Allylation of Aldehydes and Imines: Promoted by Reuseable Polymer-Supported Sulfonamide of <i>N</i>-Glycine
作者:Gui-long Li、Gang Zhao
DOI:10.1021/ol0528235
日期:2006.2.1
[reaction: see text] A allylation of aldehydes and imines (generated in situ from aldehydes and amines) with allyltributyltin promoted by recoverable and reusable the polymer-supportedsulfonamide of N-glycine has been developed. Good to high yields were obtained in various cases. Most of the SnBu(3) residue can be recovered as Bu(3)SnCl. Highly stereoselective synthesis of N-Boc-(2S,3S)-3-hydroxy-2-phenylpiperidine
Cyclopropanation of tin-substituted acetals with olefinic alcohols via in situ transacetalization
作者:Masanobu Sugawara、Jun-ichi Yoshida
DOI:10.1016/s0040-4039(99)00035-0
日期:1999.2
Reactions of a tin-substituted acetal with olefinic alcohols in the presence of an acid resulted in facile transacetalization followed by intramolecular cyclopropanation to give the cyclized products in high yields and stereoselectivity.
efficiently undergo nucleophilic addition reactions with allylstannanes in the presence of GdCl3·6H2O in acetonitrile under extremely mild reaction conditions to give the corresponding homoallylic alcohols in excellent yields and with high chemoselectivity.
Cuprous iodide has been found to be a very effective catalyst for allylation of aldehydes with allyltributylstannane. The catalytic system efficiently promotes the allylation reaction in DMF to produce homoallylic alcohols in high yield.
Catalyzed by PdCl2, SnCl2 can efficiently mediate the allylation of various aldehydes with allyl chloride or bromide, but not with allyl alcohol, in fully aqueous media. The yield of the reaction is very high (90–100%), and the reaction is operationally simple, environmental benign and easy to scale up.