In the presence of a catalytic amount of samariumdiiodide in methylene chloride, aromatic imines react with Danishefsky diene to form tetrahydropyridine-4-ones in high yields. Under the same conditions, various imino-aldol reactions afford β-amino esters or β-amino ketones.
Scandium triflate catalyzed cycloaddition of imines with 1,1-cyclopropanediesters: efficient and diastereoselective synthesis of multisubstituted pyrrolidines
作者:Yan-Biao Kang、Yong Tang、Xiu-Li Sun
DOI:10.1039/b512195g
日期:——
A tandem ring-opening–cyclization reaction of cyclopropanes with imines in the presence of 5 mol% of scandium triflate was developed for the highly diastereoselective synthesis of multisubstituted pyrrolidines.
Barbier-type allylation of unactivated aldimines with allyl bromides in the presence of indium powder took place rapidly in alcoholic solvents to give homoallylic amines in fair to good yields.
Phosphatase inhibitors—III. Benzylaminophosphonic acids as potent inhibitors of human prostatic acid phosphatase
作者:Scott A. Beers、Charles F. Schwender、Deborah A. Loughney、Elizabeth Malloy、Keith Demarest、Jerold Jordan
DOI:10.1016/0968-0896(96)00186-1
日期:1996.10
phenylphosphonic acid, and a rigid conformer produced by an internal salt bridge between the phosphonate and the alpha-amino group. Replacement of the phosphonic acid moiety with a phosphinic or carboxylic acid as well as deletion of the benzyl substitution of the alpha-amino group led to great reductions in potency.
An enantioselective Strecker synthesis employing novel chiral titaniumcomplex catalysts derived from structurally simple chiral N-salicyl-β-amino alcohols is described. Reactions of N-benzylidenebenzylamine with trimethylsilyl cyanide in the presence of the catalyst (10 mol%) gave the corresponding α-aminonitrile in good to excellent yields, along with relatively high enantioselectivity (up to 86%