Phorboxazole Synthetic Studies. 1. Construction of a C(3−19) Subtarget Exploiting an Extension of the Petasis−Ferrier Rearrangement
作者:Amos B. Smith、Patrick R. Verhoest、Kevin P. Minbiole、John J. Lim
DOI:10.1021/ol990830l
日期:1999.9.1
text] In this, the first of two letters, we outline our overall strategy for the total synthesis of phorboxazoles A (1) and B (2), rare oxazole-containing macrolides possessing extraordinary antimitotic activity, and describe the assembly of a C(3-19) subtarget (-)-5 for the total synthesis of phorboxazole A. The synthesis of (-)-5 was achieved in 15 linear steps (12% overall yield), exploiting a modification
[公式:参见文字]在此,两个字母的第一个,我们概述了总合成佛波唑A(1)和B(2),具有罕见抗有丝分裂活性的稀有含恶唑大环内酯的总体策略,并描述了组装过程C(3-19)子目标(-)-5的总合成佛波唑A。(-)-5的合成是通过15线性步骤(总产率为12%)实现的,利用了Petasis-进行载体重排以构建C(11-15)顺式四氢吡喃。事实证明,二甲基氯化铝(Me2AlCl)是Petasis-Ferrier重排的首选路易斯酸。