The Vinyl Moiety as a Handle for Regiocontrol in the Preparation of Unsymmetrical 2,3-Aliphatic-Substituted Indoles and Pyrroles
作者:Malcolm P. Huestis、Lina Chan、David R. Stuart、Keith Fagnou
DOI:10.1002/anie.201006381
日期:2011.2.7
enynes with N‐aryl ureas (X=NR2) and N‐vinylacetamides (X=C(O)Me), affording the corresponding 2‐alkenylindoles and 2‐alkenylpyrroles in good yield. Simple hydrogenation delivers the C2/C3‐aliphatic‐substituted indole or pyrrole (see scheme).
Rho-Rho-Rho您的小船:铑催化剂可实现烯炔与N-芳基脲(X = NR 2)和N-乙烯基乙酰胺(X = C(O)Me)的区域选择性氧化偶联,提供相应的2-烯基吲哚和2-烯基吡咯的收率好。简单的氢化作用即可得到C2 / C3脂肪族取代的吲哚或吡咯(参见方案)。
Synthesis of tetrasubstituted benzenes via rhodium(i)-catalysed ring-opening benzannulation of cyclobutenols with alkynes
作者:Takanori Matsuda、Norio Miura
DOI:10.1039/c3ob40436f
日期:——
A formal [4 + 2] annulation occurs between 1,3-disubstituted cyclobutenols and internal alkynes in the presence of rhodium(I) catalysts to afford 1,2,3,5-tetrasubstituted benzenes. These benzannulation products are generated through dehydration of the initially formed cyclohexadienols.
作者:Karen M. Miller、Torsak Luanphaisarnnont、Carmela Molinaro、Timothy F. Jamison
DOI:10.1021/ja0491735
日期:2004.4.1
epoxides, the conjugated alkene dramatically enhances reactivity and uniformly directsregioselectivity, independent of the nature of the other alkyne substituent (aryl, alkyl (1 degrees , 2 degrees , 3 degrees )) or the degree of alkene substitution (mono-, di-, tri-, and tetrasubstituted). These observations are best explained by a temporary interaction between the alkene and the transition metal
The reaction of various cyclic and acyclic alkynes with lithium dust (2% sodium) to form vicinal dilithioalkenes has been investigated: Aliphatic alkynes, e.g. 3-hexyne (27a), exclusively afford the corresponding (E)-dilithioalkenes, insoluble solids which are stable at room temperature and allow access to a variety of tetrasubstituted olefins in acceptable yields
Total synthesis of (±)-xanthocidin and (±)-desdihydroxy-4,5-dihydroxanthocidin
作者:Diane Boschelli、Amos B. Smith
DOI:10.1016/s0040-4039(01)82006-2
日期:1981.1
The first total synthesis of both (±)-xanthocidin (1), a novel α-methylene cyolopentanoid antibiotic, and (±)-desdihydroxy-4,5-dihydpoxanthocidin (2), the likely penultimate biosynthetic precursor is reported.