Vinyl and Alkynyl Pyrimidines as Michael Acceptors: An Approach to a Cylindrospermopsin Substructure
作者:Jane F. Djung、David J. Hart、Erick R. R. Young
DOI:10.1021/jo000504f
日期:2000.9.1
base-mediated intramolecular conjugate addition reactions in which a carbamate and a urea, respectively, behave as nitrogen nucleophiles. The cyclic carbamatederivedfrom 9 was converted to 11 via a metalation-oxidation reaction in which 2-phenylsulfonyl-3-phenyloxaziridine behaves as a hydroxylation reagent. The cyclic ureaderivedfrom 24 was converted to cylindrospermopsin substructure 30 using dimethyldioxirane