VAN, ELBURG P. A.;HONIG, G. W. N.;REINHOUDT, D. N., TETRAHEDRON LETT., 28,(1987) N 50, 6397-6400
作者:VAN, ELBURG P. A.、HONIG, G. W. N.、REINHOUDT, D. N.
DOI:——
日期:——
Chiral four-membered cyclic nitrones; asymmetric induction in the (4+2)-cycloaddition reaction of chiral ynamines and nitroalkenes
作者:P.A van Elburg、G.W.N Honig、D.N Reinhoudt
DOI:10.1016/s0040-4039(01)91385-1
日期:1987.1
Chiral four-membered cyclic nitrones were synthesized by the asymmetric (4+2)-cycloaddition of nitroalkenes 1 and chiral ynamines 2. The subsequent stereoselective addition of nucleophiles to these nitrones enabled the synthesis of chiral N-hydroxyazetidines.
Low-Energy Pathway for Pauson−Khand Reactions: Synthesis and Reactivity of Dicobalt Hexacarbonyl Complexes of Chiral Ynamines
作者:Jaume Balsells、Jordi Vázquez、Albert Moyano、Miquel A. Pericàs、Antoni Riera
DOI:10.1021/jo000278+
日期:2000.11.1
unstable terminal ynamine complexes 12a-f. The Pauson-Khandreaction of 12a-f with strained olefins (norbornadiene and norbornene) takes place at unprecedentedly low temperatures (-35 degrees C) in the absence of chemical promoters. Diastereoselectivities of up to 94:6 are recorded in these reactions with the ynamine complexes derivedfrom C(2) symmetrical chiral auxiliaries (12c,d). The high reactivity