A Catalyst Designed for the Enantioselective Construction of Methyl- and Alkyl-Substituted Tertiary Stereocenters
作者:Aurélie Claraz、Gokarneswar Sahoo、Dénes Berta、Ádám Madarász、Imre Pápai、Petri M. Pihko
DOI:10.1002/anie.201509302
日期:2016.1.11
identifying substituent effects on enantioselectivity, was designed. The catalytic process allows rapid access to chiral thioesters, amides, aldehydes, and ketones bearing an α‐methyl stereocenter with excellent enantioselectivities, and allowed rapid access to the C4–C13 segment of (−)‐bistramide A. DFT calculations rationalized the observed sense and level of enantioselectivity.
Thiosilanes such as ethylthiotrimethylsilane, hexamethyldisilthiane, and t-butylthiotrimethylsilane, react readily with acyl chlorides at room temperature in the presence of potassium fluoride to give the corresponding thioesters in excellent yields.
THE DIASTEREOSELECTIVE ADDITION OF TIN(II) ENOLATES DERIVED FROM CARBOXYLIC THIOESTERS TO α-IMINOESTER
作者:Teruaki Mukaiyama、Hiroshi Suzuki、Tohru Yamada
DOI:10.1246/cl.1986.915
日期:1986.6.5
The diastereoselective addition of the Sn(II) enolatesderivedfrom carboxylic thioesters to α-iminoester is described. The Sn(II) enolates of t-butylthiol esters react smoothly with α-iminoester to afford the corresponding β-aminoacid derivatives in good yield with high diastereoselectivity.
Further studies on the stereochemistry of metal enolate-imine condensation reactions
作者:Genji Iwasakia、Masakatsu Shibasaki
DOI:10.1016/s0040-4039(00)95486-8
日期:1987.1
Biscyclopentadienylchlorozirconium enolates derived from -butyl alkanethioates condensed with the imine 1 in a syn selective manner, while the diethylaluminum enolates derived from -butyl propanethioate and -butyl butanethioate reacted with 1 in an anti selective manner.