester 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
将4-烯基-2-氮杂环丁酮体系转化为相应的2-α4-烯基-2-氧代-1-氮杂环丁烷基-4-戊烯酸酯。另外,4-(2-丙烯基-1-氧基)-,4-(2-丙烯基-1-硫代)-,4-N-(2-丙烯基)-(4-甲苯磺酰基)-和(3S, 4R)-4-(2-丙烯基)-3-¿(1R)-1-(叔丁基二甲基甲硅烷氧基)乙基++ +氮杂环丁烷-2-酮经顺序的N-烷基化反应转化为β-内酰胺二烯-Claisen酯烯酸酯重排和酯化。使用Schrock(CF(3))(2)MeCO(2)Mo(= CHCMe(2)Ph)(= NC(6)H(3)-2,6-iso-Pr(2)进行闭环复分解))(1)或Grubbs Cl(2)(Cy(3)P)(2)Ru = CHPh(2)卡宾烯产生了一系列的5.2.0和6.2.0自行车。随后详细制备类似的(2R,7R,8S)-叔丁基8-(1R)-(叔丁基二甲基甲硅烷氧基)乙基-1-氮杂-9-氧代双环++