Total synthesis of (+)-phorboxazole A, a potent cytostatic agent from the sponge Phorbas sp.
作者:Gerald Pattenden、Miguel A. González、Paul B. Little、David S. Millan、Alleyn T. Plowright、James A. Tornos、Tao Ye
DOI:10.1039/b308305e
日期:——
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
聚合分别由C(3-19),C(20-27)和C(33-46)片段5、4和91合成的佛波唑A(1a),集中于立体控制键的形成描述了C(2-3),C(19-20)和C(27-28)。尽管大环内酯与侧链取代的砜之间的偶联反应在C(27-28)上不成功,但是涉及恶烷甲基酮4和恶唑的Wadsworth-Emmons烯烃化反应产生了恶烷90,然后将其与91偶联。导致C(20-46)单元100。在C(19-20)处100与71c的进一步偶联最终导致105,并通过C(2)处105的大环化反应完成了合成-3)烯烃键,然后脱保护106。