hate. A number of synthetic routes were explored for the preparation of these targets. The successful approach involved the synthesis of a protected C1–phosphonate ester 17 viaMichaelis–Arbuzovreaction, which was then hydrolysed and coupled with different amino acid esters using aldrithiol. Subsequent hydrogenolysis afforded the targets 2a–g, which were isolated as a mixture of diastereoisomers.
Applications of 5-<i>E</i><i>ndo</i>-trigonal Cyclization: Construction of Compounds Relevant to the Synthesis of Prostaglandins and Methyl <i>e</i><i>pi</i>-Jasmonate
作者:Mousumi Sannigrahi、Darrin L. Mayhew、Derrick L. J. Clive
DOI:10.1021/jo982225m
日期:1999.4.1
afford the highly substituted 1,2-oxasiloles 36. Again the major isomer had the ester and O-Si units in an anti relationship. Elaboration of 36 (major isomer) gave the Corey lactone derivative 7. A key intermediate (32) in this second sequence was also prepared in optically pure form by starting with 2-deoxy-D-ribose. Compound 19 was converted into 8, a sequence that constitutes a formal synthesis of methyl