Alcynylsilanes fonctionnels I. Synthèse régiospécifique par voie organozincique d'alcools homopropargyliques trialkylsilylés α′ - ou ω′-chlorés
作者:D. Mesnard、L. Miginiac
DOI:10.1016/0022-328x(90)80230-w
日期:1990.11
In many cases, the reaction between α- or ω-chloro carbonyl derivatives and organozincs prepared from halides R3SiCCCH2Br is chemo- and regioselective: it affords, in a good yield, trialkylsilyl homopropargylic alcohols α′- or ω′-substituted by a chlorine atom. This behaviour is different of this of organoaluminiums which lead mainly to trialkylsilyl α-allenyl α′- or ω′-chlorinated alcohols.
Facile protocol for the highly regioselective and stereodivergent synthesis of substituted bishomoallylic alcohols from esters
作者:Martin Oestreich、Fernando Sempere-Culler
DOI:10.1039/b315758j
日期:——
Regio- and diastereoselective preparation of bishomoallylic alcohols was realized by a facile four-step protocol including alpha,alpha'-selective zinc-mediated bispropargylation of unactivated esters and stereoselective reduction of the resulting bishomopropargylic alcohols.
Silanes in organic syuthesis. 11. Regiocontrolled synthesis of α-hydroxymethylated (trimethylsilyl)allenes
作者:Rhys G. Daniels、Leo A. Paquette
DOI:10.1016/s0040-4039(01)90382-x
日期:1981.1
The organometallic produced by reaction of trimethylsilylpropargyl bromide with aluminum amalgam in anhydrous tetrahydrofuran condenses readily with aldehydes and ketones to give allenic alcohols resulting from coupling α to the trimethylsilyl substituent.
Total Syntheses of Festuclavine, Pyroclavine, Costaclavine, <i>epi</i>-Costaclavine, Pibocin A, 9-Deacetoxyfumigaclavine C, Fumigaclavine G, and Dihydrosetoclavine
total synthesis of eight ergot alkaloids is reported. The approach allows the first total syntheses of pyroclavine, pibocin A, 9-deacetoxyfumigaclavine C, and fumigaclavine G and also enables the efficient synthesis of festuclavine, costaclavine, epi-costaclavine, and dihydrosetoclavine. The main feature of the synthesis is the use of an unprecedented Pd-catalyzed intramolecular Larockindole annulation/Tsuji–Trost
The diastereoselective synthesis of enantiopure homopropargylic amines by propargylation of various N-tert-butylsulfinylimines (tBS-imines) with 1-trimethylsilyl allenylzinc bromide is presented.