Application of Allylzinc Reagents as Nucleophiles in Matteson Homologations
作者:Oliver Andler、Uli Kazmaier
DOI:10.1021/acs.orglett.1c03164
日期:2021.11.5
nucleophiles that can be used in Matteson homologations. The linear substitution products are formed almost exclusively, and excellent E selectivities are observed in reactions of reagents with sterically demanding or aryl substituents on the double bond. The allylated boronic esters obtained can be converted into trifluoroborates or subjected to further homologations. Ozonolysis of the double bond provides
New bridgehead-substituted 1-(arylsulfonyl)bicyclo[1.1.0]butanes and some novel addition reactions of the bicyclic system
作者:Yehiel Gaoni
DOI:10.1016/s0040-4020(01)80112-5
日期:1989.1
In view of planned syntheses of target cyclobutane derivatives, a series of new 3-substituted bicyclobutanes was prepared from sulfones 1–7. Some novel addition reactions involving the central bond were then applied to several of the new compounds as well as to some previously described bicyclobutanes. These reactions include the additions of hydrazoic acid, of cyanocuprate reagents other than methyl
Total synthesis of myxothiazols, novel bis-thiazole β-methoxyacrylate-based anti-fungal compounds from myxobacteria
作者:John M. Clough、Henry Dube、Bruce J. Martin、Gerald Pattenden、K. Srinivasa Reddy、Ian R. Waldron
DOI:10.1039/b603433k
日期:——
Convergent total syntheses of myxothiazols A and Z are described. The syntheses are based on elaboration of the (S)-E,E-diene thioamide 22, conversion of 22 into the bis-thiazole 27 and Wittig reactions between 27c and the aldehyde 30. The substituted beta-methoxyacrylate aldehyde 30 was produced via an Evans asymmetric aldol protocol or via the 2H-pyran-2-one 31. An E-selective Wittig reaction between
作者:Dorte Renneberg、Hanspeter Pfander、Christian J. Leumann
DOI:10.1021/jo005582h
日期:2000.12.1
The first totalsynthesis of optically active coraxeniolide-A (1a) and 4-epi-coraxeniolide-A (1b) is described. The approach is highly stereoselective and flexible in the preparation of a wide variety of members of the xeniolide family. The use of the Grob-fragmentation was pivotal for the stereospecificelaboration of the nine-membered ring. Coraxeniolide-A (1a) was synthesized in 28 steps by using
Expedient access to branched allylic silanes by copper-catalysed allylic substitution of linear allylic halides
作者:Devendra J. Vyas、Martin Oestreich
DOI:10.1039/b920793g
日期:——
An unprecedented copper-catalysed allylic transposition enables the regioselectivesynthesis of branched allylic silanes from linear allylichalides through direct C-Si bond formation.