Large-scale synthesis, design, and structure-activity relationships of khafrefungin are reported. Khafrefungin is an antifungal agent that inhibitsinositolphosphorylceramide (IPC) synthase, an enzyme involved in fungal sphingolipid biosynthesis. Unlike other inhibitors that inhibit the corresponding enzyme in fungi and mammals to the same extent, khafrefungin does not impair sphingolipid synthesis in mammals
Nickel-Catalyzed Decarboxylative Alkenylation of Anhydrides with Vinyl Triflates or Halides
作者:Hui Chen、Shuhao Sun、Xuebin Liao
DOI:10.1021/acs.orglett.9b01048
日期:2019.5.17
Decarboxylative cross-coupling of aliphatic acid anhydrides with vinyl triflates or halides was accomplished via nickel catalysis. This methodology works well with a broad array of substrates and features abundant functional group tolerance. Notably, our approach addresses the issue of safe and environmental installation of methyl or ethyl group into molecular scaffolds. The method possesses high chemoselectivity
Solvent-free, one-pot synthesis of <font>α</font>,<font>β</font>-unsaturated esters in the presence of a <i>C</i><sub>3</sub>-symmetric arsine
作者:Changqing Wang、Liu Yang、Rong Zhou、Guangquan Mei
DOI:10.1080/00397911.2016.1186698
日期:2016.6.17
ABSTRACT An efficient synthesis of α, β-unsaturated esters is achieved via a one-pot reaction in the presence of a C3-symmetric arsine. The key advantages are the short reaction time, simple workup, mild reaction conditions, and high yields. GRAPHICAL ABSTRACT
A One‐Pot Synthesis of
<i>α</i>
,
<i>β</i>
‐Unsaturated Esters From Esters
作者:Chang Whee Hong、Yong Jin Lee、Duk Keun An
DOI:10.1002/bkcs.12332
日期:2021.8
(HWE) olefination is described. The E-selective HWE homologation of various esters to α,β-unsaturatedesters was readily achieved and gave the desired products in good-to-moderate yields under mild conditions. The one-pot reaction proceeds through an in situ generated aldehyde, formed via the partial reduction of an ester with lithium diisobutyl-t-butoxyaluminum hydride. The formation of cyclized metal
The syntheses of four macrocyclic sperminealkaloids, (±)-budmunchiamine A – C (1a – c) and (±)-budmunchiamine L4 (1), were accomplished by Michael addition of spermine to the α,β-unsaturated esters 3a – d, followed by cyclization of the resulting α,ω-tetraamino esters 4a – d with triethoxyantimony; N-methylation of the amino lactams 6a – c yielded the budmunchiamines A – C (1a – c).
四种大环精胺生物碱 (±)-budmunchiamine A – C (1a – c) 和 (±)-budmunchiamine L4 (1) 的合成是通过 Michael 将精胺添加到 α,β-不饱和酯 3a – d 中完成的,然后用三乙氧基锑环化所得的 α,ω-四氨基酯 4a-d;氨基内酰胺 6a – c 的 N-甲基化产生 budmunchiamines A – C (1a – c)。