synthesized and used in the copper(I)-catalyzed enatioselective [3 + 2] cycloaddition of iminoesters with alkenes. A variety of highly functionalized pyrrolidines were obtained in excellent yield and enatioselectivity. This is the first example of a pair of P-stereogenic ligands working as pseudoenantiomers to tune the enantio- and diastereoselective 1,3-dipolar cycloaddition, and providing a pair of
The preparation and reactions of stable phosphorus ylides derived from maleic anhydrides, maleimides or isomaleimides
作者:E. Hedaya、S. Theodoropulos
DOI:10.1016/0040-4020(68)88126-8
日期:1968.1
A number of stable triphenylphosphoranylidenesuccinimide derivatives have been prepared from maleimides or isomaleimides and triphenylphosphine. Also a stable ylide has been obtained from citraconic anhydride and triphenylphosphine. The succinimide ylides were found to react with a wide variety of aldehydes giving the corresponding ylidene derivatives in high yields. Although these triphenylphosphoranylidenes
Synthesis and chemistry of new spiro-Δ1-pyrazoline
作者:Nesrine Louhichi、Amel Houas、Naoufel Ben Hamadi、Moncef Msaddek
DOI:10.1002/jhet.827
日期:2012.3
spiroheterocycles, we found that the reaction of 2‐diazopropane with (E)‐α‐arylidenepyrrolin‐2‐one, (E)‐α‐arylidene‐γ‐butyrolactone, and (E)‐arylidene‐N‐arylsuccinimide derivatives produced spiro‐Δ1‐pyrazolines. The photolysis of Δ1‐pyrazolines has led to cyclopropanes. The structures of the obtained adducts have been assigned by means of spectroscopic measurements. J. Heterocyclic Chem., (2011).