265666-31-7Relevant academic research and scientific papers
A synthetic approach to the phorboxazoles – A strategy for the synthesis of the C1–C19 polyketide fragment
Leahy, James W.,Carroll, David C.,McElhone, Kate E.
, p. 117 - 120 (2018)
A synthetic approach to the C1–C19 polyketide fragment of the phorboxazoles is disclosed here. While an initial two-directional approach was efficient, it did not proceed in a high enough yield to justify moving forward. A subsequent successful strategy for the generation of the C11–C15 pyrans of both of the phorboxazoles was achieved, and the installation of the C9 stereocenter was able to be demonstrated. Furthermore, an efficient route for the preparation of the C1–C8 fragment with suitable functionality to allow for elaboration into the complete C1–C19 fragment, with the capricious C2–C3 Z-geometry installed, was also achieved.
Total synthesis of (+)-phorboxazole A, a potent cytostatic agent from the sponge Phorbas sp.
Pattenden, Gerald,Gonzalez, Miguel A,Little, Paul B,Millan, David S,Plowright, Alleyn T,Tornos, James A,Ye, Tao
, p. 4173 - 4208 (2007/10/03)
A convergent total synthesis of phorboxazole A (1a), from the C(3-19), C(20-27) and C(33-46) fragments 5, 4 and 91, respectively, concentrating on stereocontrolled formation of the bonds at C(2-3), C(19-20) and C(27-28), is described. Although a coupling reaction between a macrolide ketone and the side chain substituted sulfone, at C(27-28) was not successful, a Wadsworth-Emmons olefination involving the oxane methyl ketone 4 and an oxazole produced the oxane 90 which was next coupled to 91 leading to the C(20-46) unit 100. A further coupling of 100 to 71c at C(19-20) then led to 105, ultimately, and the synthesis was completed by a macrocyclisation reaction from 105, at the C(2-3) alkene bond, followed by deprotection of 106.
Synthetic studies towards phorboxazole A. Stereoselective synthesis of the C3-C19 bis-oxane oxazole portion of the phorboxazole macrolide
Pattenden, Gerald,Plowright, Alleyn T.
, p. 983 - 986 (2007/10/03)
A synthesis of the C3-C19 bis-oxane portion of phorboxazole A, involving an oxy anion intramolecular Michael reaction to produce a cis-oxane and an intramolecular Williamson reaction leading to a trans-oxane, is described. (C) 2000 Elsevier Science Ltd.
