Regio- and diastereo-selectivity of the insertion of aldehydes into alkyne zirconocene complexes
作者:Martin E. Maier、Thorsten Oost
DOI:10.1016/0022-328x(95)05587-2
日期:1995.12
aldehydes into alkyne-zirconocene complexes provides configurationally pureallyl alcohols in a one-pot procedure. In the case of unsymmetrical alkynes, the regioselectivity of the insertion process is high for terminal alkynes. With trimethylsilyl-substituted alkynes the regioseectivity is low. The insertion of chiral aldehydes into the symmetrical oct-4-yne-zirconocene complex provides the Cram isomer as
Hoffmann, Reinhard W.; Eichler, Guenter; Endesfelder, Andreas, Liebigs Annalen der Chemie, 1983, # 11, p. 2000 - 2007
作者:Hoffmann, Reinhard W.、Eichler, Guenter、Endesfelder, Andreas
DOI:——
日期:——
Regio- and stereoselective synthesis of isoxazolidine derivatives by asymmetric 1,3-dipolar cycloaddition reaction of chiral nitrones with 1-propene-1,3-sultone
作者:Hong-Kui Zhang、Wing-Hong Chan、Albert W. M. Leeb、Wai-Yeung Wong
DOI:10.1002/jhet.5570450402
日期:2008.7
Asymmetric 1,3-dipolar cycloadditions of chiral nitrones to 1-propene-1,3-sultone (1) were investigated. Chiral nitrones 6a-e reacted with sultone 1 in toluene at 90 °C for 24-36 h to give the corresponding isoxazolidines in moderate yields with high regioselectivities and stereoselectivities. The diastereoselectivity of this reaction varied with the choice of dipolarophile and the steric demands of