Total Synthesis of (±)-Goniomitine via a Formal Nitrile/Donor−Acceptor Cyclopropane [3 + 2] Cyclization
作者:Christian L. Morales、Brian L. Pagenkopf
DOI:10.1021/ol702376j
日期:2008.1.1
The totalsynthesis of (+/-)-goniomitine has been accomplished in 17 linear steps with 5.2% overall yield starting from commercially available delta-valerolactam. A synthetic highlight includes the first application of a formal [3 + 2] cycloaddition between a highly functionalized nitrile and a donor-acceptor cyclopropane to prepare an indole nucleus. The use of a microwave reactor is shown to greatly
Synthesis of 2,2‘-Bipyrroles and 2,2‘-Thienylpyrroles from Donor−Acceptor Cyclopropanes and 2-Cyanoheteroles
作者:Ming Yu、G. Dan Pantos、Jonathan L. Sessler、Brian L. Pagenkopf
DOI:10.1021/ol049857h
日期:2004.3.1
[reaction: see text] Two new series of 2,2'-bipyrroles and 2,2'-thienylpyrroles have been prepared by trimethylsilyl trifluoromethanesulfonate (TMSOTf)-mediated reaction of donor-acceptor cyclopropanes with 2-cyanopyrroles and 2-cyanothiophene, respectively. This method opens the door toward a wide variety of unsymmetrical bipyrroles and thienylpyrroles.
Synthesis of Indolizines and Benzoindolizines by Annulation of Donor-Acceptor Cyclopropanes with Electron-Deficient Pyridines and Quinolines
作者:Nicholas A. Morra、Christian L. Morales、Barbora Bajtos、Xin Wang、Hyosook Jang、Jian Wang、Ming Yu、Brian L. Pagenkopf
DOI:10.1002/adsc.200600298
日期:2006.11
The formal [3+2] dipolar cycloaddition (or annulation) of donor-acceptor cyclopropanoate esters with pyridines and 5-nitroquinoline is reported. Electron-deficientpyridine dipolarophiles (R=CN, CO2Et, COMe) participate in the annulation whereas electron rich species do not. The product 2,3-dihydroindolizines undergo rapid autooxidation, and the X-ray structures for two of the aromatic products are