A Cu‐catalyzeddiastereo‐ and enantioselective borylative coupling reaction of 1,3‐dienes with imines was realized. Branched homoallylic amines are readily prepared in a syn‐selective manner with high regio‐, diastereo‐ and enantioselectivity. Moreover, these three‐component coupling reactions feature good functional‐group compatibility and easy access to the substrates and catalyst.
syntheses of four stereoisomers of coronatine employing the exo-selectiveDiels–Alder reaction as a key step. Remarkable differences in stomatal opening activity were observed between enantiomers of coronatine. This result strongly suggests that the stereo structure of coronatine is very important for its stomatal opening activity. In addition, SAR studies suggested that coronatine operates as a molecular
Anomalous enantioselectivity in the Sharpless catalytic asymmetric dihydroxylation reaction of 1,1-disubstituted allyl alcohol derivatives
作者:Karl J. Hale、Soraya Manaviazar、S.Andrew Peak
DOI:10.1016/0040-4039(94)85071-2
日期:1994.1
The Sharpless asymmetric dihydroxylation (AD) reaction has been examined on a number of 1,1-disubstituted allyl alcohol derivatives. In the majority of substrates studied, the product diols had ee's in the 11–91% range and had absolute stereochemistry opposite to that predicted using the Sharpless stericmodel.
Synthetic studies on the azinothricin family of antibiotics. 2. Asymmetric synthesis of the C(28)–C(47) subunit of A83586C
作者:Karl J. Hale、Gurpreet S. Bhatia、S.Andrew Peak、Soraya Manaviazar
DOI:10.1016/s0040-4039(00)73993-1
日期:1993.8
An asymmetric synthesis of the C(28)-C(47) segment of the antitumour antibiotic A83586C is described.
Stereoselective Access to Fully Substituted Aldehyde‐Derived Silyl Enol Ethers by Iridium‐Catalyzed Alkene Isomerization
作者:Itai Massad、Heiko Sommer、Ilan Marek
DOI:10.1002/anie.202005058
日期:2020.9
An in situ generated cationic Ir‐catalyst isomerizes simple allylic silylethers into valuable, fully substituted aldehyde‐derived silylenolethers. Importantly, by judicious choice of substrate, either of the two possible stereoisomers of a given enolate derivative is accessible with complete stereoselectivity. One‐pot isomerization‐aldol and isomerization‐allylation processes illustrate the synthetic