Stereoselective Olefination Reactions Promoted by Rieke Manganese
作者:José Concellón、Humberto Rodríguez-Solla、Vicente del Amo、Pamela Díaz
DOI:10.1055/s-0029-1216880
日期:2009.8
applied to develop a novel and direct synthesis of (E)-α,β-unsaturated esters or amides and (Z)-α,β-unsaturated α-halo esters and α-choroamides through a Mn*-mediated sequential olefination protocol of aldehydes with dichloro esters or amides and trihalo esters or trichloroamides, respectively. manganese - elimination reactions - stereoselectivity - α,β-unsaturated esters - α,β-unsaturated amides - metalation
The Addition Reaction of Samarium Enolates and 2-Haloenolates Derived from Esters, and Amides to Imines. Totally Stereoselective Synthesis of Enantiopure 3,4-Diamino Esters or Amides
addition reaction of samarium enolates and 2-haloenolates derived from esters and amides to imines takes place in an efficient manner. A novel protocol to perform the addition reaction of samarium enolates derived from esters or amides to chiral 2-aminoimines, with total stereoselectivity and without racemization, is also reported. The use of samarium enolates in place of other classic metallic enolates
Transformations of N-ethylamines into amide derivatives under the action of sulfur monochloride
作者:L. S. Konstantinova、A. A. Berezin、O. A. Rakitin
DOI:10.1007/s11172-007-0179-9
日期:2007.6
Tertiary N-ethylamines were converted into amide derivatives by reactions with sulfurmonochloride and DABCO at 0 °C. Depending on the nature of the substituents in the amine, the reaction can be accompanied by unexpected transformations.
通过在 0 °C 下与一氯化硫和 DABCO 反应,将叔 N-乙胺转化为酰胺衍生物。根据胺中取代基的性质,该反应可能伴随着意想不到的转变。
Epoxysilane Rearrangement Induced by a Carbanion Generated by Conjugate Addition of Enolates of Chloroacetate and α-Chloroacetamides: Formation of Functionalized Cyclopropane Derivatives
moiety at the alpha-position with lithium enolate of 2-chloroacetamide afforded highly functionalized cyclopropane derivatives via a tandem process that involves Michael addition, ringopening of the epoxide, Brookrearrangement, and intramolecular alkylation.