Diastereoselective Hydrogenation of Methyl 2-[α-(Methoxycarbonylamino)benzyl]acrylate Catalyzed by Ru(II) or Rh(I) Complexes
作者:Keiji Yamamoto、Masatoshi Takagi、Jiro Tsuji
DOI:10.1246/bcsj.61.319
日期:1988.1
The title compound was prepared and hydrogenated by using a Ru(II)- or Rh(I)-phosphine catalyst precursor with excellent anti-selectivity, the results indicating that a ligating group, NHCO2Me, may direct the addition of hydrogen to an olefinic diastereoface proximate to this group which binds the catalyst.
β-Lactams as Formal Dipoles through Amide-Bond Activation
作者:Vincent Barbier、Jérôme Marrot、François Couty、Olivier R. P. David
DOI:10.1002/ejoc.201501342
日期:2016.1
Activation of β-lactams can be achieved by simple Lewis-base catalysis to trigger an unprecedented reaction based on the formal dipolar behaviour of a strained amide bond. A new synthetic route for 1,3-oxazinan-6-ones is presented by reaction of β-lactams with ethylglyoxylate, which after methodological optimizations identified 4-pyrrolidinopyridine as the catalyst of choice in aprotic polar solvents
Synthesis of β‐Amino Acid Derivatives via Enantioselective Lewis Base Catalyzed N‐Allylation of Halogenated Amides with Morita‐Baylis‐Hillman Carbonates
作者:Olena Nosovska、Phil Liebing、Ivan Vilotijevic
DOI:10.1002/chem.202304014
日期:2024.3.7
Trifluoro- and trichloroacetamides serving as pronucleophiles undergo enantioselective Lewisbase catalyzed N-allylation with Morita-Baylis-Hillman carbonates to produce enantioenriched β-amino acid derivatives and highly enantioenriched allylic carbonates through a kinetic resolution. The obtained products are used to produce a library of spiro-isoxazoline lactams via deprotection - cyclization -