Pd(II)-catalyzed intramolecularaminocarbonylation of olefins bearing many types of nitrogen nucleophiles has been examined under two typical conditions: acidic conditions [conditions A, typically PdCl(2) (0.1 equiv) and CuCl(2) (3.0 equiv) under 1 atm of CO at room temperature in methanol] and buffered conditions [conditions B, typically PdCl(2) (0.1 equiv) and CuCl(2) (2.3 equiv) under 1 atm of CO at
Cyclizations using Selenium Chemistry for Substituted 3-Hydroxypiperidines and 3-Hydroxypyrrolidines
作者:Matthew A. Cooper、A. David Ward
DOI:10.1071/ch11073
日期:——
the stereoselectivesynthesis of nitrogen heterocycles is of current interest because of increasing demands for the syntheses of biologically important alkaloids and related compounds. It is shown that selenium-induced cyclization of 4-hydroxy-5-pentenylamines occurs regio- and stereo-selectively to afford cis-3-hydroxy-2-phenylselenomethylpyrrolidines, whereas 5-hydroxy-6-hexenylamines cyclize and
Selenium induced stereoselective cyclization of N-protected 3-hydroxy-4-pentenylamines
作者:Matthew A. Cooper、A. David Ward
DOI:10.1016/s0040-4039(00)61110-3
日期:1992.9
The selenium induced cyclofunctionalization of N-protected 3-hydroxy-4-pentenylamine occurs regio- and steroselectively to give N-protected cis-2-(selenomethyl)-3-hydroxypyrrolidines in high yield. The rate of reaction and degree of stereoselectivity is shown to be dependent on the nature of the selenium reagent, reaction temperature and solvent.
Stereoselective Intramolecular Aminocarbonylation of 3-Hydroxypent-4-enylamides Catalyzed by Palladium
作者:Yoshinao Tamaru、Takuji Kobayashi、Shin-ichi Kawamura、Hirofumi Ochiai、Zen-ichi Yoshida
DOI:10.1016/s0040-4039(00)88935-2
日期:1985.1
The urethanes and tosamides of 3-Hydroxypent-4-enylamine and its C1 C4 substituted derivatives undergo the palladium catalyzed intramolecular aminocarbonylation (0.1 equiv of PdCl2, 3.0 equiv of CuCl2, 3.0 equiv of NaOAc in acetic acid under ca. 1 atm of CO) to give selectively cis 3-hydroxypyrrolidine 2-acetic acidlactone and its C2 C5 substituted derivatives in good yields (66 – 90%), respectively