Total Synthesis of (+)-Trachyspic Acid 19-<i>n-</i>Butyl Ester
作者:Alex A. Rafaniello、Mark A. Rizzacasa
DOI:10.1021/acs.orglett.0c00319
日期:2020.3.6
The first total synthesis of the alkyl citrate trachyspic acid 19-n-butyl ester (1) is described. A formal [2 + 2]-cycloaddition of the silylketene acetal derived from lactone 6 with di-n-butylacetylene dicarboxylate 7 provided the cyclobutene diester 5 with a dr >20:1. Acid-mediated rearrangement of 5 followed by lactone ring-opening and ester protecting group manipulation eventually provided orthogonally
Enantiospecific synthesis of the heparanase inhibitor (+)-trachyspic acid and stereoisomers from a common precursor
作者:Steven C. Zammit、Vito Ferro、Edward Hammond、Mark A. Rizzacasa
DOI:10.1039/b708594j
日期:——
The total synthesis of natural (+)-trachyspic acid and its enantiomer is described starting from a common 2-deoxy-d-ribose derivative. The synthesis of the corresponding C3 epimers from the same starting material is also described. Each stereoisomer was assayed for heparanase inhibition.