Optically active N-heterocycles with four-, five-, or six-membered rings can be prepared from unsaturated secondary amines, by using a one-pot hydrozirconation/iodination sequence as the key step. The presented method allows the preparation of 2-substituted pyrrolidines enantiomeric to those previously obtained from N-allyloxazolidines. The two approaches use the same reagents (allyl bromide and aldehydes) and the same (R)-2-phenylglycinol as the chiral inductor.
[GRAPHICS]A new diastereoselective synthesis of pyrrolidines from readily available chiral N-allyl oxazolidines is presented. The construction of the pyrrolidine ring is achieved via a tandem hydrozirconation-stereoselective Lewis acid mediated cyclization sequence.
Scialdone Mark A., Meyers A. I., Tetrahedron Lett., 35 (1994) N 41, S 7533-7536
作者:Scialdone Mark A., Meyers A. I.
DOI:——
日期:——
A stereoselective concise synthesis of C2- and meso-aminodiols from (R)-phenylglycinol
作者:Mark A. Scialdone、A.I. Meyers
DOI:10.1016/s0040-4039(00)78336-5
日期:1994.10
Oxazolidines derivedfrom (R)-phenylglycinol can undergo diastereoselective vinyl- and aryl addition to give, after oxidative cleavage, meso- and C2-diethanol amines.