Total Synthesis of (−)-Nodulisporic Acids D, C, and B: Evolution of a Unified Synthetic Strategy
作者:Yike Zou、Xiangqin Li、Yun Yang、Simon Berritt、Jason Melvin、Stephen Gonzales、Matthew Spafford、Amos B. Smith
DOI:10.1021/jacs.8b04053
日期:2018.8.1
A unified synthetic strategy leading to the total synthesis of (-)-nodulisporic acids D, C, and B is described. Key synthetic transformations include a nickel-chromium-mediated cyclization, an aromatic ring functionalization employing a novel copper-promoted alkylation, a palladium-catalyzed cross-coupling cascade/indole ring construction, and a palladium-mediated regio- and diastereoselective allylic
描述了导致 (-)-球孢酸 D、C 和 B 全合成的统一合成策略。关键的合成转化包括镍铬介导的环化、采用新型铜促进的烷基化的芳环官能化、钯催化的交叉偶联级联/吲哚环结构以及钯介导的区域和非对映选择性烯丙基取代/环化反应,后者构建环D。
Indole Diterpenoid Synthetic Studies. Construction of the Heptacyclic Core of (−)-Nodulisporic Acid D
作者:Amos B. Smith、Akin H. Davulcu、László Kürti
DOI:10.1021/ol0602912
日期:2006.4.1
of the heptacyclic core of (-)-nodulisporic acid D, a representative member of a recently discovered class of architecturally complex, ectoparasiticidal indolealkaloids, has been achieved. The modular synthetic strategy comprises an expedient, stereocontrolled synthesis of a tricyclic western hemisphere, in conjunction with union of an eastern hemisphere, exploiting the 2-substituted indole synthetic
作者:Yike Zou、Jason E. Melvin、Stephen S. Gonzales、Matthew J. Spafford、Amos B. Smith
DOI:10.1021/jacs.5b04728
日期:2015.6.10
A convergent total synthesis of the architecturally complex indole diterpenoid (-)-nodulisporic acidD has been achieved. Key synthetic transformations include vicinal difunctionalization of an advanced α,β-unsaturated aldehyde to form the E,F-trans-fused 5,6-ring system of the eastern hemisphere and a cascade cross-coupling/indolization protocol leading to the CDE multisubstituted indole core.
结构复杂的吲哚二萜 (-)-nodulisporic 酸 D 的收敛全合成已经实现。关键的合成转化包括先进的 α,β-不饱和醛的邻位双官能化以形成东半球的 E,F-反式融合 5,6-环系统和导致 CDE 多取代吲哚的级联交叉偶联/吲哚化方案核。
An Efficient Protocol for the Oxidative Hydrolysis of Ketone SAMP Hydrazones Employing SeO2 and H2O2 under Buffered (pH 7) Conditions
作者:Amos Smith、Zhuqing Liu、Vladimir Simov
DOI:10.1055/s-0029-1218352
日期:2009.12
An effective oxidative protocol for the liberation of ketones from SAMP hydrazones employing peroxyselenous acid under aqueous buffered conditions (pH 7) has been developed. The procedure proceeds without epimerization of adjacent stereocenters or dehydration, in representative SAMP alkylation and aldol reaction adducts, respectively.
Nodulisporic Acid A Synthetic Studies. 1. Overall Strategy and Construction of a Western Hemisphere Subtarget
作者:Amos B. Smith、Haruaki Ishiyama、Young Shin Cho、Kazuyuki Ohmoto
DOI:10.1021/ol0168871
日期:2001.11.1
[GRAPHICS]In this, the first of two Letters, we outline our overall strategy for the construction of (+)-nodulisporic acid A (1), a representative member of a new class of indole diterpenes. In addition, we describe the efficient assembly of (-)-6, an advanced western hemisphere subtarget, comprising the ABC rings of (+)-nodulisporic acid A (1). The synthesis proceeded in 9% overall yield (longest linear sequence, 11 steps), exploiting a Shibasaki-Mori tandem transmetalation-cyclization to construct ring B.