Studies towards the total synthesis of cruentaren A and B: Stereoselective synthesis of fragments C1-C11, C12-C22 and C23-C28
作者:Bogonda Ganganna、Pabbaraja Srihari、Jhillu Singh Yadav
DOI:10.1016/j.tetlet.2017.05.034
日期:2017.7
A convergent and stereoselective approach for the synthesis of C1-C11, C12-C22, and C23-C28 fragments of cytotoxic natural products cruentaren A and B are accomplished. Highlights of the strategy include a Sharpless epoxidation followed by a regioselective opening of epoxide to generate anti and syn-stereochemistry at C9-C10 and C15-C16, an Alder-Rickert reaction between a 1,5-dimethoxy-1,4-cyclohexadiene
实现了一种收敛和立体选择性的方法,用于合成细胞毒性天然产物Cruentaren A和B的C1-C11,C12-C22和C23-C28片段。战略的亮点包括夏普勒斯环氧化,接着环氧化物的区域选择性开口产生抗和顺式-立体化学在C9-C10和C15-C16,1,5-二甲氧基-1,4-环己二烯和之间的阿尔德-Rickert的反应亲二烯体以构建芳环,以及锂介导的羟醛反应以安装C17-C18抗立体化学。C1-C11和C12-C22片段的合成分别由市售的2-丁炔-1,4-二醇和顺-2-丁烯-1,4-二醇按照最长的10和17个步骤线性顺序进行。