divergolides 是结构上前所未有的 ansa 大环化合物家族。我们描述了一种针对 divergolides C 和 D 的合成策略,该策略取决于常见中间体的仿生多样化。介绍了一种先进的前体,它包含了 divergolide C 和 D 的所有碳原子,并研究了空间拥挤的酰基萘中的阻转异构现象。
Improved Zinc-Catalyzed Simmons–Smith Reaction: Access to Various 1,2,3-Trisubstituted Cyclopropanes
作者:Éric Lévesque、Sébastien R. Goudreau、André B. Charette
DOI:10.1021/ol500267w
日期:2014.3.7
The Simmons–Smith reaction of zinccarbenoids with alkenes is a powerful method to access cyclopropanes containing various substitution patterns. This work exploits the high reactivity of aryldiazomethanes toward zinc halides to generate aryl-substituted carbenoids catalytically. These carbenoids are able to cyclopropanate various alkenes diastereoselectively, including unfunctionalized substrates
Total Synthesis and Structural Reassignment of the γ-Lactone Polyketide from<i>Diaporthe</i>sp. SXZ-19
作者:Jhillu S. Yadav、Palash Dutta、Bogonda Ganganna、Eedubilli Srinivas
DOI:10.1002/ejoc.201500811
日期:2015.11
first stereoselective totalsynthesis of the proposed structure of the γ-lactone from Diaporthe sp. SXZ-19 was achieved by utilizing a convergent pathway. The four stereogenic centers were formed by employing Brown's asymmetric alkoxyallylboration reaction, and a cross-metathesis reaction was used to construct the trans double bond of the γ-lactone side chain. This synthesis led to a revision of proposed
An Aluminum Ate Base: Its Design, Structure, Function, and Reaction Mechanism
作者:Hiroshi Naka、Masanobu Uchiyama、Yotaro Matsumoto、Andrew E. H. Wheatley、Mary McPartlin、James V. Morey、Yoshinori Kondo
DOI:10.1021/ja064601n
日期:2007.2.1
base and aromatic, followed by deprotonative formation of the functionalized aromatic aluminum compound. Deprotonation by the TMP ligand rather than the isobutyl ligand was suggested and reasoned by means of spectroscopic and theoretical study. The remarkable regioselectivity of the ortho alumination reaction was explained by a coordinative approximation effect between the functional groups and the counter
Synthesis of ACE tricyclic systems of daphnicyclidin A and dehy-droxymacropodumine A
作者:Qi Wang、Chao Zhang、Jun Yang
DOI:10.1016/j.cclet.2019.12.018
日期:2020.7
Abstract The synthesis of the ACE tricyclic system of daphnicyclidin A and dehydroxymacropodumine A are developed. The key reactions include an efficient aldol reaction to introduce chiral fragment 33 for further construction of piperidine ring B and seven-membered ring C, a nucleophilic addition of lithium pentene to aldehyde for installation of ring E, and a photocatalytic decarboxylation conjugate
Total Synthesis of (+)-Calyculin A and (−)-Calyculin B: Asymmetric Synthesis of the C(9−25) Spiroketal Dipropionate Subunit
作者:Amos B. Smith、Gregory K. Friestad、Joseph Barbosa、Emmanuel Bertounesque、Kenneth G. Hull、Makoto Iwashima、Yuping Qiu、Brian A. Salvatore、P. Grant Spoors、James J.-W. Duan
DOI:10.1021/ja992134m
日期:1999.11.1
An asymmetricsynthesis of the stereochemically fully endowed C(9−25) spiroketal fragment (+)-BC of the calyculins (1−8) is described. Highlights of the synthesis include: a highly diastereoselective IBr-induced iodocarbonate cyclization to introduce the C(21) stereocenter in epoxide (+)-18, fragment unions exploiting the reaction of acyl anion equivalents with epoxides to construct masked advanced