The reaction of isocyanomethylenetriphenylphosphorane, generated in situ from the corresponding phosphonium salt, with a diverse set of aldehydes afforded vinyl isocyanides in good to high yields. Excellent E-selectivity was observed for aliphatic aldehydes and 2,6-disubstituted aromatic aldehydes, whereas Z-olefins were formed predominantly with ortho-substituted aryl aldehydes. (Z)-1-Bromo-2-(2-
Molecular and genetic basis for early stage structural diversifications in hapalindole-type alkaloid biogenesis
作者:Qin Zhu、Xinyu Liu
DOI:10.1039/c7cc00782e
日期:——
Heterologous expressions and purifications of all WelU proteins from the welwitindolinone pathways in Hapalosiphon welwitschii UTEX B1830 and IC-52-3 led to the discovery that WelU1 and WelU3 selectively assemble 12-epi-fischerindole...
attractive biosynthetic route and a mechanistically unexplored pathway in constructing a C═C bond. Using mechanistic probes, transient state kinetics, reactive intermediate trapping, spectroscopic characterizations, and product analysis, we propose that both IsnB and AmbI3 initiate stereoselective olefination via a benzylic C–H bond activation by an Fe(IV)–oxo intermediate, and the reaction likely proceeds
[EN] VINYL ISOCYANIDE COMPOUNDS AS ANTIBACTERIAL AGENTS<br/>[FR] COMPOSÉS DE VINYLE ISOCYANURE UTILISÉS EN TANT QU'AGENTS ANTIBACTÉRIENS
申请人:UNIV BATH
公开号:WO2022238694A1
公开(公告)日:2022-11-17
Compounds of formula (I) or formula (II) are disclosed: Wherein Y1, Y2, and Y3are independently selected from C-R1or N. Such compounds find use as antibiotics and antifungals.
Stereoselective Synthesis of (<i>E</i>)- and (<i>Z</i>)-Isocyanoalkenes
作者:Huan Tian、Caleb W. Holyoke、Fraser F. Fleming
DOI:10.1021/acs.orglett.2c03461
日期:2022.12.2
(E)- and (Z)-isocyanoalkenes were selectively synthesized via the sequential cross coupling of vinyl iodides with formamide, followed by dehydration. The optimal catalyst, generated in situ from CuII and trans-N,N′-dimethyl-1,2-cyclohexanediamine, rapidly coupled (E)- or (Z)-vinyl iodides with formamide, which minimized the isomerization of the resultant vinyl formamide. The method efficiently provided
( E )-和( Z )-异氰基烯烃是通过乙烯基碘与甲酰胺的顺序交叉偶联,然后脱水选择性合成的。最佳催化剂由 Cu II和反式-N,N'-二甲基-1,2-环己二胺原位生成,可将 ( E )-或 ( Z )-乙烯基碘与甲酰胺快速偶联,从而最大程度地减少生成物的异构化乙烯基甲酰胺。该方法有效地提供了一系列无环、碳环和杂环异氰基烯烃;非对映体异氰基抗生素 B371 和E -B371 的选择性立体发散合成说明了其多功能性。