Synthesis of a Homologous Series of Side-Chain-Extended Orthogonally Protected Aminooxy-Containing Amino Acids
作者:Terrence Burke Jr.、Fa Liu、Joshua Thomas
DOI:10.1055/s-2008-1078600
日期:2008.8
Practical methodology is reported for the synthesis of a homologous series of sidechain extended amino acids containing aminooxy functionality bearing orthogonal protection suitable for Fmoc peptide synthesis. These reagents may be useful for the preparation of libraries containing fragments joined by peptide linkers.
Enantioselective synthesis of 3-substituted 1,2-oxazinanes via organocatalytic intramolecular aza-Michael addition
作者:Shuanghua Cheng、Shouyun Yu
DOI:10.1039/c4ob01646g
日期:——
A highly enantioselective intramolecular 6-exo-trig aza-Michael addition was developed to afford chiral 3-substituted 1,2-oxazinanes in high yields (up to 99% yield) and good enantioselectivities (up to 98/2 er). These reactions were enabled by a quinine-derived primary–tertiary diamine as a catalyst and pentafluoropropionic acid (PFP) as a co-catalyst.
reports the ring-closing metathesis reaction of bisolefins, including a reluctant fluoroalkenes, linked with oxaza moiety. The resulting heterocycles were produced in high yields under high diluting conditions disfavoring the homodimerization side reaction of nonfluorinated double bond. The use of a mixture of solvents proved to be a good strategy to obtain the fluorinated heterocycles in fair to excellent
Synthesis of Heterocycles Containingan N-O Bond by Ring-Closing Metathesis of Dienes Tetheredby Hydroxylamine
作者:Jinsung Tae、Young-Keun Yang
DOI:10.1055/s-2003-39319
日期:——
The dienes tethered by hydroxylamine were efficiently cyclized into 6- to 10-membered heterocycles containing an N-O bond by catalytic ring-closing metathesis.
通过催化闭环偏析,羟胺拴住的二烯烃被有效地环化成含有一个 N-O 键的 6 至 10 元杂环。
Ring-Closing Metathesis of Enynes Tethered by an N-O Bond: Synthesis of 1,2-Oxaza Polycycles by Diels-Alder Reaction of the Ring-Closing Metathesis Products
作者:Jinsung Tae、Young-Keun Yang
DOI:10.1055/s-2003-42038
日期:——
Ring-closingmetathesis (RCM) reaction of enynes tethered by an N-O bond produced 6- to 8-membered 1,2-oxaza heterocyclic compounds in high yields. Diels-Alder reaction of the cyclic 1,3-dienes with various dienophiles afforded bi- or tri-cyclic compounds efficiently.