Synthesis of Novel Functionalized 3-Spiropyrrolizidine and 3-Spiropyrrolidine Oxindoles from Baylis−Hillman Adducts of Isatin and Heteroaldehydes with Azomethine Ylides via [3+2]-Cycloaddition
A novel regioselective synthesis of a number of functionalized 3-spiropyrrolizidine and 3-spiropyrrolidine oxindoles fromBaylis-Hillmanadducts of isatin and heteroaldehydes via [3+2] cycloaddition of azomethine ylides in excellent yields has been reported.
Benzyl-Type Cation Initiated Nucleophilic Substitution on Furan and Thiophene by Using α-EWG Ketene S,S-Acetals as Nucleophiles
作者:Jun Liu、Mang Wang、Shaoguang Sun、Qun Liu
DOI:10.1055/s-0032-1316753
日期:2012.9
An efficient method for introducing nucleophiles on furan and thiophene has been established via the in situ formation of benzyl-type carbocation, delocalization of the carbocation on heterocyclic ring, and nucleophilic trap of alpha-EWG ketene S,S-acetal sequence at the 5-position.
Shanmugam, Ponnusamy; Madhavan, Suchithra; Viswambharan, Baby, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2008, vol. 47, # 7, p. 1113 - 1116