Catalyst-controlled divergent intermolecularcycloadditions of vinylaziridines with alkynes have been developed. By using [Rh(NBD)2]BF4 as the catalyst, a [3 + 2] cycloaddition reaction was achieved with broad substrate scope and high stereoselectivity under mild reaction conditions. Moreover, the chirality of vinylaziridines can be completely transferred to the [3 + 2] cycloadducts. When the catalyst
A novel efficient and eco-friendly method for the synthesis of 2-trichloromethyl-4-vinyloxazoline is presented that involves Lewis acid-catalyzed cyclization of bisimidate derived from but-3-ene-1,2-diol. The derivatization potential of 2-trichloromethyl-4-vinyloxazoline is demonstrated by ring opening reactions with water, hydrobromic acid, hydrochloric acid, and acetic acid leading to allylamine
Diastereocontrolled synthesis of pyrrolidines by nickel promoted tandem cyclization-quenching of aminobromodienes
作者:Yolanda Cancho、Joan M. Martín、María Martínez、Amadeu Llebaria、Josep M. Moretó、Antonio Delgado
DOI:10.1016/s0040-4020(97)10220-4
日期:1998.2
aminobromodienes has been extended to the synthesis of 2,3,4-trisubstituted pyrrolidines. By a judicious choice of substituents on the starting aminohalodiene, the diastereoselectivity of the process can be efficiently controlled. When a chiral auxiliary on the nitrogen atom is used, enantiomerically enriched pyrrolidines can be obtained after removal of the auxiliary.