First total synthesis of (+)-apotrisporin E and (+)-apotrientriols A–B: a cyclization approach to apocarotenoids
摘要:
首次完成了天然类胡萝卜素 (+)-apotrisporin E (1) 和 (+)-apotrientriols A 和 B (2â3) 的全合成。其结构、相对立体化学和绝对构型的确定均已得到证实。这是一种快速、简便地获得该天然产物家族的方法,其关键步骤是非对映选择性环化和 HWE 烯化以连接二烯侧链。这项工作还为合成其他类胡萝卜素(如三孢子醇和三孢子酸)打开了大门。
Reinvestigation of Absolute Stereostructure of (-)-Rosiridol: Structures of Monoterpene Glycosides, Rosiridin, Rosiridosides A, B, and C, from Rhodiola sachalinensis
摘要:
从红景天的根中分离出了三种新的(-)-rosiridol苷,即rosiridosides A、B和C,以及rosiridin[(-)-rosiridol 1-O-β-D-吡喃葡萄糖苷]。在阐明这些新苷的结构过程中,重新研究了(-)-rosiridol 中 4-位的绝对构型。在对(-)-和(+)-rosiridol 衍生物应用改进的 Mosher 方法的基础上,(-)-rosiridol 中 4 位的绝对构型应从最近确定的 R 型修正为 S 型,从而确定了玫瑰苷 A、B 和 C 以及玫瑰苷的绝对立体结构。
First total synthesis of (+)-apotrisporin E and (+)-apotrientriols A–B: a cyclization approach to apocarotenoids
作者:José A. González-Delgado、Jesús F. Arteaga、M. Mar Herrador、Alejandro F. Barrero
DOI:10.1039/c3ob41226a
日期:——
The first total synthesis of the natural apocarotenoids (+)-apotrisporin E (1) and (+)-apotrientriols A and B (2â3) has been accomplished. The structure, relative stereochemistry and the assignation of the absolute configuration have been confirmed. This is a fast and easy access to this family of natural products whose key steps are a diastereoselective cyclization and a HWE olefination to attach the dienic side chain. This work also opens the door to the synthesis of other apocarotenoids such as trisporols and trisporic acids.
首次完成了天然类胡萝卜素 (+)-apotrisporin E (1) 和 (+)-apotrientriols A 和 B (2â3) 的全合成。其结构、相对立体化学和绝对构型的确定均已得到证实。这是一种快速、简便地获得该天然产物家族的方法,其关键步骤是非对映选择性环化和 HWE 烯化以连接二烯侧链。这项工作还为合成其他类胡萝卜素(如三孢子醇和三孢子酸)打开了大门。
Reinvestigation of Absolute Stereostructure of (-)-Rosiridol: Structures of Monoterpene Glycosides, Rosiridin, Rosiridosides A, B, and C, from Rhodiola sachalinensis
Three new (−)-rosiridol glycosides, rosiridosides A, B, and C, were isolated from the roots of Rhodiola sachalinensis together with rosiridin [(−)-rosiridol 1-O-β-D-glucopyranoside]. In the course of the structure elucidation of those new glycosides, the absolute configuration of the 4-position in (−)-rosiridol was reinvestigated. On the basis of the application of the modified Mosher's method for (−)- and (+)-rosiridol derivatives, the absolute configuration of the 4-position in (−)-rosiridol should be revised to be S orientation from the recently assigned R form, so that the absolute stereostructures of rosiridosides A, B, and C and rosiridin were determined.
从红景天的根中分离出了三种新的(-)-rosiridol苷,即rosiridosides A、B和C,以及rosiridin[(-)-rosiridol 1-O-β-D-吡喃葡萄糖苷]。在阐明这些新苷的结构过程中,重新研究了(-)-rosiridol 中 4-位的绝对构型。在对(-)-和(+)-rosiridol 衍生物应用改进的 Mosher 方法的基础上,(-)-rosiridol 中 4 位的绝对构型应从最近确定的 R 型修正为 S 型,从而确定了玫瑰苷 A、B 和 C 以及玫瑰苷的绝对立体结构。