Utilizing the C4 reactive site of cyclopropyl ketones and a chiral N,N′-dioxide-scandium(III) complex as a catalyst, a concise ring-opening/cyclization/thio-Michael cascade method was developed for the synthesis of chiral benzothiazole derivatives from a simple 2-aminothiophenol material. The kinetic resolution and the origin of stereoselectivity were elucidated via a possible catalytic model.
Sc(OTf)3-catalyzed smooth tandem [3+2] cycloaddition/ring opening of donor–acceptor cyclopropane 1,1-diesters with enol silyl ethers
作者:Jie Fang、Jun Ren、Zhongwen Wang
DOI:10.1016/j.tetlet.2008.09.028
日期:2008.11
Catalyzed by Lewis acids, donor-acceptor cyclopropane 1,1-diesters reacted with enol silyl ethers to afford 1,6-dicarbonyl compounds in moderate to excellent yields. This supplied a mild carbon-carbon bond-forming method from the ring opening of cyclopropanes. A smooth tandem [3+2] cycloaddition/ring opening process has been clearly proved by an independent experiment. (C) 2008 Elsevier Ltd. All rights reserved.
S-Ethenylsulfoximine derivatives. Reagents for ethylenation of protic nucleophiles
作者:Carl R. Johnson、James P. Lockard、Eugene R. Kennedy
DOI:10.1021/jo01290a012
日期:1980.1
JOHNSON C. R.; LOCKARD J. P.; KENNEDY E. R., J. ORG. CHEM., 1980, 45, NO 2, 264-271
作者:JOHNSON C. R.、 LOCKARD J. P.、 KENNEDY E. R.
DOI:——
日期:——
Regiospecific Synthesis of Dihydropyrroles
作者:Denis Jacoby、Jean Pierre Celerier、Gjergi Haviari、Huguette Petit、Gérard Lhommet
DOI:10.1055/s-1992-26252
日期:——
A regiospecific synthesis of substituted dihydropyrroles is reported via nucleophilic homoallylic addition of activated cyclopropanes, followed by intramolecular ß-enamino ester formation.